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.m 1mk a Place the watch glass flat on the table with a small piece of plasticine to fix it firmly to the bench at the one place it touches. Release the marble from one end of the watch glass and time 10 complete oscillations with a stop watch. Repeat these three times. Time for 10 oscillation Periodic time T s 1 2 3 2mks Find the average periodic time 2mk b Measure the diameter of the marble with vernier calipers and hence find its radius. Diameter . 1mk Radius r 1mk c Determine the volume of the marble given that V 2mks d Calculate the radius of curvature of the watch glass R from the formula R-r 2mks Where g 9.8m s2 , 3.142 e Determine the density of the marble 2mks www.freekcsepastpapers.comPage 243 PART B f Fix the plain sheet of paper on the soft board using some cello tape. Place the triangular prism on the paper and trace its outline on the sheet of paper. Remove the prism and use a ruler to extend the three side of the outline. Measure angle A and the length l A 1 mk l 1 mk NB: The plain sheet of paper must be submitted together with the question paper. G At a point about a third way along one side of the outline from angle A, draw a normal. H Draw a line at angle i 400 to the normal. Stick two pins P1 and P2 vertically on this line as shown below. Place the prism accurately on the outline. By viewing through the opposite side, stick two other pins P3 and P4 vertically such that they are in line with the two images of pins P1 and 2. Measure angle D i For two other values of angle I shown in the table 2 locate and measure the corresponding angles of deviation. |
A uniform meter rule pivoted at its 15cm mark is balanced by a 200g mass suspended at the 5cm mark. Determine the weight of the meter rule 3marks 5. A paper windmill in a horizontal axis was placed about a candle as shown in the figure. When the candle was lit the paper windmill began to rotate. Explain this observation. 2marks 6. An object was placed on an inverted bowl as shown. I State the type of stability above. 1mark ii Define the type stability above. 1mark www.freekcsepastpapers.com225 7. A pipe of diameter 12mm is connected to another pipe of radius 9mm. If water flows in the wider pipe at the speed of 2m s what is the speed in the narrow pipe. 3marks 8. A car starting from rest accelerates uniformly for 5minutes to reach 30m s. It continues at this speed for the next 20minutes and then decelerates uniformly to come to stop in 10 minutes. On the axes provided sketch the graph of velocity against time for the motion of the car 1mark 9. A diver was swimming in a swimming pool of uniform depth of 0.8m from the surface of water. If atmospheric pressure acting on the surface of water is 103000pa calculate the total pressure experienced by the diver. Density of water 1g cm3, g 10m s2 2marks 10. The boiling point of water is known to be at 100oC. A student heated some water and noticed that it boiled at 101oC state two possible reasons for this observation. 2marks 11. Explain the difference between a liquid and a gas in terms of intermolecular distance and force. 2marks 12. State the source of energy for gases in the atmosphere. 1mark SECTION B 55 MARKS 13. A Define the term velocity ratio of a machine 1mark b Figure below shows part of a hydraulic press. The plunger is the position where effort is applied while the ram piston is the position where load is applied. The plunger has a cross-section area a m2 while the ram piston has a cross-section area Am2. When the plunger moves down a distance d, the ram piston moves up a distance d. |
The plunger is the position where effort is applied while the ram piston is the position where load is applied. The plunger has a cross-section area a m2 while the ram piston has a cross-section area Am2. When the plunger moves down a distance d, the ram piston moves up a distance d. i State the property of liquid on which the working of the hydraulic press works 1mark ii Derive an expression for the velocity ratio V.R in terms of A and a 3marks c A machine of velocity ratio 45, overcome a load of 4.5 103N, When an effort of 135N is applied. Determine i The efficiency of the machine 3marks ii The percentage of work that goes to waste 1mark www.freekcsepastpapers.com226 14. A Define specific latent heat of fusion of a substance 1mark b Water of mass 200g at a temperature of 60oC is put in a well lagged copper calorimeter of mass 80g. A piece of ice at 0oC and mass 20g is placed in the calorimeter and the mixture stirred gently until all the ice melts. The final temperature T of the mixture is then recorded. Take; specific latent of fusion of ice 334000J kg, s.h.c of water 4200j kg 1k 1, s.h.c of copper 900J kg 1k 1 Determine: i The heat absorbed by the melting ice at 0oC 1mark ii The heat absorbed by the melted ice water to rise to temperature T. answer may be given in terms of T 2marks iii The heat lost by the warm water and the colorimeter answer may be given in terms of T 2marks iv The final temperature of the mixture 3marks 15. A State Newton s second law of motion 1mark b A matatu starts from rest and accelerates to cover a distance of 49m in 7seconds. Determine its acceleration. 2mks c A trolley moving on a horizontal bench of height 1.2m strikes a barrier at the edge of the bench. |
The figure below shows a ray of light incident on a glass prism. Given that the critical angle of the glass is 390, sketch on the diagram the path of ray through the prism until it exits the prism 2mks 6. A sharp point of a pin is held over a positively charged electroscope. State and explain the observation made on the electroscope 2mks www.freekcsepastpapers.com229 7. The figure below is a circuit of 3 resistors connected to a 12v battery. Determine the P.d across the 3 resistor 3mks 8. The figure below shows a magnet. Point A and B are in front of the magnet. On the axis provided sketch a graph showing how the magnetic field strength changes the A to B 2mks 9. The figure below shows a beam of beta particles entering a magnetic field whose direction below. Complete the diagram to show the path of the beta particles as they pass through magnetic field and out of it 1mk 10. A girl standing 400m from the foot of a high cliff claps her hand and the echo reaches her 2.32 seconds later. Calculate the velocity of sound in air using this observation. 2mks 11. Explain two of ways of dealing with defect of polarisation in a simple cell 2mks 12. The figure below shows an a.c source connected across diode D and Resistor R. Distance Magnetic field strength Magnetic fields Beam of beta particleswww.freekcsepastpapers.com230 On the axis provided sketch the output voltage as observed in the CRO 1mk SECTION B 55 MARKS 13. A The figure below shows a system of capacitor connected to a 100v d.c supply. From this circuit determine: i Its effective capacitance 2mks ii The charge through the F 6capacitor 2mks iii The p.d across F 8capacitor 2mks b State any two factors that affects the capacitance of a parallel plate capacitor 2mks 14. |
Distance Magnetic field strength Magnetic fields Beam of beta particleswww.freekcsepastpapers.com230 On the axis provided sketch the output voltage as observed in the CRO 1mk SECTION B 55 MARKS 13. A The figure below shows a system of capacitor connected to a 100v d.c supply. From this circuit determine: i Its effective capacitance 2mks ii The charge through the F 6capacitor 2mks iii The p.d across F 8capacitor 2mks b State any two factors that affects the capacitance of a parallel plate capacitor 2mks 14. A The figure below shows the features of an x-ray tube i Name the parts labelled A and B 2mks ii Explain the effect of increasing the potential P on x-rays produced 2mks iii During the operation of the tube, the target become very hot. Explain how this heat is caused 2mks b In a certain x-ray tube, the electrons are accelerated by a p.d of 12kv. Assuming that all energy goes to produce x-rays, determine the frequency of x-ray produced h 6.62 10-34Js and e- 1.6 10-19C 3mks Time s Pd V www.freekcsepastpapers.com231 15. The figure below shows a connection to a 3-pin plug as viewed from its back i Name the terminal pin labelled A 1mk ii State any two mistakes with wiring of his 3pin plug 2mks iii Give any two reasons why the earth pin is normally longer than the other two pins 2mks b The figure below is graph of K.E of electrons against frequency of radiation in photo electric effect in cathode metal plate From the graph, determine i Threshold wavelength of the cathode metal surface 2mks ii Planck s constant h of cathode 2mks iii Work function of cathode in ev 2mks 16. |
Explain how this heat is caused 2mks b In a certain x-ray tube, the electrons are accelerated by a p.d of 12kv. Assuming that all energy goes to produce x-rays, determine the frequency of x-ray produced h 6.62 10-34Js and e- 1.6 10-19C 3mks Time s Pd V www.freekcsepastpapers.com231 15. The figure below shows a connection to a 3-pin plug as viewed from its back i Name the terminal pin labelled A 1mk ii State any two mistakes with wiring of his 3pin plug 2mks iii Give any two reasons why the earth pin is normally longer than the other two pins 2mks b The figure below is graph of K.E of electrons against frequency of radiation in photo electric effect in cathode metal plate From the graph, determine i Threshold wavelength of the cathode metal surface 2mks ii Planck s constant h of cathode 2mks iii Work function of cathode in ev 2mks 16. A The figure below shows a simple cathode ray tube i Explain how the electrons are produced in the tube 2mks ii State one function of the anode 1mk www.freekcsepastpapers.com232 iii At what part of the cathode tube would the time base be connected? 1mk b The figure below represents a displacement time graph for a wave moving with a velocity of 80cm s Determine the wave i Frequency f 2mks ii Wavelength 2mks c A ray of light traveling through air in to medium 1 and 2 as shown in the figure below. I Calculate the refractive index of medium 1 1mk ii Angle of refraction r2 in medium 2 2mks 17. A State the Lenz s law of electromagnetic induction. 1mk b A bar magnet is moved into a coil of insulated copper wires connected to a centre zero galvanometer G as shown in the figure below. |
I Calculate the refractive index of medium 1 1mk ii Angle of refraction r2 in medium 2 2mks 17. A State the Lenz s law of electromagnetic induction. 1mk b A bar magnet is moved into a coil of insulated copper wires connected to a centre zero galvanometer G as shown in the figure below. I With arrows show the direction of induced current in the coil 1mk ii Explain clearly what is observed on the galvanometer when the south pole of a magnet is moved into the coil and then withdrawn 2mks c A transformer has 1600 turns in the primary coil and 80 turns in the secondary coil. If the transformer is 80 efficient and its primary coil is 240v with a current of 0.75A, determine i The secondary e.m.f of its coil 2mks ii The output power in its secondary coil 2mks www.freekcsepastpapers.com233 18. A Define the term radioactivity 1mk b The figure below shows tracks formed in a diffusion cloud chamber given by a certain radioactivity sample State the type of radiations emitted by this sample, explain your answer 2mks c i The figure below shows radioactive decay of iodine. Ii What fraction of this iodine will have decayed after 3 half lifes 2mks d The average count rate of a radioactive material sample is 92 counts per second. After 420 seconds, the count rate had dropped to 29 counts per second. Given that the background count rate was 20 counts per second, determine the half-life of this sample. 3mks www.freekcsepastpapers.com224 CEKENA MOCK EXAMINATIONS, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS Paper 3 CONFIDENTIAL 1. -. Two biconcave lenses 1st and 2nd f 10cm - Two lens holder - A white screen, I with cross wire - A white screen, II without cross wire - A meter rule - A plane mirror with surface area of the lens - A piece of cellotape - A lit candle source of light 2. |
Given that the background count rate was 20 counts per second, determine the half-life of this sample. 3mks www.freekcsepastpapers.com224 CEKENA MOCK EXAMINATIONS, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS Paper 3 CONFIDENTIAL 1. -. Two biconcave lenses 1st and 2nd f 10cm - Two lens holder - A white screen, I with cross wire - A white screen, II without cross wire - A meter rule - A plane mirror with surface area of the lens - A piece of cellotape - A lit candle source of light 2. A Voltmeter Ammeter 0 -1 A Switch 2 dry cells Cell holder Resistor R 10 Nichrome wire 0.3 0.02mm 7 connecting wire Micrometer screw gauge to be shared B Measuring cylinder at least 40cm Glycerine to fill the cylinder to 37cm Two rubber bands Tissue paper One ball bearing diameter 6mm 1 A magnet any permanent magnet A micrometer screw gauge A stop watch digital www.freekcsepastpapers.com225 CEKENA MOCK EXAMINATIONS, 2023 Kenya Certificate of Secondary Education K.C.S.E 231 3 PHYSICS PAPER 3 PRACTICAL TIME: 2 hours a Answer all questions b You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for clear record of the observation made, their suitability accuracy and the use made of them. D Candidates are advised to record their observation as soon as they are made. E Non-programmable silent calculators and mathematical tables may be used. 1 You are provided with the following: a Two biconcave lenses, b Two lens holders c Lit candle d White screen, I with cross-wire e White screen II f A meter rule g A plane mirror h Cellotape Procedure i Mount 1st lens in the lens holder. Fix the plane mirror at the back of the lens using cellotape ii Arrange the setup as shown in figure below. |
1 mark 3. Figure 2 shows some air trapped by mercury in a glass tube. The tube is inverted in a dish containing mercury. Given that the atmospheric pressure is 760 mmHg and the height of mercury column in the tube is 600 mm, determine the pressure of the air trapped in the tube in mmHg. 2 marks 4. Figure 3 shows drops of mercury and water on two glass beakers, Explain the difference in the shapes of the drops. 2marks Mercury droplet Water droplet 5. A ball is thrown from the top of a cliff 20m high with a horizontal velocity of 10ms-1. Calculate the distance from the foot of the cliff to where the ball strikes the ground. 3 marks b a Inside jaws Vernier scale Object Outside jaws Main scale Stripwww.freekcsepastpapers.comPage 209 6. Explain why a clinical thermometer is not sterilized using boiling water. 1mark 7. A boy blows through the mouth of a hollow vuvuzela as shown below. A light cork is suspended freely by a string as shown. Giving reason indicate the path taken by the cork 2 marks 8. A stopwatch reads 08:10:84 and 09:10: 90 before and after an experiment respectively. Determine the duration of the event in SI units. 2marks 9. Explain the meaning of thermodynamics as a branch of physics. 1 mark 10. A metal ball suspended vertically with a light string of length 4m is displaced through an angle as shown in the diagram below. The body is released from A and swings past the lowest point B. Given that its velocity at point B is 4 m s, determine angle 3 marks 11. Figure 5 shows a rectangular loop with a thin thread loosely tied and dipped into a soap solution. Draw on the space provided what is observed when point A is punctured. 1mark 12. Two horizontal strings are attached to a block, resting on a frictionless surface, as shown in figure 6. A force of 100N pulls on one string. The block does not move. Find the value of the force, F on the other string. 1 mark 13. A wooden bench feels neither warm nor cold when touched by your bare hands. Explain this observation. |
Determine the temperature of the gas when the pressure increases to 900mmHg and the volume decreases to 15 cm3. 3 marks 18. A Define the term velocity ratio of a machine 1 mark b The figure 11, below shows part of the hydraulic lift system. State any one property of the liquid under which the hydraulic system works 1 mark c The hydraulic lift machine above has velocity ratio 45 and it overcomes a load of 4500 N when an effort of 135 N is applied. Determine: i The mechanical advantage of the machine 2 marks ii Efficiency of the machine 3 marks iii The percentage of work that goes to waste 1 mark www.freekcsepastpapers.comPage 212 KAKAMEGA FORM IV JOINT EXAMINATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 Time 2 hours INSTRUCTIONS TO CANDIDATES. Answer ALL the questions. ALL working must be clearly shown. Non-programmable silent electronic calculators and KNEC mathematical table may be used SECTION A 25 MKS 1. State two differences between images formed by a plane mirror and a pinhole camera. 2mks 2. You are provided with connecting wires, 2 dry cells, a switch and two bulbs. Draw a circuit diagram to show; cells in parallel and controlled by one switch. 2mks 3. When an ebonite rod is rubbed using dry cloth it acquires negative charge. Explain how the negative charge is acquired 1mk 4. The diagram below shows a soft iron bar placed when poles of a magnet. Draw the magnetic field pattern produced. 2mks 5. The diagram below shows a conductor in a magnetic field Indicate on the diagram the direction of motion 1mk 6. State two applications of total internal reflection 2mks 7. You are provided with resistors 3.052, 4.052 and 6.052. Draw a circuit diagram to show how the three resistors can be connected together to give an effective resistance of 652. 2mks 8. The diagram below shows plane waves moving from shallow to deep end of a pond. |
Draw a circuit diagram to show how the three resistors can be connected together to give an effective resistance of 652. 2mks 8. The diagram below shows plane waves moving from shallow to deep end of a pond. Shallow water Deep water a Complete the diagram to show the waves on the deep end 1mk b State what happens at the boundary to i The frequency of the waves 1mk ii The speed of the waves 1mk www.freekcsepastpapers.comPage 213 9. The figure below shows a simple cell. A When switch K is closed, the bulb lights brightly initially, but grow dim and dimmer until it goes off; i State the possible cause of this behaviour. 1mk ii State the remedy for the behaviour 1mk 10. The diagram below shows a wave profile Determine the frequency of the wave 3mks 11. State two ways of increasing the capacitance of a parallel plate capacitor 2mks 12. A driver was given tow mirrors-a plane mirror to choose from. He chose convex mirror as his driving mirror. Give two reasons why? 2mks SECTION B 55 MKS 13. A State Snell s law of refraction 1mk b In an experiment to determine the refractive index of a liquid, the liquid was poured into a measuring cylinder, a pin was placed at the bottom of the cylinder and another pin used to locate the apparent position of the first pin. The values of real and apparent depth were used to plot a graph as shown below. Real depth cm Apparent depth cm www.freekcsepastpapers.comPage 214 i From the graph determine the refractive index of the liquid 3mks ii Given that the velocity of light in vacuum is 30x 108m s, what would be the velocity of light in the liquid above? |
A State Snell s law of refraction 1mk b In an experiment to determine the refractive index of a liquid, the liquid was poured into a measuring cylinder, a pin was placed at the bottom of the cylinder and another pin used to locate the apparent position of the first pin. The values of real and apparent depth were used to plot a graph as shown below. Real depth cm Apparent depth cm www.freekcsepastpapers.comPage 214 i From the graph determine the refractive index of the liquid 3mks ii Given that the velocity of light in vacuum is 30x 108m s, what would be the velocity of light in the liquid above? 2mks c The diagram below shows a ray of light incident on a glass-air interface Given that the refractive index of glass is 1.4, determine the value of 3mks d State two condition necessary for internal reflection to occur 2mks e The diagram below shows a ray of light incident at glass prism ABC at 90o Complete the ray to show how it emerges from the prism given the critical angle of the glass is 42o 14. A What is meant by the term capacitance? 1mk b The figure below shows a point placed near a positively charged rod. Draw on the diagram the resulting electric field patterns c When a positively charged conductor is brought close to a candle, the flame is diverted as shown in the figure below. Explain this observation 2mks www.freekcsepastpapers.comPage 215 d The figure below shows three capacitors of capacitance 3 F, 2MF and 6 F connected to a 12V supply circuit. Calculate: i The total capacitance of the circuit 3mks ii The total stored in the circuit 3mks iii The potential differences across 2 F capacitor 2mks 15. A Define principal focus of a biconcave lens 1mk b The diagram below shows a virtual image of an object placed in front of a biconvex lens. Draw appropriate rays to locate the object. C A convex lens forms a real image five times the size of the object on a screen. |
A Define principal focus of a biconcave lens 1mk b The diagram below shows a virtual image of an object placed in front of a biconvex lens. Draw appropriate rays to locate the object. C A convex lens forms a real image five times the size of the object on a screen. If the distance between the object and the screen is 120Cm, determine; i image distance 2mk ii Focal length of the lens 2mks d The diagram below shows a defect in human eye. I Name the defect 1mk ii State two causes of the defect 2mks 16. A figure below shows how a student set up and circuit using three identical bulbs x, y and z each rated 12V, 2.0A www.freekcsepastpapers.comPage 216 i When operating normally, calculate the resistance of one of the bulbs 2mks ii Calculate the effective resistance of the three bulbs 2mks iii What will be reading of the ammeter? 2mks iv Draw a circuit diagram showing the three bulbs connected in such a way that they would all work at the same brightness especially if they are not identical 2mks b When the switch S is kept open in the circuit shown below the voltmeter reads 1.5V. When the switch is closed, the reading drops to 1.3V and the current through the resistor is 0.5A. i What is the e.m.f of the cell? 1mk ii What is the terminal voltage of the cell 1mk iii Calculate the value of R 2mks 17. In the experiment to observe interference of light waves a double slit is place close to the source of monochromatic light as shown below. |
I What is the e.m.f of the cell? 1mk ii What is the terminal voltage of the cell 1mk iii Calculate the value of R 2mks 17. In the experiment to observe interference of light waves a double slit is place close to the source of monochromatic light as shown below. A i State the function of the double slit 1mk ii State and explain what is observed on the screen 3mks b State what is observed on the screen when: i The slit separation S1S2 is reduce 1mk ii White light source is used in place of monochromatic source 1mk c Distinguish between stationary waves and progressive waves in terms of their Propagation 1mk www.freekcsepastpapers.comPage 217 KAKAMEGA FORM IV JOINT EXAMINATION, 2023 Kenya Certificate of Secondary Education 232 3 PHYSICS Paper 3 PRACTICAL 2 hours INSTRUCTIONS Answer all questions. You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully. Marks are given for a clear record of the observation actually made, their suitability, accuracy and the use made of them. Candidates are advised to record their observations as soon as they are made. Mathematical tables, slide rules and calculators may be used. Take 3.14 and gravitational acceleration g 10m s2 Question 1 You are provided with the following: - An ammeter - A voltmeter - A switch - A cell holder and two dry cells. -. A wire mounted on a mm labeled AB. -. Six connecting wires, at least three with crocodile clips. A Set up the apparatus as shown in the circuit diagram below in figure 2. Figure 2 Close the switch, using the voltmeter and ammeter measure the voltage and current when the distance L is approximately 100cm. |
1 mark ii Measure and record the distance x between the two lenses and the distance y between the concave lens and the screen. 2 marks x . Y . I Find the focal length f of the diverging lens using the relationship, 3 marks www.freekcsepastpapers.comPage 220 KAKAMEGA FORM IV JOINT EXAMINATION, 2023 Kenya Certificate of Secondary Education 232 3 PHYSICS Paper 3 PRACTICAL CONFIDENTIAL Question 1 You are provided with the following: - An ammeter 0 1A - A voltmeter 0 3V - A switch - A cell holder and two dry cells. -. A nichrome wire swg 28 diameter 0.37mm mounted on a mm labeled AB to a length of 1m. - Six connecting wires, at least three with crocodile clips. Question 2 Each student to be provided with the following; Spring balance 100g mass labeled Solid A Water in a 100ml beaker About 100ml of glycerin in a 100ml beaker labeled Liquid L. Sewing thread about 20 cm Piece of tissue paper A convex lens of focal length 15cm and a lens holder A concave lens of focal length 15 and a lens holder A screen A meter rule A cross wire object A lit candlewww.freekcsepastpapers.comPage 191 MUMIAS WEST JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education 232 1 Physics Paper 1 Time: 2hours Instructions to the candidates; Answer ALL the questions in sections A and B ALL working MUST be clearly shown. KNEC Mathematical tables and Non-programmable electronic calculators may be used. Take; g 10N kg SECTION A 25 MARKS 1. State two precautions to be observed when using a micrometer screw gauge. 2marks 2. The formula for determining weight of an object is given by w mg. Give the physical quantity represented by the letter g and state its S.I unit. 2marks 3. Figure 1 shows water in a tank. |
Give the physical quantity represented by the letter g and state its S.I unit. 2marks 3. Figure 1 shows water in a tank. Determine the pressure exerted on the ground due the weight of the water. 3marks Take density of water to be 1000 kgm-3 4. A part from size of molecule, State two other factor that affect the rate of diffusion of a gas. 2marks 5. Figure 2 shows electric cables for power transmission. Explain why they are not fixed tightly. 2marks 6. A half-filled thermos flask is less likely to keep a liquid hot for a longer time than one which is completely filled. Explain. 2marks 7. A Define the moment of a force and state the S.I unit. 2marks b A uniform metre rule is balanced at the 30 cm mark when a load of 0.8N is hung at the zero mark as shown in figure 3 below. Fig 3 Determine the weight of the metre rule. 2marks 8. Figure 4 shows ice in a beaker. Fig.4 State and explain the effect of raising temperature on the overal stability of the beaker and its contents. 2marks 0.8N 10 20 30 40 50 60 70 80 90 0 100 Waterwww.freekcsepastpapers.comPage 192 9. The pointer of an unloaded spring reads 20 cm. When a mass of 120g is applied to the spring, the pointer reads 28cm. A pan in which a mass of 200g is placed is now hang from the spring and the pointer reads 35cm. Determine the mass of the pan. 3marks 10. Sketch a displacement-time graph for a body thrown upwards and falls back to the ground. 2marks 11. State one property of a fluid that obeys Bernoulli s effect. 1mark SECTION B 55 MARKS 12. A Show that, for an inclined plane, its velocity ratio is given by, 1 where is the angle of inclination. 3marks b Sketch a block and tuckle system of pullies with a velocity ratio of 4. |
1mark SECTION B 55 MARKS 12. A Show that, for an inclined plane, its velocity ratio is given by, 1 where is the angle of inclination. 3marks b Sketch a block and tuckle system of pullies with a velocity ratio of 4. 3marks c Figure 5 shows a cross-section of a handle of a screw jack 70 cm long and pitch of the screw is 0.8 cm. Given that the efficiency is 60 , determine: i The velocity ratio of the system. 2marks ii If an effort of 50N is applied calculate the load that can be lifted. 3marks 13. A Define specific heat capacity and state its S.I unit. 2marks b Equal masses of water and paraffin are heated for same length of time. The final temperature of paraffin was found to be greater than the final temperature of water. Explain the observation. 2marks c A hot-water tank for a house contains 150kg of water at 150C. the tank itself has a heat capacity of 6000 JK-1. An immersion heater is used to heat the water to 500c. The tank is well insulated and the power of the heater is 2500W specific heat capacity of water 4200 JKg-1K-1 i Find the amount of heat transferred to the water 2marks ii Find how much heat is absorbed by the tank 2marks iii Determine the time it will take the heater to raise temperature to 500C. 3marks 14. A Explain the meaning of an ideal gas. 1mark b Sketch a graph of volume against the inverse of pressure at a constant temperature. 2marks c On the same axis of the sketch in 14 b above, sketch the graph when temperature is raised for the same gas 1mark d A bubble of air of volume 1cm3 is released by a deep-sea diver at a depth where the pressure is 30 atmospheres. Assuming its temperature remains constant. Determine its volume just before it reaches the surface where the pressure is 1.5 atmosphere? 3marks e Figure 6 shows apparatus used in investigating a gas law. |
Assuming its temperature remains constant. Determine its volume just before it reaches the surface where the pressure is 1.5 atmosphere? 3marks e Figure 6 shows apparatus used in investigating a gas law. Study it and answer the questions that follow. I State the law under investigation. 1mark ii Describe how the set up can be used to verify the law stated in i above. 4marks 0.8cm 70 cm Handle Load Basewww.freekcsepastpapers.comPage 193 15. A Define the radian as applied in circular motion. 1marks b A body in circular motion with constant speed is said to be accelerating. Explain this observation. 1mark c Figure below shows masses A, B and C placed at different points on a rotating table. The angular velocity of the table can be varied. I State two factors that determine whether a particular mass slides off the table or not. 2marks ii State the mass that slides off last. Give a reason for your answer. 2marks iii A ball of mass 100g tied to a light to a light string is being whirled in a vertical circle of radius 0.5m with uniform speed. At the lowest position the tension in the string is 2.8N. Calculate i The angular velocity of the ball. 3marks ii The tension in the string when the ball is at the upper most position of the circular path. 2marks 16. A State two factors affecting the upthrust experienced by an object immersed in a fluid. 2marks b Explain how a submarine is made to float and sink in water. 2mark c Figure 8 shows a simple hydrometer. I Explain why the bulb is made wide. 2mark ii State the purpose of the lead shots in the glass bulb 1mark iii Describe how the hydrometer can be made more sensitive. 1mark iv Describe how the hydrometer is calibrated to measure relative density. |
I Explain why the bulb is made wide. 2mark ii State the purpose of the lead shots in the glass bulb 1mark iii Describe how the hydrometer can be made more sensitive. 1mark iv Describe how the hydrometer is calibrated to measure relative density. 2marks Masses Rotating table B A Cwww.freekcsepastpapers.comPage 194 MUMIAS WEST JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 THEORY TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES: Answer all questions in section A and B. All working must be clearly shown. Scientific calculators and KNEC Mathematical tables may be used. Take g 10m s2 SECTION A 25 MARKS 1. The figure 1 below shows the image in front of a mirror M. By ray diagram construction, locate the position of the object. 2mks 2. Figure 2 below shows a sharp pin fixed on a cap of leaf electroscope. The electroscope is highly charged and then left for some time. Explain why the leaf collapses. 1mk 3. Explain how polarization reduces current in a simple primary cell. State how it can be reduced. 2mks 4. Fig 3 below shows a ray incident on a converging lens. Fig. 3 Complete the ray diagram by showing the emergent ray. 1mk 5. The chart below shows an arrangement of different parts of the electromagnetic spectrum. Radio A Infrared Visible B X-Rays Gamma Rays i Name the radiation represented by B. 1mk ii Name a device that can be used to detect radiation A. 1mk 6. An object is placed in between two parallel mirrors. How many images can a student see? 2mks Sharp pin Eye IConverging lenswww.freekcsepastpapers.comPage 195 7. A car battery requires topping up with distilled water occasionally. Explain why this is necessary and why distilled water is used 2mks 8. What causes electrical resistance in conductors? 1mk 9. In determining the depth of an ocean, an echo sounder producing ultrasonic sound is used. Give one reason why this sound is preferred. |
1mk 9. In determining the depth of an ocean, an echo sounder producing ultrasonic sound is used. Give one reason why this sound is preferred. 1 mk 10. State the conditions necessary for a wave incident on a slit to be diffracted. 2mks 11. Figure represents a long horizontal insulated wire XY connected in an electric circuit. The circle represents where a plotting compass is placed on the wire. I In the circle put an arrow to show the direction the N pole of the compass will deflect when switch k. is closed. 1mk ii Mention any two ways of reversing the direction captured in i above. 2mk 12. The diagram below shows a permanent magnet suspended by a spring. State with a reason the behavior of the magnet when the switch is closed. 2mks 13. A Define principal focus as used in curved surfaces. 1mk b An object OB is placed in front of a convex mirror as shown below drawn to scale. I Draw a ray diagram to show the position of the image formed. 3mks KAX Y B O F C Soft iron core y x S Spring N Swww.freekcsepastpapers.comPage 196 SECTION B 55 MARKS 14. A State the basic law of electrostatics. 1mks b Figure 3 shows a pear shaped conductor with positive charged on its surface. A proof plane is used to touch side B of the conductor and then the cap of an uncharged electroscope. This is then repeated with side A. i Give the observation made on the electroscope in each case. 2mks ii What conclusion is drawn from the observation in i above 1mk iii Draw on the diagram above the illustration of your conclusion in ii above. 1mk iv Name one application of such a conductor. 1mk c The figure below shows an arrangement which may be used to charge a capacitor of capacitance 5 0F and then to connect it to a capacitor of capacitance 20 F. i The switch S is first placed at position A, so that the capacitor C is connected to the 12V dc supply. Calculate the charge stored in the capacitor. 3mks ii The switch S is now changed to position B. |
The ammeter reading and voltmeter reading are shown on the scales belowwww.freekcsepastpapers.comPage 198 i Record these two readings. 2mk ammeter reading ................................................................................... A voltmeter reading ................................................................................... V d Using the values above calculate i the resistance of R, 2mks ii find the total resistance of the circuit 2mks e Which two indicators guide one on when to recharge a lead acid accumulator? 2mks 17. A Some students wish to determine the focal length of a convex lens of thickness 0.6cm using an optical pin and a plane mirror. Figure 6 shows the experimental set up when there is no parallax between the pin and the image. Determine the focal length of the lens 2mks b An optician in Eldoret Hospital examined an eye of a patient and made the following observations: Eye too short and the focal length of the eye lens short i State the eye defect the patient could be having. 1mk ii Use a diagram to describe how the defect could be corrected. 2mks c The graph below shows the variation of 1 v and 1 u in an experiment to determine the focal length of a lens. Fig. 7 i Use the graph to determine the focal length 3mks ii What is the power of the lens used? 2mks d A converging lens forms an image which is three times the object. Determine the focal length of the lens if the distance between the object and the screen is 80cm. 3mks 18. A The figure below shows a ray of light PQ incident on air-water interface. The ray strikes the bottom surface at M instead of N The ray makes an angle of 40o at N and 54o at M with the horizontal i Determine; I. the angle of incidence. 1mk II. The angle of refraction. 1mk ii Calculate the refractive index of water. |
D Tap the wire at L 20cm. Close the switch read and record in the time provided the milliammeter and voltmeter reading. E Repeat the procedure in c for other values of L, shown in the table below and complete the table. 8mks L cm L m V Volts I mA I Amps IVR 20 30 40 50 60 80www.freekcsepastpapers.comPage 201 f i Plot the graph of R Y-axis against L m . 5mks ii Determine the slope of the graph. 3mks iii Given that APLR were A is the cross-sectional area of the wire and P is a constant for the material of the wire, determine the value of the constant P. 3mks QUESTION 2 PART A You are provided with the following: 1. A white screen with crosswires 2. A Mounted lens 3. A White screen 4. A Candle 5. A Metre rule Proceed as follows: f Estimate the focal length of the lens by focusing the image of a distant object on the screen provided e.g. distant window. Fo cm 1mark g Arrange the apparatus as shown. With the object cross-wires illuminated using a candle flame placed at 15 , move the screen until a sharp magnified image of the object is formed on the screen. Measure and record the corresponding value of y in the table. |
2 marks 2. The diagram below shows a section of a micrometer screw gauge. A State the smallest measurement that can be made by the micrometer screw gauge. 1 mark b The thimble of the micrometer screw gauge is rotated through 2 revolution in the clockwise direction in order to measure the diameter of a marble. State the diameter of the marble. 1 mark 3. The figure below shows two identical containers A and B containing hot water and ice block. State with reason which water cools faster assuming that the wire gauge absorbs negligible heat. 2 marks 4. A bus that carries goods in the under seats carrier is more stable than one that carries goods in the carrier at the top. Explain why this is so. 1 mark 5. A turntable of radius 16 cm is rotating at 960 revolution per minute. Determine the angular speed of the turntable. 2 marks 6. Sketch a velocity time graph for a body initially moving at a velocity u before a force F is applied to it for 5 seconds and there after the force F is withdrawn. 2 marks Ice block wrapped with wire gauze Floating ice block Hot water B Awww.freekcsepastpapers.comPage 171 7. The figure below shows a pith ball in a container. 2 marks State and explain what would happen if air is blown over the mouth of the container. 2 marks 8. The figure below shows a capillary tube placed in a trough of a mercury. Give a reason why the level of mercury in a capillary is lower than in the beaker. 1 mark 9. A cork enclosing steam in a boiler is held by the system below. If the area of the cork is 15 cm2 and a force of 500N is needed to keep the cork in place, determine the pressure of the steam in the boiler. 3 marks 10. In an experiment a crystal of potassium permanganate was placed in water as shown below. After sometime, it was observed that the water turned purple. Explain the observation. 1 mark 11. An aircraft 300m from the ground traveling horizontally at 400m s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of release. Ignore air resistance 2 marks 12. |
An aircraft 300m from the ground traveling horizontally at 400m s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of release. Ignore air resistance 2 marks 12. A 20kw immersion water heater is used to heat 5.0 x 10-3 m3 of water from 230C to 1000C. Given that 30 of heat is lost to the surroundings, determine the time used in heating the water. 2 marks 13. When the flask is placed in iced water the level on water rose and then fell. Explain the observation. 1 mark Container Pith ball Bench Potassium permanganate Cork Water Waterwww.freekcsepastpapers.comPage 172 SECTION B. 55 MARKS 14. The graph curve below show the variation of force against extension cm of the spiral springs of the same material, same wire thickness length but of different diameters one large and the other small . Identify which graph A or B represents which spring. 2 marks 15. A State the principle of moments. 1 mark b A uniform metal strip is 3.0cm wides 0.6cm thick and 100cm long. The density of the metal is 2.7g cm3. I Determine the weight of the metal strip. 3 marks ii The strip is placed on a pivot and kept in equilibrium by forces as shown. Determine the value of F and R. 3 marks 16. The figure below shows an inclined plane, a trolley of mass 60kg being pulled up the slope by a force of 200N parallel to the slope. The trolley is moved from X to Y. Determine the, i Work output of the system. 2 marks ii Work input of the system. 2 marks iii The frictional force between the wheels of the trolleys and the inclined plane. 2 marks iv The efficiency of the system. 2 marks v The velocity ratio of the system. 2 marks EXTENSION CM FORCE N www.freekcsepastpapers.comPage 173 17. |
What volume of the glass lies under the surface of mercury. 3 marks d A piece of sealing wax, weighs 3N in air and 0.22N when immersed in water, calculate the density of the wax. 3 marks e A balloon weighs 10N and has a gas capacity of 2m3. The gas in the balloon has a density of 0.1kg m3. If the density of air is 1.3kgm-3, calculate the resultant force of the balloon when it is floating in air. 3 marks 19. A Distinguish between speed and velocity. 1 mark b The figure below shows the motion of a ticker tape through a ticker timer whose frequency is 100Hz. Determine i Velocity at AB and PQ. 2 marks ii Constant acceleration of the tape. 2 marks c State Newton s second law of motion. 1 mark www.freekcsepastpapers.comPage 174 NAKURU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 THEORY 2 HOURS INSTRUCTIONS TO CANDIDATES a Answer ALL the questions in Section A and B. b All working MUST be clearly shown c Non-programmable silent electronic calculators and KNEC Mathematical tables may be used for calculations SECTION A 25 MKS 1. A Figure 1 shows a ray of light incident on a plane mirror at point X. FIGURE 1 Complete the diagram indicating the angle of reflection. 2mks b State one characteristic of the image formed on plane mirror, 1mk 2. A Figure 2 shows a stationary charged rode X placed between two freely suspended charged rods, Y and Z. The charge on rod Z is indicated. Identify the type of charge on rods X and Y. 1mk b State one use of a charged gold leaf electroscope. 1mk 3. State the reason why current produced by a simple primary cell decreases rapidly when the cell is in use. 1mk 4. A State the reason why a freely suspended magnet always settles facing a particular direction. 1mk b Figure 3 shows poles of two bar magnets placed close to one another. |
1mk 4. A State the reason why a freely suspended magnet always settles facing a particular direction. 1mk b Figure 3 shows poles of two bar magnets placed close to one another. Sketch the magnetic field pattern in the space between the poles. 1mk 5. Figure 4 shows the cross section of a conductor carrying some current and held between magnet field. Indicate using an arrow on the diagram the direction the conductor moves when released. 1mk 6. A What is meant by the term echo? 1mk FIGURE 3 FIGURE 4 Conductor FIGURE 2www.freekcsepastpapers.comPage 175 b Compare the speed of sound in air and in steel. 1mk c State one difference between stationary wave and progressive wave. 1mk 7. A State one difference sound waves and radio waves. 1mk b Figure 5 shows how displacement varies with distance of a certain wave. 1mk FIGURE 5 On the same diagram, indicate the wavelength of the wave using the symbol. 1mk 8. A State one characteristic of images formed by a concave mirror. 1mk b Figure 6 shows a concave mirror of focal length 10cm and an object O, placed 15cm in front of the mirror. Using a ray diagram, complete the diagram to locate the image, I, formed. 2mks 9. Figure 7 shows an immersion heater used to heat some water initially at 250C to boiling point. State two factors that determine the time taken for the water to boil. 2mks 10. A radioactive substance initially has a mass of 0.4g and decays to 0.05g in 75 minutes. Determine the half-life of the substance. 2mks 11. State one difference between X-rays and infrared waves. 1mk 12. Figure 8 a and b shows P n junctions, each connected to a cell and a lamp. It is observed that the bulb in a does not light while the bulb in b lights. Explain the reason for these observations. |
Figure 8 a and b shows P n junctions, each connected to a cell and a lamp. It is observed that the bulb in a does not light while the bulb in b lights. Explain the reason for these observations. 2mks Displacement cm Water Heating coil Distance cm www.freekcsepastpapers.comPage 176 SECTION B 55 MARKS 13. A Define the term critical angle of a refracting media. 1mk b One of the conditions necessary for total internal reflection to occur is that the critical angle must be exceeded. State the other condition. 1mk c The figure below shows a ray of light travelling from air and through a prism made of glass of refractive index 1.7. I On the diagram show the critical angle. 1mk ii Determine the I Critical angle 2mks II. Angle x and y 2mks 14. A Define the term Thermionic emission 1mk b The figure below shows the sketch of a cathode ray Oscilloscope. I Label the parts marked A and C. 2mks ii State the functions of the parts labeled B and D. 2mks iii Explain briefly how the C.R.T works. 2mks 15. When a radiation of wavelength 1.8 x 10-9 m falls on a photo emissive surface, the photoelectrons can be stopped when a positive terminal of 400V is applied on the surface. Given that the electronic charge 1.6 x 10-19 C, mass of the electron 9.1 x 10-31 kg, Planck s constant 6.62 x 10-34 Js, C 3.0 x 108m s, calculate the; i The work function of the surface. 2mks ii The threshold frequency. 2mks 16. The figure below shows a 3- pin plug with the wires connected. A i Identify the pins A, B and C and give the colour code of each. 3mks ii State the pin to which a switch should be connected to. |
Determine the i Maximum energy contained in the cathode electrons. 1mk ii Wavelength of the x-rays produced. 2mks Take h 6.62 x 10 -34Js, C 3.0 x 108 m s 19. The figure below shows two capacitor plates held parallel to each other. A State and explain what happens to the capacitance of the plates if the top plate is moved as shown. 2mks b Show that if three capacitors in parallel have capacitances C1, C2 and C3, then the network capacitance is given as follows. CN C1 C2 C3 2mks c The figure below shows a network of capacitors. Determine the network capacitance. 2mks 20. A The figure below shows an experimental set-up consisting of a mounted lens L, a screen S, a metre rule and a candle. I Describe how the set-up may be used to determine the focal length, f, of the lens. 4mks ii State the reason why the set-up would not work if the lens was replaced with a diverging lens. 1mk b An object placed 15cm from a convex lens is magnified two times. Determine the focal length of the lens. 3mks Candle 10 F 5 F 1 F 7 F 3 F 2 F L S Metre rulewww.freekcsepastpapers.comPage 179 NAKURU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education 232 3 PHYSICS Practical PAPER 3 CONFIDENTIAL Question 1 A 100 cm nichrome wire mounted on a millimeter A B S.W.G 28. An ammeter 0 1A . A voltmeter 0 5 V . 2 dry cells 1.5V each . A cell holder. A torch bulb and a bulb holder. Eight connecting wires at least 4 with crocodile clips. A switch. A micrometer screw gauge. Question 2. |
D1 d2 1mk Average of d1 and d2 mm 1mk b Connect the apparatus as shown below. Fig 1 c Place the sliding contact at P 20cm from A and then close the switch. Record the readings of both the current and voltage in the table below. D Repeat the above experiment by placing P at 40cm, 60cm, 70cm, 80cm and 100cm from A. Record your readings in the table below. 5 mks i Length cm Ammeter reading I A Voltmeter reading P.d V 20 40 60 70 80 100 A Bwww.freekcsepastpapers.comPage 181 ii What happens to the bulb as L increases? 1mk e i Plot a graph of I A against P.d V on the grid provided. 5mks ii Determine the slope of the graph at V 0.6V, stating its SI units. 3mks iii Determine the cross section area A of the wire in m2. 2mks iv Given that AeILV find e at L 0.70M. 2mks Question 2 Part A You are provided with the following: A coin 20 shilling coin Metre rule labeled with its mass Knife edge Measuring cylinder, 100ml Container with water Procedure i Record the mass of the rule Mr. Mr g 1mk ii Balance the rule on the knife edge. C.O.G cm 1mk iii Put the rule on the knife edge d1 cm from the centre of the rule. Iv Place the coin as shown in the figure below and adjust it until it gain balances horizontally. Fig 2. V Measure d1 cm 1 2mk d2 cm 1 2mk vi Determine mass of coin MC in grams. 2mks 1.3dd x MM21rC vii Using the measuring cylinder, estimate the volume of the coin. |
Fig 2. V Measure d1 cm 1 2mk d2 cm 1 2mk vi Determine mass of coin MC in grams. 2mks 1.3dd x MM21rC vii Using the measuring cylinder, estimate the volume of the coin. VC cm3 1mk viii Calculate the density of the material of the coin. C g cm3 1mk PART B You are provided with the following a triangular glass prism a metre rule a 50 g mass some hot water some cold water some thread a thermometer one stand, one boss and clamp a beaker Proceed as follows a Using a piece of thread suspend the metre rule from the clamp on the stand and adjust the position of the thread until the metre rule balances horizontally. Note this position, O of the thread. This position of the thread must be maintained throughout the experiment www.freekcsepastpapers.comPage 182 b Using another piece of thread suspend the glass prism from the meter rule at a point 35cm from O. Suspend the 50g mass on the opposite side of O using another piece of thread. Adjust the position of the thread attached to the 50g mass until the metre rule balances once more. I Determine the distance L1 between O and the point of support of the 50g mass. L1 cm 1mk ii Use the principle of moments to determine the weight W1 of the prism in air. Take g 10N kg 2mks c. Put cold water into the beaker approximately three quarter full . With the glass prism still at 35cm from O, determine the distance L2 of the 50g mass at which the rule balances when the prism is fully submerged in the cold water. I L2 cm 1mk II Determine the weight W2 of the prism in the cold water. 2mks d Measure and record the temperature T1 of the cold water when the system is balanced. |
With the glass prism still at 35cm from O, determine the distance L2 of the 50g mass at which the rule balances when the prism is fully submerged in the cold water. I L2 cm 1mk II Determine the weight W2 of the prism in the cold water. 2mks d Measure and record the temperature T1 of the cold water when the system is balanced. T1 0C 1mk e Now pour out the cold water and replace it with hot water. Balance the metre rule with the prism fully submerged in hot water. Ensure that the prism is still supported at 35cm from O. i Determine the distance L3 of the point of support of the 50g mass when the prism is submerged in hot water. L3 cm 1mk ii Measure and record the temperature T2 of the hot water. T2 0C 1mk iii Determine the weight W3 of the prism in hot water. 2mks f Determine the constant k for the water given that: 2mks 21TTWWWWWWk Prism Metre rule Stand Cold water Stand Metre rule Prism 50g L2 35cm 50g 35cm L1www.freekcsepastpapers.com 154 EASTERN CLUSTER EVALUATION, 2023 Kenya Certificate of Secondary Education KCSE 232 1 PHYSICS PAPER 1 TIME: 2 HOURS Instructions to candidates i Answer ALL the questions in section A and B. ii ALL working MUST be clearly shown. Iii Non programmable silent calculators may be used. SECTION A 25 MARKS Answer all the questions in this section. 1. A stopwatch reads 01:10:84 and 02:26:90 before and after an experiment respectively. Determine the duration of the event in SI units. 2 marks 2. Explain the meaning of thermodynamics as a branch of physics. 1 mark 3. Two glass tubes are dipped into a beaker of water as shown in figure 1 below: Indicate on the diagram, the level of water in the glass tubes 1 mark a Explain your answer in 3 a above 2 marks 4. |
Explain the meaning of thermodynamics as a branch of physics. 1 mark 3. Two glass tubes are dipped into a beaker of water as shown in figure 1 below: Indicate on the diagram, the level of water in the glass tubes 1 mark a Explain your answer in 3 a above 2 marks 4. A body is vertically projected upwards from the ground at a velocity of 5m s and takes 1 seconds to return to the ground. Draw a velocity-time graph of the body for its entire duration of flight. 2 marks 5. Motor vehicles such as tractors which work on swampy areas have wide tyres fitted on them. Explain. 1 mark 6. The figure 2 below shows a uniform metre rule which is pivoted at 30.0cm mark. The spring balance is fastened at the 100cm mark and it is at equilibrium when the spring balance records 1.2N. Figure 2 Determine the weight of the metre rule. 3 marks 7. In the determination of size of an oil molecule, lycopodium powder is sprinkled on the water surface before oil drop is introduced onto the surface of the water. Give reason for this. 1 mark 8. In a hydraulic lift, a force, F1, is applied on the effort piston of cross sectional area, A1. A force F2, is experienced on the load piston of cross sectional area, A2 .applying the principle of transmission of pressure in liquids derive an expression for the force F2 in terms of F1, A1 and A2. 2 marks 9. Alcohol and mercury are the two most used thermometric liquids. Give a reason why one would prefer alcohol to mercury for a particular measurement of temperature 1 mark 0cm 3O cmSpring balance 100cmwww.freekcsepastpapers.com 155 10. The figure 3 below shows a funnel inverted over a light pith ball on a table. Air is blown into the funnel as indicated on the diagram. Give a reason why the pith ball rises. 2 marks 11. A trolley of mass 20kg moving at 0.8m s on frictionless horizontal surface was acted upon by a force of 2.5N. After impact the body moves at 4.8m s. Determine the time of impact of the force. |
A trolley of mass 20kg moving at 0.8m s on frictionless horizontal surface was acted upon by a force of 2.5N. After impact the body moves at 4.8m s. Determine the time of impact of the force. 3 marks 12. The figure 4 below shows two identical thermometers A and B placed near and at equal distances on either side of a hot metal plate painted black on the side A and silvery on side B. Figure 44 State and explain the observation made on the reading of the thermometers after some minutes. 2 marks 13. The figure 5 below shows beaker containing water at 00. The beaker is placed on a bench. Figure 5 State and explain the changes in stability of beaker when water freezes. 2 marks SECTION B 55 Marks Answer all questions in this section. 14. A pulley system having a velocity of 3 is used to raise a load of 800N through a height of 0.6m at a constant speed using an effort of 300N in a time of 15 seconds. A Draw a diagram in the spaces provided below to show the pulley system and on it mark the direction of tension on all the string sections Label the load and effort 2marks b Calculate the mechanical advantage of the pulley system; 2marks c Find the efficiency of the pulley system; 3marks d Calculate the power developed by the effort. 3 marks e Give two reasons why the efficiency of the pulley system is less than 100 . 2 marks 15. A State two ways in which the centripetal force on a body of mass M can be increased. 2 marks b Figure 7 below shows an object of mass 200g at the end of a string 120cm long being whirled round a vertical circle in the direction shown. Figure 7 Air Pith ball Figure 3 RWater at 00C Rwww.freekcsepastpapers.com 156 i State two forces acting on the object at any instant as it continues to move in the vertical circle. 2 marks ii Indicate with an arrow on the figure the direction of the Centripetal force F and theVelocity V at the position of the object shown. |
2 marks b Figure 7 below shows an object of mass 200g at the end of a string 120cm long being whirled round a vertical circle in the direction shown. Figure 7 Air Pith ball Figure 3 RWater at 00C Rwww.freekcsepastpapers.com 156 i State two forces acting on the object at any instant as it continues to move in the vertical circle. 2 marks ii Indicate with an arrow on the figure the direction of the Centripetal force F and theVelocity V at the position of the object shown. 2 mark iii State the reason why the object is accelerating while its speed remains constant. 1 mark iv Given that the angular velocity of the body is 5 rad s-1, find the: I. linear velocity 2 marks II. Tension of the string at point R, the lowest point. 3 marks 16. A State two differences between boiling and evaporation. 2mks b The figure 6 below shows two identical containers A and B containing hot water and ice block. State with reason which water cools faster assuming that the wire gauge absorbs negligible heat. 2mks c 1200 g of a liquid at 200C is poured into a well-lagged calorimeter. An electric heater rated 1 kW is used to heat the liquid. The graph below shows the variation of temperature of the liquid with time. Use the graph below to answer the following questions: i What is the boiling point of the liquid? 1 mark ii How much heat is given out by the heater to take the liquid to the boiling point? 2marks iii Determine the specific heat capacity of the liquid. 3marks iv If 50 g of the liquid vapour was collected by the end of the 10 minutes, determine the specific latent heat of vaporization of the liquid. 3 marks Ice block wrapped in wire gauze Hot Water Floating ice B Awww.freekcsepastpapers.com 157 17. A Sketch a graph of volume of a fixed mass of a gas against pressure on the axes below. 1 mark b Explain why an air bubble increase in volume as it rises from the bottom of a lake to the surface. |
3 marks Ice block wrapped in wire gauze Hot Water Floating ice B Awww.freekcsepastpapers.com 157 17. A Sketch a graph of volume of a fixed mass of a gas against pressure on the axes below. 1 mark b Explain why an air bubble increase in volume as it rises from the bottom of a lake to the surface. 2 marks c When an inflated balloon is placed in a refrigerator it is noted that its volume reduces, use the kinetic theory of gases to explain this observation. 2marks e A glass capillary contains enclosed air by a thread of mercury 15cm long when the tube is horizontal, the length of the enclosed air column 24cm as shown. I What is the length of the enclosed air column when the tube is vertical with the open end uppermost if the atmosphere pressure is 750mmHg? 3 marks ii Explain why the mercury does not run out when the tube is vertical with the closed end uppermost. 1mark 18. A State Archimedes principle. 1mark b Figure below shows an experiment used to determine the density of an irregular piece of metal. The mass of metal in air is 200g. i Determine the volume of the stone in cubic metres. 2marks ii Calculate the density of the metal to 3 significant figures. 2marks c Given that the density of water is 1g cm3, determine; i The mass of water displaced. 2marks ii The up thrust acting on water. Take acceleration due to gravity, g, as 10ms2 2marks Volume V,Pressure P,24cm15cmwww.freekcsepastpapers.com 158 EASTERN CLUSTER EVALUATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 THEORY TIME: 2 HOURS SECTION A 25 MKS 1. State the effect on the image on the pinhole camera when more holes are added to the first hole. 1mk 2. Explain why it is necessary to leave the caps of a lead acid accumulator open while charging. 1mk 3. A current carrying conductor AB is in a magnetic field as shown below. A Indicate on the diagram the direction of the force F acting on the conductor. |
1mk 3. A current carrying conductor AB is in a magnetic field as shown below. A Indicate on the diagram the direction of the force F acting on the conductor. 1mk b State two factors that determine the direction of the force F. 2mks 4. A boy stands some distance from a high wall and claps his hands. What two measurements would need to be made in order to determine the speed of sound. 2mks 5. The depth of water in a pond is d1 cm. A point at the bottom of the pond appears raised by d2 cm when viewed from the surface. Determine the refractive index of water in terms of d1 and d2. 2mks 6. The figure below shows a displacement of a progressive water wave incident on a boundary between deep and shallow regions. I Complete the diagram to show what is observed after the boundary. 1mk ii What change occurs in the speed of the waves after the boundary? 1mk 7. An electric bulb is rated 75 W, 240v. Determine the resistance of the bulb. 3mks 8. The figure below shows a convex lens L an object O and a ray R passing through the lens and the possible path of the ray after passing through the lens. Complete the diagram and locate the position of the image I. 2mks 9. The chart below shows an arrangement of different parts of the electromagnetic spectrum. RADIOWAVES A INFRARED VISIBLE LIGHT B X-RAYS GAMMA RAYSwww.freekcsepastpapers.com 159 i Name the application of the radiation represented by B. 1mk ii Name a device that can be used to detect radiation A. 1mk 10. The figure below shows the main components of a cathode ray oscilloscope. I Name the part labelled A. 1mk ii What is the function of part labelled C. 1mk iii Explain how electrons are produced in a CRO. 1mk 11. The following reaction is part of a radioactive series. R 83210 --------- 84210 --------------- i Identify the radiation r. 1mk ii Determine the value of C. |
The following reaction is part of a radioactive series. R 83210 --------- 84210 --------------- i Identify the radiation r. 1mk ii Determine the value of C. 1mk 12. Explain briefly the doping process involved in making n-type semiconductor. 2mks SECTION B: 55MKS 13. A State Ohm s law. 1mk b Differentiate between ohmic and non ohmic conductors. 1mk c A battery of 12 v and an internal resistance of 1 ohm is used in the circuit below. Determine: i The ammeter reading. 3mks ii The reading on a voltmeter placed across the terminals of the battery. 2mks iii The reading on the voltmeter placed across PQ. 3mks 14. A Define capacitance of a capacitor. 1mk b State the effect on the capacitance of increasing the distance of separation of a parallel plate capacitor 1mk c The circuit below shows a capacitor connected to a 12v battery. I Find the combined capacitance. 3mks ii Find the total charge stored in the circuit. 3mks iii Find the charge stored on the 2uf capacitor. 2mks iv Find the total energy stored. 3mks www.freekcsepastpapers.com 160 15. A State Faraday s law of electromagnetic induction. 1mk b The figure below shows a step-up transformer commonly used at a power station. I What is meant by a step-up transformer? 1mk ii Why does a transformer work with a.c only? 1mk iii What is the purpose of the laminated soft iron core? 1mk iv From the information, determine:- I Voltage in the primary circuit. 2mks II Voltage in the secondary circuit. 2mks c The figure below shows a coil being rotated in a clockwise direction in a magnetic field. The set up produces an alternating current. Initially the coil lies in the plane of the field as shown below. I Name the parts labelled A and B. |
I What happens to the leaf of the electroscope? 1mk ii What would happen if radiation was red light? 1mk iii How is the cooling achieved in this kind of x ray machine? 3mks c In an experiment to find the relationship between frequency of a radiation and kinetic energy of the photoelectrons in a photoelectric device the following graph was obtained. Use the graph to determine i The Planck s constant h. 3mks ii The work function 2mks Zinc platewww.freekcsepastpapers.com 162 EASTERN CLUSTER EVALUATION, 2023 Kenya Certificate of Secondary Education 232 3 PHYSICS Paper 3 PRACTICAL CONFIDENTIAL Question One - Two dry cells of 1.5V each. -. Nichrome wire labeled W mounted on a metre rule. -. An ammeter 0-1.5A or 0-2.5A - A cell holder. -. Voltmeter. -. 8 connecting wires atleast 4 wash crocodile clips or a Jockey - A switch. -. A metre rule. Question Two - A metre rule. -. 10cm long cotton thread. -. Two masses of 10g. - Two masses of 20g. - Knife edge, 20cm high. -. A candle. -. A lens holder. -. A white screen. -. Converging len of focal length 15cm. Www.freekcsepastpapers.com 163 EASTERN CLUSTER EVALUATION, 2023 Kenya Certificate of Secondary Education KCSE 232 3 Physics Paper 3 PRACTICAL 2 Hours Answer all the questions. Question One You are provided with the following: - Two cells of 1.5V each - Nichrome wire labeled W mounted on a metre rule - An ammeter 0 1.5A or 0 - 2.5A - A cell holder - Voltmeter 0 5V - 8 connecting wires at least 4 with crocodile clips or a jockey - A switch - A metre rule Proceed as follows: a Connect the circuit as shown in the figure 1 below. |
Adjust the knife edge until the metre rule balances again at new mark. Record the length d1 and the corresponding length d2. I Repeat the procedure for different masses and complete the table 2 shown below. Table 2 Mass, m g 10 20 30 40 50 60 Distance d1 cm Distance d2 cm Mass m x distance d2 md2 ii Plot a graph of md2 against d1 5mks iii Calculate the slopes of the graph 2mks Part B You are provided with the following apparatus - A lens - A lens holder - A candle - A white screen - A metre rule Procedure e Set up the apparatus as shown in the figure 3 below: f Starting with u 30cm adjust the position of the screen to obtain a sharp image of the candle. Record value of V in the table shown below: g i Repeat the procedure above for u 20cm and complete table below: 2mks Table 3 u cm v cm M 20 30 ii Given that the focal length of the lens satisfies the equation, 1 determine the average value of the focal length. Www.freekcsepastpapers.comPage 138 IGAMBA NG OMBE Kenya Certificate of Secondary Education K.C.S.E 232 1 PHYSICS Paper 1 Time: 2 Hours INSTRUCTION TO CANDIDATES Answer ALL Questions in sections A and B. ALL workings MUST be clearly shown Mathematical tables and electronic calculators may be used. SECTION A 25 MARKS Answer ALL questions in this section in the spaces provided 1. A student used the apparatus shown in figure 1 below to determine the diameter of a cylinder. Fig. 1 What is the diameter of the cylinder? 1mk 2. An old man warming himself next to a jiko receives heat mostly by radiation. Explain why. 2mks 3. A hole of area 200mm2 at the bottom of a tank 4.0m deep is closed with a cork. Determine the force due to water Density of water is 1000kg m3, and acceleration due to gravity is 10m s2 3mks 4. |
2mks 3. A hole of area 200mm2 at the bottom of a tank 4.0m deep is closed with a cork. Determine the force due to water Density of water is 1000kg m3, and acceleration due to gravity is 10m s2 3mks 4. Give a reason why the scale of a hydrometer is calibrated downwards. 1mk 5. A fisherman jumping a shore from a boat may fall into water even if the boat is very close to the shore. Explain. 3mks 6. Explain why unboiled egg stops faster than a boiled egg when both are rolled together on a flat horizontal surface with same velocity. 2mks 7. An air bubble was released at the depth of 45m in a sea. The initial volume of the bubble at this depth was 3.0 x 10-5m3 and the temperature of water was 130C. What was its volume on reaching the surface of the water where the temperature was 230c. Atmospheric pressure 101Kpa and density of sea water 1020kgm-3 3mks 8. The diagram fig. 2 below shows a system of four pulleys. Show on the diagram how the string can be fixed so that the pulley has a velocity ratio of 3. 2mks 9. In the smoke cell experiment to show Brownian motion in gases, white specks in constant random motion are seen in the cell. What changes would be observed if the same set up is viewed at room temperature of about 250C and the then at a temperature of 140C. Explain your observation. 3mks 10. When two pieces of ice blocks are squeezed together once they form one block. Explain. 1mk 11. State two factors affecting centripetal force of a body moving in a circle. 2mks 12. Differentiate between streamline flow and turbulent flow. 1mk 13. Give one advantage of alcohol over mercury as a thermometric liquid. 1mk Fig. 2www.freekcsepastpapers.comPage 139 SECTION B 55 MARKS Answer ALL questions in this section. 14. The diagram fig. |
2www.freekcsepastpapers.comPage 139 SECTION B 55 MARKS Answer ALL questions in this section. 14. The diagram fig. 3 below shows an arrangement that a certain student set up in a physics lab without the consent of the teacher. He allowed some volume of water into the glass tube and measured the corresponding height h of water in the tube using a ruler. He tabulated his data as below. Burette reading cm3 5.1 8.2 15.4 21.5 28.0 35.6 Height h, cm 3.8 5.8 10.5 14.5 18.7 23.2 a i Draw a graph of the burette reading against height h of the water in the glass tube. 5mks ii Use your graph above to determine the area of cross section of the glass tube. 3mks iii Use your graph to determine how far the zero mark of the ruler is from the end placed on the base of the stand. 2mks 15. A i State the law of floatation. 1mk ii Explain why a hollow metal sphere floats on water while a solid metal sphere of the same material sinks in water. 2mks b The diagram fig. 4 below shows a uniform block of uniform cross-sectional area of 6.0cm2 floating on two liquids A and B. The lengths of the block in each liquid are shown. Given that the density of liquid A is 800kg m3 and that of liquid B is 1000kgm-3 determine the: 16. The diagram fig. 5 below shows apparatus used to investigate how pressure of some trapped air varies with temperature. A Name the parts X and Y. 2mks b What are the functions of 2mks i The stirrer ii Part Y. c At what Kelvin temperature will the pressure of the air theoretically be zero? 1mk d What name is given to this temperature? 1mk e A certain mass of helium gas occupies a volume of 1.6m3 at a pressure of 1.5 x 105pa at 120C. Determine its volume when the temperature is 273k at 1.0x105pa. |
I Show on the diagram the direction in which the stone flies when the string breaks and the position at which it breaks. 2mks ii Determine the speed at which the string breaks. 3mks c State one application of uniform circular motion. 1mk B A 3.3m 1.5m Fig. 6 C a i Determine the speed of the stone in ms 1 3mks ii Determine the tension in the string at positions B and C respectively. 4mks www.freekcsepastpapers.comPage 141 IGAMBA NG OMBE Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS Paper 2 Time: 2 Hours SECTION A 25 MARKS Answer all questions. 1. What property of light is illustrated by formation of shadows? 1mk 2. Other than local action state another defect of a simple cell and explain how it reduces the current produced. 2mks 3. The figure below shows a simple experiment using a permanent magnet and two metal bars X and Y. State, with reason, which bar is a soft magnetic material. 2mks 4. The figure below shows the image formed when an object is placed in front of a concave lens. Using suitable rays locate the position of the object. 3mks 5. Sketch the magnetic field pattern between the two poles of the magnet shown below. The wire carrying current is in between the poles. 2mks 6. The figure below shows a displacement time graph for a wave. Determine the frequency of the wave. 3mks 7. A mine worker stands between two vertical cliffs 500m from the nearest cliff. The cliffs are x metres apart. Every time he strikes the rocks, he hears the echos. The first one comes after 2.5s while the other comes 3s later. Calculate the distance between the cliffs. 3mks Metal bar Y Metal bar X During attraction After attraction X Ywww.freekcsepastpapers.comPage 143 14. A Define radioactivity. 1mk b Four nuclides are represented by the following symbols. 234 235 234 238 89 92 90 92 i Which nuclides are isotopes and which ones are isobars of the same element? |
A Define radioactivity. 1mk b Four nuclides are represented by the following symbols. 234 235 234 238 89 92 90 92 i Which nuclides are isotopes and which ones are isobars of the same element? 2mks ii Name the nuclides one of which could be produced from the other by emission of a beta particle. Write the equation of the reaction 2mks iii A manufacturer wishes to check on the thickness of steel sheets he produces. Describe how this could be done using radioactive source and a counter. 3mks c Explain how N-type and P-type semi-conductors are obtained. 3mks d Sketch a graph below of voltage against time for full wave rectification using 4 diodes. 2mks 15. A Name any two electromagnetic waves whose wavelength is shorter than visible light. 2mks b i The diagram above shows part of x-ray tube. Name parts A and B 2mks ii Why is part B preferred 1mk c i State two differences between x-rays and cathode rays. 2mks ii What is the effect on the wavelength of x-rays if the number of electrons hitting metal target are increased. 1mk iii What is the effect on wavelength of x-rays when p.d across the tube is decreased? 1mk d Calculate the maximum velocity of electrons that would produce x-rays of frequency 8.0 x 108Hz if only 20 of kinetic energy is converted to x-rays. 3mks Take Planks constant 6.63 x 10-34JS e The circuit diagram below was used to light 3v 0.5A bulb from 12.0v d.c supply. Determine the rate at which electrical energy is converted into heat energy in appliance R. |
1mk d Calculate the maximum velocity of electrons that would produce x-rays of frequency 8.0 x 108Hz if only 20 of kinetic energy is converted to x-rays. 3mks Take Planks constant 6.63 x 10-34JS e The circuit diagram below was used to light 3v 0.5A bulb from 12.0v d.c supply. Determine the rate at which electrical energy is converted into heat energy in appliance R. 3mks W X Y Z Voltage Time s A B X rayswww.freekcsepastpapers.comPage 144 IGAMBA NG OMBE Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 CONFIDENTIAL QUESTION 1 PART A You are provided with the following; Metre rule Complete stand A spring with a pointer Three masses one 100g mass and two 50g mass Stop watch PART B A rubber bung Approximately: D 2.53cm, d 2.00cm, h 2.81cm Vernier caliper Beam balance QUESTION 2 You are provided with the following. An ammeter 0-3A A voltmeter 0-5V 2 Dry cells A resistance wire mounted on mm scale 6 connecting wires A torch bulb in a bulb holder A cell holder A switch A jockeywww.freekcsepastpapers.comPage 145 IGAMBA NG OMBE Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL PAPER 3 TME: 2 Hours INSTRUCTIONS TO CANDIDATES a Answer all questions. B You are supposed to spend the first 15 minutes reading the whole paper carefully before commencing your work. C Candidates are advised to record their observations as soon as they are made. D Marks are given for observation actually made, their suitability, accuracy and the use made of them. |
B You are supposed to spend the first 15 minutes reading the whole paper carefully before commencing your work. C Candidates are advised to record their observations as soon as they are made. D Marks are given for observation actually made, their suitability, accuracy and the use made of them. QUESTION 1 PART A You are provided with the following; Metre rule Complete stand A spring with a pointer Three masses one 100g mass and two 50g mass Stop watch Proceed as follows; a Set up the apparatus as shown; b Hang the unloaded spring and record the pointer readings. X0 . M 1 mk c i Load a mass of 150g and determines the extension of the spring e1 .. m 1mk ii Displace the 150g mass slightly downwards and release it to oscillate vertically. Time 20 oscillations and obtain t1. T1 s 1mk iii Find the periodic time T1. T1 s 1mk iv Use the equation T1 2 to find the value of P1 . 2mks d i Load a mass of 200g and determines the extension of the spring e2 m 1mk ii Displace the 200g mass slightly downwards and release it to oscillate vertically. Time 20 oscillations and obtain t2. T2 s 1mk iii Find the periodic time T2. T2 . S 1mk iv Use the equation T2 2 to find the value of P2 . 2mks e Find the average of p. 2mks pav 1 22 Pointer Metre lSpring Stand Mwww.freekcsepastpapers.comPage 146 PART B You are provided with the following; A rubber bung Vernier caliper Beam balance Proceed as follows a Using the vernier caliper, measure the length D, d and h the height of the rubber band as shown in the figure. B Measure the mass M, of the rubber bung using the beam balance. |
1mk L2 50cm R2 . 1mk L3 70cm R3 . 1mk j Compute the average value of the resistance R of the bulb. 2mks www.freekcsepastpapers.comPage 117 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 1 PHYSICS PAPER 1 TIME: 2HRS INSTRUCTIONS TO CANDIDATES i Answer all questions in section A and B in the spaces below each question. Ii For numerical questions, show all your working iii Maths table and calculators may be used for calculation SECTION A 1. A salt solution of volume 30cm3 and density 1.1 g cm3 is mixed with 25cm3 of pure water of density 1g cm3. Determine a. Total mass of the mixture 1mk b. Density of the mixture 2 mks 2. The figure below shows a section of a Vernier callipers to measure the thickness of a wooden block. If the vernier calliper has zero error of. What is the actual reading of the vernier callipers 2mks 3. State the type of equilibrium for a rubber ball placed on a horizontal table as shown below 1mks 4. A ball is thrown vertically upwards and return to its starting point after 6 seconds. Calculate the maximum height reached g 10m s2 3 mks 5. A piece of paper is held in front of the mouth and air is blown horizontally over the paper.it is observed that the paper get lifted up. Explain this observation. 2mks 6. The figure below shows a uniform metre rule balancing when a mass of 200g is hung at one end. Determine the tension, T in the string. 3mks 7. A diver is 12m below the surface of water in a dam. If the density of the sea water is 1000kg m3. Determine the pressure due to the water on the diver. G 10N kg 2mks 8. A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime the whole volume of water was coloured. |
G 10N kg 2mks 8. A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime the whole volume of water was coloured. Explain this observation. 1mks 9. Define absolute zero temperature for an ideal gas. 1mk 10. A substance of mass 2kg and specific heat capacity 400jkg-1k-1 initially at 80 c is immersed in water at 19 c. If the final temp is 20 c. Calculate the mass of water specific heat capacity of water 4200jkg-1k-1. 3mks 11. The cover of a ball point has a small hole on the stem as shown below Explain its function 1mk 100 cm 200g Rubber ball 10cmwww.freekcsepastpapers.comPage 118 12. Give a reason why hot water put in a sufuria covered with a blackened aluminium foil cools faster than one covered with a shiny foil . 1mks 13. A mass of 7.5kg has a weight of 30N on a certain planet. Calculate the acceleration due to gravity on this planet 2mks SECTION B 55 MARKS 14. A Define angular velocity and state its SI unit 2mk b A stone of mass 500g is whirled in a vertical circle at 5 revolutions per Second. If the length of the string used is 1.5m, determine i The angular velocity 3mks ii The maximum tension of the string 3mks c State three factors that will make the stone to remain in a state of vertical motion 3mks d A glass block of mass 300g is placed on a frictionless rotating table while fixed 10cm from the centre of the table by a light thread. The string can withstand a maximum tension of 6.6N. Determine the maximum velocity that the table can attain before the string cuts. 3mks 15. A State Hooke s law 1mk b A form 4 student did an experiment on Hooke s law and from his data drew the following graph. GRAPH OF FORCE AGAINST EXTENSION From the graph, i Determine the spring constant. |
3mks 15. A State Hooke s law 1mk b A form 4 student did an experiment on Hooke s law and from his data drew the following graph. GRAPH OF FORCE AGAINST EXTENSION From the graph, i Determine the spring constant. 2mks ii Work done in producing an extension, e of 8cm. 2mks c State the factors which affect the spring constant calculated in b i above 2mks d A column of air 26cm is trapped by mercury thread 5cm long as shown in the diagram below. Www.freekcsepastpapers.comPage 119 e When the tube is laid horizontally as in figure ii the air column is now x cm long. When inverted as shown in figure iii , the length of the column is y cm. Find i The values of x 2mks ii The values of y 2mks Take atmospheric pressure to be 70cmHg 16. A State Newtons third law of motion. 1mk b A car of mass 900kg is initially moving at 20m s, calculate i Acceleration of the car 2mks ii The force required to bring the car to rest over a distance of 15M. 2mks c Two trolleys of masses 2.0 kg and 1.5kg travelling towards each other at 0.20m s and 0.35m s respectively combine head on. The trolleys combine on collision. Calculate the velocity of the combined trolleys. 3mks d A stone is projected vertically upwards with a velocity of 30m s from the ground. Determine the maximum height reached. 3mks 17. A State the law of floatation 1mk b The diagram below shows a wooden block of dimensions 50cm by 40cm by 20cm held in a position by a string attached to the bottom of a swimming pool. Density of block is 600kg m3, density of water 1000kg m3 The three forces acting on the block are tension T in the string, the weight W of the block and the up thrust U due to water. |
3mks 17. A State the law of floatation 1mk b The diagram below shows a wooden block of dimensions 50cm by 40cm by 20cm held in a position by a string attached to the bottom of a swimming pool. Density of block is 600kg m3, density of water 1000kg m3 The three forces acting on the block are tension T in the string, the weight W of the block and the up thrust U due to water. I Write an equation relating T, W and U when the block is at stationery position. 1mk ii What is the weight of the block? 3mks iii What is the weight of the water displaced by the block? 2mks iv Determine the tension T on the string. 2 mks c Some ether is put in a combustion tube and two glass tubes inserted into the tube through a cork as shown in the figure below. The combustion tube is then put into a smaller beaker containing some water and a thermometer dipped in the water. When air is blown into the ether, the reading in the thermometer lowers. Explain this observation 2mks www.freekcsepastpapers.comPage 120 18. A Complete the diagram below to show how the pulleys can be used to raise a load, L by applying an effort, E 2mks b The pulley system above has a mechanical advantage of 3. Determine i The velocity ratio of the system 2mks ii The efficiency of the system 2mks iii The effort when a load of 60N is raised 2mks www.freekcsepastpapers.comPage 121 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 TIME: 2HRS INSTRUCTIONS TO CANDIDATES: 1. Answer ALL the questions in section A and B. 2. All working MUST be clearly shown. 3. Non-programmable silent electronic calculators and KNEC mathematical tables may be used. SECTION A 25 MARKS 1. The figure below shows two rays drawn from an object on to the mirror. |
Non-programmable silent electronic calculators and KNEC mathematical tables may be used. SECTION A 25 MARKS 1. The figure below shows two rays drawn from an object on to the mirror. Complete the ray diagram to show the position of the image. 2 marks 2. A small chain is often seen hanging at the back of a petrol carrying lorry. State and explain its significance. 2marks 3. A Define diffraction with respect to waves. 1 mark b The diagram below show consecutive wave fronts. If the waves are moving towards the barrier, draw the wave fronts as they appear after passing through the aperture. 2 marks 4. State what determines the carrying capacity of an accumulator. 1mark 5. Sketch a displacement time graph of a wave of frequency 4HZ and amplitude 3.0cm over a time interval of 1.5 seconds 3mks 6. The figure below shows a set up used to study sound waves. Www.freekcsepastpapers.comPage 122 It is observed that when the bottle is shaken sound from the metal plates is heard. State and explain the observation that would be made if a little hot water is poured into the bottle and after sometime the cork is tightly replaced and the bottle shaken. 2 marks 7. The figure below shows a circuit diagram with cells in parallel. Each cell has e.m.f of 1.5V and internal resistance of 0.5 and the resistance of the bulb is 6 each. Determine the ammeter reading when the switch is closed. 3marks 8. An alternating voltage of peak value 15v and frequency 25Hz is applied to the terminals of a Cathode ray oscilloscope. The Y-gain is set at 5 v cm and the time base at 10 ms cm. Draw the trace observed on the screen. 2 marks 9. Name all the radiations of the electromagnetic spectrum which have higher wavelengths than the visible light in their increasing wavelengths. 1 mark 10. The figure below shows a diagram of circuit breaker . Explain how it operates 3mks 11. A resistance wire is 2 m long and has a cross-sectional area of 0.50 mm2. If its resistance is 2.6 , calculate its resistivity. |
Explain how it operates 3mks 11. A resistance wire is 2 m long and has a cross-sectional area of 0.50 mm2. If its resistance is 2.6 , calculate its resistivity. 3 marks SECTION II 55 MARKS 12. A The figure below shows a charged electroscope and two aluminum plates A and B arranged as shown. 1cm 1cmwww.freekcsepastpapers.comPage 124 14. A i What do you understand by the term accommodation? 1mk ii An object is placed 40cm in front of a concave lens of focal length 20cm; determine the position of the image. 3mks b The following graph shows the variation of image distance, v, with magnification, m, for a converging lens. Using the graph and the equation 1 to determine: i The object position when the image position is 45cm. 3marks ii The focal length of the lens. 1 mark iii The power of the lens. 2 marks c The following figure below shows an eye defect Name the defect and show on the same diagram how the defect could be corrected. 3 marks www.freekcsepastpapers.comPage 125 15. A What do you understand by the term mutual induction? 1 mark . B State two factors that determine magnitude of e.m.f induced in a coil. 2 marks . C The diagram below shows an induction coil used to produce sparks. I Name parts labeled A and B. 2marks ii Briefly explain how the induction coil works. 3 marks b A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A. Determine I the secondary e.m.f 2marks II the power in the secondary if the transformer is 95 efficient. 2mks 16. A The mains electricity is transmitted at high voltages. State two dangers of this high voltage transmission. 2marks b What is a fuse? 1mark c The figure shows a section of a domestic wiring. |
State two dangers of this high voltage transmission. 2marks b What is a fuse? 1mark c The figure shows a section of a domestic wiring. I Identify two serious mistakes in the circuit. 2marks ii Explain why the circuits in domestic wiring should be connected in parallel with the main supply. 1mark iii Mrs. Sitima has two 2.5KW electric heater, 2.0KW electric stove, two 60W electric bulbs, 500W electric fan and 1.0Kw electric pressing box. Her power supply is 240V and main fuse 30A. I Can she connect all the appliances to her power supply at the same time? 2marks II If the cost of electricity is Ksh.6.50 per unit, calculate the cost of using electric stove and electric pressing box for 3 hours a day in the month of June. 3marks www.freekcsepastpapers.comPage 126 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICALS CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Metre rule Knife edge 10 microscope slides A 50g mass A piece of cello tape A Vernier caliper can be shared Resistance wire fitted on a millimeter scale labeled MN, Nichrome wire G 32mm Switch Voltmeter 0-5V Ammeter 0-2.5A Two dry cells in a cell holder 8 connecting wires ,atleast 4 with crocodile clips Micrometer screw gauge To be shared Question 2 - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer -100-1100 - A 200ml beaker containing some water - A tripod stand and wire gauze - A cardboard carton with a hole in the middle with the size of the thermometer. |
2marks II If the cost of electricity is Ksh.6.50 per unit, calculate the cost of using electric stove and electric pressing box for 3 hours a day in the month of June. 3marks www.freekcsepastpapers.comPage 126 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICALS CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Metre rule Knife edge 10 microscope slides A 50g mass A piece of cello tape A Vernier caliper can be shared Resistance wire fitted on a millimeter scale labeled MN, Nichrome wire G 32mm Switch Voltmeter 0-5V Ammeter 0-2.5A Two dry cells in a cell holder 8 connecting wires ,atleast 4 with crocodile clips Micrometer screw gauge To be shared Question 2 - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer -100-1100 - A 200ml beaker containing some water - A tripod stand and wire gauze - A cardboard carton with a hole in the middle with the size of the thermometer. -. A burner - A rubber band - A stop watchwww.freekcsepastpapers.comPage 127 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL TIME: 2 Hours INSTRUCTIONS TO CANDIDATES a Answer ALL the questions. B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made. |
B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made. QUESTION ONE PART A You are provided with the following Metre rule Knife edge 10 microscope slides A 50g mass A piece of cellotape A pair of Vernier callipers Proceed as follows a Using the vernier calipers provided measure the length L and the width, W of the microscope slide L 1mk W 1mk b Stack ten 10 slides together using a cello tape as shown below fig 1. I Measure the thickness T of the stack of microscope slides. 1mk T ii Determine the volume v of the stack 2mk V LWT c Balance the metre rule at its centre of gravity and maintain the position of the fulcrum on the centre of gravity throughout the experiment Place the 50g mass and the stack of slides as shown in figure 4 below Adjust the position of both the50g mass and stacked slides until the rule is again balanced making the distances x and y as large as possible i x 1mk y 1mk Figure 1 T y x 50gwww.freekcsepastpapers.comPage 128 ii Calculate the mass m in grams of the stacked slides given that 2mk yxm50 iii Determine the density of glass given that vmdensity 2mk PART B You are provided with the following apparatus: Resistance wire fitted on a milliameter scale labelled MN Switch Voltmeter Ammeter Two dry cells in a cell holder Six connecting wires Micrometer screw gauge Proceed as follows; i. Set up the apparatus as shown in the Figure 3 below; ii. Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading V0. V0 ........................................ 1mark iii. Attach the Jockey to the resistance wire such that l 50cm iv. |
V0 ........................................ 1mark iii. Attach the Jockey to the resistance wire such that l 50cm iv. Record the voltmeter and ammeter readings as V1 and Z respectively V1 .............................................. 1mark Z ............................................. 1mark v. Determine the value of X given that 1mark vi. Use the equation below to determine the value of k , where m 2.549 2marks vii. Measure the diameter d of the of the wire on the milliameter scale using the micrometer screw gauge d ..............................mm .....................................m 1mark viii. Determine the resistivity of the wire used in this experiment given that 2marks www.freekcsepastpapers.comPage 129 Question two You are provided with the following; - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer - A large beaker containing some water - A tripod stand and wire gauze - A cardboard with a hole in the middle - A burner - A rubber band - A stop band - A stop watch Proceed as follows; a Set up the apparatus as shown in figure 4 below. B Heat the water in the beaker provided and leave it to boil c Wrap the given piece of duplicating paper round the bulb of the thermometer. Use rubber band to hold the paper in place. D Place the thermometer inside in the dry test tube. E Place the test tube in the water as shown in the diagram above. Make sure that the water does not enter the test tube. Leave the test tube in the boiling water until the thermometer indicates a steady temperature. F Remove the thermometer and immediately start the stop watch. While holding the thermometer in air record the readings of the thermometer T1 at intervals of 30seconds for 10 minutes. |
3marks 2. The density of a solid decreases after heating. Explain. 2marks 3. When a drop of oil is placed on the surface of water it spreads out forming a circular patch. Explain this observation. 2marks 4. A uniform meter rule is balanced as shown in the figure 2 below. The volume of the immersed object is 13. 5cm3. Determine the relative density of the liquid. 3marks 5. Give a reason why a person may nose bleed after ascending a high mountain. 1mark 6. A turntable of radius 10cm is rotating at 42 revolutions per second. Determine the linear speed of a point on the circumference of the turntable. 3marks 7. Figure 3 below shows a glass filled with hot liquid placed on a table immediately after wiping with water. State and explain what is observed when one tries to lift the glass after a few minutes. 2marks 8. In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be 10m and more. Give two reasons for this observation. 2marks Hot liquid Wet table Fig. 3www.freekcsepastpapers.comPage 99 9. When a mass of 2kg is hang from a single spring, the spring extends by a distance 10cm. Determine the total extension in the set up in Figure 4 below given that the springs are identical 2marks 10. Define the term viscosity. 1mark 11. State one reason why the efficiency of a machine is always less than 100 1mark 12. State two factors that determine the critical speed for a car moving along a curved road. 2marks SECTION B 55 MARKS Answer all the questions in this section 13. A State the law of Floatation. 1mark b A submarine made of iron was observed to float in water while a piece of iron rod sinks in water. Explain this observation 2marks c A solid displaces 5.0cm3 of liquid when floating and 20cm3 when fully immersed in it. Given that the density of the solid is 1.2g cm3. |
1mark b A submarine made of iron was observed to float in water while a piece of iron rod sinks in water. Explain this observation 2marks c A solid displaces 5.0cm3 of liquid when floating and 20cm3 when fully immersed in it. Given that the density of the solid is 1.2g cm3. Calculate i The weight of the solid 2marks ii Upthrust on the solid when floating 1mark iii The density of the liquid 3marks iv The upthrust when the body is fully submerged 3marks d Define the term relative density as used in liquids 1mark 14. A Define specific latent heat of fusion of a substance 1mark b Water of mass 400g at a temperature of 60oC is put in a well lagged copper calorimeter of mass 160g. A piece of ice at 0oC and mass 40g is placed in the calorimeter and the mixture stirred gently until all the ice melts. The final temperature, T, of the mixture is then measured. Specific latent heat of fusion of ice 334000J kg, specific heat capacity of water 4200J kgK specific heat capacity of copper 400J kgK Determine: i The heat absorbed by the ice during melting. 2marks ii Total heat gained by the melted ice Give your answer in terms of T 2marks iii Total Heat lost by the water and Calorimeter 3marks iv The final temperature T of the mixture. 2marks c Figure 5 below shows a block of ice with two heavy weights hanging such that the copper wire connecting them passes over the block of ice block resting on wooden support. It is observed that the wire gradually cuts its way through the ice block, but the ice is left as one piece. State the factor behind the observation. 1mark 2 Kg Fig. 4 Weights Wooden block Ice Block Fig. 5 Copper wirewww.freekcsepastpapers.comPage 100 15. A i Define the Impulsive force in terms of momentum. 1mark ii A striker kicks a ball of mass 250g initially at rest with a force of 75N. |
5 Copper wirewww.freekcsepastpapers.comPage 100 15. A i Define the Impulsive force in terms of momentum. 1mark ii A striker kicks a ball of mass 250g initially at rest with a force of 75N. If the foot was in contact with the ball for 0.10sec. Calculate the take-off velocity of the ball. 3marks b A bullet of mass 20g moving at 400 m s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into the block and the two move off together on a horizontal surface, where a frictional force of 4N is acting between the block and surface. I Determine the initial common velocity of bullet and wooden block. 3marks ii What distance does the block move before coming to rest? 3marks c Explain why a paratrooper flexes his legs as he lands. 2marks 16. The figure 6 below shows an inclined plane, a trolley of mass 30kg is pulled up a slope by a force of 100N, parallel to the slope. The trolley moves so that the centre of mass C travels from points A to B. i What is the work done on the trolley against the gravitational force in moving from A to B.? 2marks ii Determine the work done by the force in moving the trolley from A to B. 2marks iii Determine the efficiency of the system. 3marks iv Determine the work done in overcoming the frictional force. 1mark v Determine the mechanical advantage of the system. 2marks 17. Figure 7 below shows a trolley moving on a circular rail with a vertical plane, given that the mass of the trolley is 250g and the radius of the rail is 1.6m. i Determine the minimum velocity at which trolley passes point X. 3marks ii Find the angular velocity at point Z 2marks iii The force exerted on the rail at this point Z. 3marks iv State one application of circular motion in daily life. 1mark A C 100N B 10m 15 Fig. |
2marks b An optician in Eldoret Hospital examined an eye of a patient and made the following observations: Eye ball too small and the focal length of the eye lens too short. I State the eye defect the patient could be having. 1mark ii Use a diagram to describe how the defect could be corrected. 2marks c The graph below shows the variation of 1 v and 1 u in an experiment to determine the focal length of a lens. I Use the graph to determine the focal length. 3marks ii What is the power of the lens used? 1mark 15. A Define electric resistance. 1mark b Figure 7. Shows three resistors connected as shown. Fig 7 If the voltmeter reads 4V, find the i Effective resistance. 2marks ii Current through the 3 resistor. 2marks iii Potential difference across the 8 resistor. 2marks c i What is meant by the term lost volts ? 1mark ii A cell supplies a current of 0.5A when connected to a 2 resistor and 0.25A when connected to a 5 resistor. Find the e.m.f and the internal resistance of the cell. 4marks www.freekcsepastpapers.comPage 104 16. A On the axes provided below, sketch a graph showing the variation of frequency with wavelength at constant velocity. 1mark b Tv waves of frequency 6MHz travels with a speed of 3.0 x 108 m s. What is the wavelength? 2marks c Figure 8. Shows circular waves approaching a concave reflector. Fig. 8 Show the reflected waves and the missing part of incident wave 2marks d State two conditions necessary for two progressive waves traveling in opposite directions to form stationary waves. 2marks e Figure 9 shows the set up used to demonstrate interference of sound. Fig 9 i An observer O, moves along XY. State the observation s made. 1mark ii State what would be observed if a cathode ray oscilloscope is moved along line XY. 2marks iii What will a student hear if he moves along the line OC? |
State the observation s made. 1mark ii State what would be observed if a cathode ray oscilloscope is moved along line XY. 2marks iii What will a student hear if he moves along the line OC? 1mark iv Why are the loudspeakers connected to the same audio frequency generator? 1mark 17. A State one factor that affects the capacitance of a capacitor. Mark b Figure 10 shows a circuit diagram with three capacitors. Fig 10 Frequency f Wavelength www.freekcsepastpapers.comPage 105 i Determine the effective capacitance of the arrangement. 2marks ii Find the energy stored in the combinations of capacitors. 3marks c Explain why it is not advisable to shelter under a tree when it is raining. 1mark 18. A State two dangers of high voltage transmission. 2marks b A generator produces 150KW at a voltage of 5 kV. The voltage is stepped up to 60kV and transmitted through cables of resistance 150 to a step down transformer in a substation. If both transformers are 80 efficient, Calculate the:- i Current through the transmission cables. 3marks ii Power lost during transmission. 3marks 19. A The half life of cobalt 60 is 5years. How long will a sample take for the activity to decrease to 1 16 of its original value? 3marks b The graph below shows radioactive decay of iodine. Use the graph to determine the:- i Fraction of the amount remaining after 16.2 days. 1marks ii Determine the half life of iodine. 1marks iii Mass remaining after 17 days. |
Use the graph to determine the:- i Fraction of the amount remaining after 16.2 days. 1marks ii Determine the half life of iodine. 1marks iii Mass remaining after 17 days. 1mark www.freekcsepastpapers.comPage 106 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL PAPER 3 TIME: 2 HOURS CONFIDENTIAL Each candidate should be provided with the following: QUESTION 1 Resistance wire fitted on a scale labeled MN SW 28 Switch Voltmeter 0-3v or 0-5V Ammeter 0-2.5A OR 0-3A Two dry cells Six connecting wires at least 4 with crocodile clips QUESTION 2 A concave mirror Focal length 15 cm Mirror holder. A screen A meter rule A candle A match box to be shared A boiling tube A measuring cylinder 50ml A half metre rule Water in a beaker about 100ml A stand complete with boss and clamp Vernier callipers may be shared www.freekcsepastpapers.comPage 107 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL July Aug, 2023 TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES: Answer all the questions You are supposed to spend the first 15 minutes of 2 hours reading the whole paper carefully before commencing your work. Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use of them Record your observations as soon as you make them. Mathematical tables, slide rules and silent non-programmable electronic calculators may be used. |
A screen A meter rule A candle A match box to be shared A boiling tube A measuring cylinder 50ml A half metre rule Water in a beaker about 100ml A stand complete with boss and clamp Vernier callipers may be shared www.freekcsepastpapers.comPage 107 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL July Aug, 2023 TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES: Answer all the questions You are supposed to spend the first 15 minutes of 2 hours reading the whole paper carefully before commencing your work. Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use of them Record your observations as soon as you make them. Mathematical tables, slide rules and silent non-programmable electronic calculators may be used. Take g 10ms-2 QUESTION 1 a You are provided with the following apparatus: Resistance wire fitted on a millimeter scale labeled MN Switch Voltmeter 0-3V or 0-5V Ammeter 0-2.5 or 0-3 Two dry cells Six connecting wires i Set up the apparatus as shown in the fig 1 below. Ii Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading. V0 V 1mk iii Attach the crocodile clip to the resistance wire such that L 0. Read and record the ammeter reading at L 0 I0 A 1mk iv Repeat the procedure in iii and for L 10cm, 20 cm, 30 cm, 40 cm, 50cm, 60 cm, 70cm and 80 cm and record the voltmeter and ammeter reading in the table below. Switch L M N V A Crocodile clipwww.freekcsepastpapers.comPage 108 v Complete the table below. |
1 mark b Set up the apparatus as in figure 2 below. Fig 2 c Put the object at a distance u 30cm and from the concave mirror. Adjust the position of the screen until a sharp image is formed on the screen. Record the distance V Candle Screen MirrorU Vwww.freekcsepastpapers.comPage 109 d Repeat procedure c above for the distance u 40cm and record the new distance V, in the table below e Complete the table below. 3 marks f Given that , calculate the values of f in each case; 3 marks 2. PART B You are provided with the following: a boiling tube a measuring cylinder a half metre rule water in a container a stand complete with boss and clamp Vernier callipers may be shared Proceed as follows: a i Using the Vernier callipers measure the internal diameter, d , of the boiling tube provided d ........................................................ cm 1 2 mark ii Using the half meter rule measure the height of the boiling tube provided h cm 1 2 mark iii Calculate the volume of boiling tube 2marks b i Clamp the boiling tube vertically as shown in the figure 1 below. Ii. Using the measuring cylinder pour 25cm3 of water into the boiling tube. Measure and record in the table below the height h, of water in the boiling tube. Iii Repeat the procedure in b ii for other volumes of water, V, shown in the table. 3marks Volume, V, of water cm Height, h, of water cm S V h 25 35 45 iv Calculate the average value of S and state what it represents 2marks hU cm V cm m V U m 1 30 40 1 mvfwww.freekcsepastpapers.comPage 84 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 1 PHYSICS Paper 1 TIME: 2HRS Instructions to candidates i Answer ALL the questions in section A and B. ii All working MUST be clearly shown. Iii Non programmable silent calculators may be used. |
232 1 PHYSICS Paper 1 TIME: 2HRS Instructions to candidates i Answer ALL the questions in section A and B. ii All working MUST be clearly shown. Iii Non programmable silent calculators may be used. Constant: g 10N kg or 10m s2 SECTION A: 25 MARKS 1. The figure below shows a section of a meter rule used to measure length of a piece of wood. Find the length of the wood 2marks 2. The diagram below shows a capillary tube immersed in water. A Make a sketch on the figure alongside b to show the appearance of the capillary tube if it was inserted in mercury. 1 mark b Explain the difference if any between figure a and b above 2 marks 3. Explain why a partially inflated balloon released at sea level would become fully inflated at a higher altitude. 1mark 4. A catapult is used to project a stone of mass 40.0g vertically upwards to a height of 50.0m. Calculate the amount of elastic potential energy initially present in the catapult. 2marks 5. A turning effect of force depends on the magnitude of the force. State any other factor that determines the moment of a force 1mark i Mercury is usually preferred over water for use as a barometric liquid. Give a reason for this. 1mark ii State the property of Freon that makes it suitable for use as refrigerant. 1mark iii Other than the mass of ice, State another physical quantities that remain constant while pure ice is being converted to water. 1mark 6. Giving a reason, explain why it s advisable for luggage carrier compartment to be put under the seats than at the roof tops of the buses. 1 mark 7. Other than angle of banking, state any other factor that affects the critical velocity of a vehicle negotiating a bend. 1 mark 8. A balloon filled with argon gas of volume 200 cm3 at the earth s surface where the temperature is 200C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 00C and the pressure 100mm of mercury, calculate the volume of the balloon. 2marks 9. |
A balloon filled with argon gas of volume 200 cm3 at the earth s surface where the temperature is 200C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 00C and the pressure 100mm of mercury, calculate the volume of the balloon. 2marks 9. It is a common behavior for a high jumper to slightly flex their knees just before landing. Explain the importance of this behavior from your knowledge of physics. 1mark 11. The figure below shows a manometer containing water. Air is blown across the mouth of one tube and the levels of the water changes as shown. Explain why the level of water in the left limb of manometer is higher. 2 marks Blow air Water a b www.freekcsepastpapers.comPage 85 12. The figure below shows a uniform rod AB of weight 20N pivoted at A. If the system is in equilibrium, determine the weight W shown. 3marks 13. A cemented floor feels cold to the feet, but a woolen carpet on the same floor feels warm. Explain this. 1mark 14. The diagram below shows an arrangement used to determine the upper fixed point of ungraduated thermometer. I Why is the bulb of thermometer not dipped in the water? 1mark ii Explain how the sensitivity of a thermometer can be improved. 1mark SECTION B 55 MARKS 15. A State Archimedes principle . 1 mark b The figure shows a cube of side 2.0 m block and of mass 4,800 kg attached to the base of a tank containing paraffin of density 800 kgm-3 by means of an inextensible and light weight cable. Determine: i The density of the block. 2marks ii The upthrust acting on the block. 3 marks iii The tension in the cable. 2 marks iv The cable is then released, and the block rises to the surface where it subsequently floats. Calculate the fraction of the block which is beneath the surface of the paraffin. 2 marks 16. A Give two ways of increasing the boiling point of a liquid. |
Explain. 2 marks ii A block of density 1.60 g cm3 and measures 3.0cm by 5.0cm by 7.0cm was placed on the ground. Determine the difference between the maximum and minimum pressure that would be exerted on the ground by the block. 3 marks b i State Newton s second law of motion 1 mark ii A wooden block resting on a horizontal bench is given an initial velocity U so that it slides on the bench for a distance X before it stops. Various values of X are measured for different value of the initial velocity. The figure below shows a graph of U2 against X. i Determine the slope S of the graph 3 marks ii Determine the value of k given that U2 20kX where k is a frictional constant for the surface 2marks iii State with a reason what happens to the value of k when the roughness of the bench surface is reduced 2 marks 19. A i State the kinetic theory of gases. 1 mark ii State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces. 1mark b i State Hooke s law 1mark ii Two identical helical springs are connected in series. When a 50g mass is hang at the end of the springs, it produces an extension of 2.5 cm. Determine the extension produced by the same mass when the springs arc connected in parallel. 3marks c i State Boyle s law. 1mark ii Draw a suitable set up that can be used to verify Charles s law. 3marks 14U2 m2S2 X m www.freekcsepastpapers.comPage 87 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 2 PHYSICS Paper 2 TIME: 2HRS Answer all the questions in sections A and B. SECTION A: 25MARKS 1. State one property of image formed by a pinhole camera. 1mk 2. Other than density, state another factor that affect the speed of sound in a solid. 1mk 3. |
1mk 2. Other than density, state another factor that affect the speed of sound in a solid. 1mk 3. A radio wave has a frequency of 3MHz and travels with a velocity of 3.0 x108 m s. Calculate its wavelength. 2mks 4. Draw a circuit diagram to show P-N junction diode in the reverse biased mode. 2mks 5. Explain why the walls of studio are padded with woolen materials 1mk 6. A Define the term radioactivity 1mk b The figure below shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions. The three-emission pass through an electric field Complete the diagram to show the path of each of the emissions. 3mks 7. Explain why radio waves signals are easier to receive in a place surrounded by hills. 2mks 8. State two ways of minimizing electrical power losses during transmission of electric power. 2mks 9. Give a reason why convex mirror is preferred to a plane mirror for use as a driving mirror 1mk 10. State two ways of minimizing local action in a simple cell. 2mks 11. The figure below shows a defect of vision being corrected by concave lens placed infront of the eye. I Name the defect. 1mk ii Complete the rays to show the effect of the lens. 2mks 12. State one use of microwaves. 1mk 13. Determine the speed of light in water given that the speed of light in air is 3.0 x 108 m s and the refractive index of water is 1.33 3mks Radioactive element Glass chamber Lead box To vacuum pump Diverging lenswww.freekcsepastpapers.comPage 88 SECTION B 55 MARKS Answer all questions in this section. 14. A State the Ohm s law 1 mk b Give one factor that affect the resistance of a metallic conductor. 1mk c The figure below shows three resistors connected to 12V supply of internal resistance of 0.2 . Calculate i The effective resistance. 3mks ii The total current in the circuit. |
1mk c The figure below shows three resistors connected to 12V supply of internal resistance of 0.2 . Calculate i The effective resistance. 3mks ii The total current in the circuit. 2 mks d i Define the term doping 1 mk ii Briefly explain how silicon is used to make an p-type semi-conductor. 3 mks iii State one application of a diode. 1mk 15. A Why is the cap of the gold leaf electroscope circular? 1mk b A match stick is lit near the cap of a charged electroscope. State and explain the observation made. 2mks c State one factor that affects the capacitance of a parallel plate capacitor. 1mk d A 10 F capacitor is charged to potential difference of 300V and isolated. It is then connected in parallel to a 5 F capacitor. Calculate: i The resultant potential difference. 3mks ii The total energy in the two capacitors after connection. 3mks 16. A State the Faraday s law of electromagnetic induction. 1mk b Give two factors that affect the magnitude of the induced em.f 2mks c A transformer with primary coil of 400 turns and secondary coil 200 turns is connected to 240 V a.c mains. I Calculate the secondary voltage. 2mks ii If the primary current is 3.0 A and secondary is 5.0A. Calculate the efficiency of the transformer. 3mks d State how the following are minimized in a transformer. 2mks i Hysteresis loss ii Eddy currents e Explain why the alternating voltage is used in a transformer. 1mk 17. A Define the term work function 1mk b Distinguish between thermionic emission and the photoelectric emission. 1mk c State one factor that determines the velocity of photoelectrons produced on the metal surface when light shine on it. |
1mk 17. A Define the term work function 1mk b Distinguish between thermionic emission and the photoelectric emission. 1mk c State one factor that determines the velocity of photoelectrons produced on the metal surface when light shine on it. 1mk d The threshold wavelength of a photo emissive surface is 5.55x10-7 m. Take speed of light C 3.0x108 m s, Planck s constant h 6.63 x10-34 Js and mass of an electron Me 9.1x 10-31kg. Calculate: i Its threshold frequency 3mks ii The work function of the surface 3mks e The maximum speed with which a photoelectron is emitted if the frequency of the radiation is 6.2 x1014 Hz 3mks 2 3 4 12V r 0.2 www.freekcsepastpapers.comPage 89 18. A State one similarity between cathode rays and X-rays. 1mk b Give two uses of X-rays in medicine 2mks c In a T.V set magnetic fields are preferred for use as deflection system instead of the electric field. Explain 1mk d The figure below represents a cathode ray oscilloscope C.R.O . I Name the parts labelled A and C 2mks ii What is the function of part labelled D 1mk iii Explain how electrons are produced in the C.R.O. 1mk iv State the reason why the part labelled F has variable potential difference. 1mk v Give a reason why the tube is evacuated. 1mk A B C F G H 6V D Ewww.freekcsepastpapers.comPage 90 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 3 PHYSICS PAPER 3 212 hours INSTRUCTIONS TO CANDIDATES a Answer ALL questions. B You are supposed to spend the first 15 minutes of the 212 allowed for this paper reading the whole paper carefully before commencing the work. |
E Given that R r1 r2. Calculate R. 2mk f Given that , find the value of n. 3mks g Given that , find the value of k. 2mks h What Physical property does n represent? 1mk www.freekcsepastpapers.comPage 92 PART B g Measure 100 ml of hot water and pour it into the beaker. Place the beaker on the bench. Clamp the thermometer vertically and insert it into the beaker with hot water. H Start the stop-watch when the temperature is 800 C. Record the temperature, after 4 minutes. A .0C. 1mk Convert to in degrees Celsius to temperature T, in kelvin. B T ..K. 1mk i Find the mass, m in kg of water in the beaker given that the density of water is 1000kg m3. 2mks j Given that: where; m is the mass of the water used and the specific heat capacity of water, c 4200J kg K, determine the value of . 3mks k State the significance of . 1mks MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. |
2mks NsNp VsVp 400200 Vs240 Vs 400x240200 480V ii Power output 240x3 720W Efficiency power outputpower input x100 Power input 480x 5 2400W 7202400x100 30 d i Hysteresis loss - using a core of a soft magnetic material eg soft iron ii Eddy currents - laminating the core e It can be stepped up or stepped down. 17. A Minimum amount of energy of radiation light required to dislodge an electron from the surface of a metal b Thermionic emission is the process of emitting electrons from the metal surface due to heat energy while photoelectric effect is the process of emitting electrons from the metal surface by electromagnetic radiation of sufficient frequency energy. C Frequency wavelength energy of the radiation d i threshold frequency 3mks fo C O fo 3.0x1085.55x10 7 fo 5.405 x1014Hz ii The work function of the surface 3mks Wo hfo 6.63x10-34 x 5.405x1014 3.584 x10-19 J e hf hfo 2MeV2 6.63x10-34x6.2x1014 -3.584x10-19 5.266x10-20J 12MeV2 hf hfo V 5.266X10 20X29.1X10 31 3.402X105m s 18. A Both travel in straight line at the speed of light. B Sterilize surgical equipment Killing cancerous cells radiotherapy Radiography c Magnetic fields provide a wider deflection compared to electric fields. D i A-Cathode C-Grid ii Used for vertical deflection of the electron beam iii Thermionic emission-when the cathode is heated electrons on its surface gain enough energy to enable them break loose from the force of attraction from the nuclei. The filament heats up the cathode, causing the electrons to boil off or be emitted from surface. Iv To focus converge the electron beam on the screen. V To prevent electrons from losing energy due to collision with air particles. |
Correct evaluation mk h Refractive index of glass 1mk PART B h a 68. 0 2.0 .0C. 1dp a must b T 273 68 341 ..K. i 1000 0.0001 0.1 kg j 0.1x4200 353 341 240 5040240 21 Js 1 k Rate of energy loss by water power loss by waterwww.freekcsepastpapers.comPage 63 A man pulls on the rope with a horizontal force T. The piece of metal has a weight of 2000 N and is freely pivoted at A. The system is in equilibrium. By taking moments about A, calculate the value of T. 3marks 6. Explain why an aeroplane is likely to take off much earlier than expected when the speed of the wind blowing in the opposite direction to its motion on the runway suddenly increases. 2 marks 7. An aircraft 300m from the ground traveling horizontally at 400m s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of release. Ignore air resistance 3 mks 8. A body of mass 4.0kg held at a vertical height of 500cm is released to travel a long a frictionless curved path as shown in figure 8 Fig 8 The 4.0kg mass strikes another body of mass 6.0kg at rest. Immediately it reaches the horizontal, the two bodies stick together and move in the same direction. Determine the velocity of the bodies immediately after collision. 3marks 9. A tin with a hole is filled with water to a certain height. Water jets out as shown in figure 9 a below. A second identical tin is filled with water to the same height and a block of wood floated as shown in figure 9 b . Fig 9 State the reason why the maximum distance of jet d2 is greater than d1. 1 mark 10. The figure 2 below shows the apparatus used to observe Brownian motion using a smoke cell. I State the observation made in the smoke cell. |
1 mark 10. The figure 2 below shows the apparatus used to observe Brownian motion using a smoke cell. I State the observation made in the smoke cell. 1 mark ii Explain the observation made when the temperature in the smoke cell is increased. 1 mark 11. When a mercury in a glass thermometer is used to measure the temperature of hot water, it is observed that the mercury level first drops before beginning to rise. Explain. 2 marks Mass 4.0kg Mass 6.0kg S Glass cover Microscope Air and smoke particleswww.freekcsepastpapers.comPage 64 12. Figure 3 shows an arrangement of apparatus to study properties of different surfaces. The heater is placed equidistant from the two plates. State what happens when the heater is switched on for some time. 1 mark 13. Explain your answer in question 12 above 1mark SECTION B: 55 marks 14. A The figure below shows the features of a refrigerator. I What is the function of the pump P? 1 mark ii What is the function of the copper fins at the back of the refrigerator? 1 mark iii Explain briefly how cooling takes place in the refrigerator. 3 marks iv What is the purpose of the double wall in a refrigerator? 1 mark b i Define the term latent heat of fusion of a substance. 1 mark ii The figure below shows an apparatus that could be used to determine the specific latent heat of fusion of ice. Fig 12 In order to obtain results that are as accurate as possible, state why it is important to: I. Wait until water is dripping into the beaker at constant rate before taking readings. 1 mark II. Use finely crushed ice rather than larger ones. 1 mark www.freekcsepastpapers.comPage 65 15. A State the law of flotation. 1 mark b Figure 13 below shows a uniform rod of height 8cm floating vertically in a beaker containing two immiscible liquids P and Q. The densities of the liquids are 800kg m and 1200kg m respectively the cross-sectional area of the rod is 2cm . Determine i . The weight of liquid P displaced by the rod. |
The densities of the liquids are 800kg m and 1200kg m respectively the cross-sectional area of the rod is 2cm . Determine i . The weight of liquid P displaced by the rod. 3 marks ii The weight of liquid Q displaced by the rod. 2 marks iii The mass of the rod. 1 mark iv The density of the rod. 2 mks c Figure 14 below shows a block of volume 50 cm3 and density 2 000 kg m3 submerged in a liquid and suspended from a uniform horizontal beam by means of a thread. The beam is balanced by a spherical mass of 40 g, which is suspended from it on the other side of the pivot as shown. Fig 14 Determine the upthrust force acting on the block. 3 marks 16. A State two condition necessary for a driver to negotiate a bend on a banked road at a relatively high speed 2 marks b The figure shows stone of mass 100g whirled in a vertical circle using a thread of length 56cm. Take g 10N Kg www.freekcsepastpapers.comPage 66 If the stone is whirled at a speed of 8m s. Calculate; i The centripetal force experienced by the stone. 3 marks ii Tension force on the string at : I A 2 marks II B 2 marks iii calculate the angular velocity of the stone. 1mark d Figure 15 shows a centrifuge that is used to separate particles suspended in a liquid. Fig 15 Particle of different mass M1, M2 and M3 are suspended in a liquid which they do not dissolve. The system is then rotated in the direction shown. I State why the particles of different masses will acquire different radii as the system is rotated. 1 mark ii If M3 M2 M1, arrange the particle in increasing radii when the centrifuge is rotated for some time. 1 mark 17. A State one condition necessary for pressure law to hold. 1 mark b A bubble at the bottom of a pond expands as it rises to the top of the liquid. Explain. 1 mark c The graph below represents a graph of pressure against temperature, oC. |
1 mark b A bubble at the bottom of a pond expands as it rises to the top of the liquid. Explain. 1 mark c The graph below represents a graph of pressure against temperature, oC. From the graph, determine; i The absolute zero temperature. 1 mark ii The pressure at 373K 1 mark Explain why temperature in i above cannot be achieved 2 marks 100 200 Temp oC Pressure 10 5pa1 2 3 4www.freekcsepastpapers.comPage 67 d A column of air 26cm long is trapped by mercury thread 5cm long. When the tube is inverted, the air column becomes 30cm long. What is the value of atmospheric pressure? 3 marks Explain using kinetic theory of gases why pressure of gases increases as temperature of the gas is increased. 3 marks 18. A Differentiate between work and energy. 2 marks b Describe the energy transformation that takes place when a car battery is used to light a bulb. 1 mark c The figure shows a machine. Gear wheel A with 30 teeth is driven by gear wheel B with 15 teeth. I Determine the velocity ratio of the machine. 2 marks ii If the machine has a mechanical advantage of 0.375, determine the efficiency of the machine. 2 marks d A cart of mass 30kg is pushed along horizontal path by a horizontal force of 8N and moves with a constant velocity. The force is then increased to 14N. Determine:; i The resistance to the motion of the cart. 1 mark ii The acceleration of the cart. 2 marks www.freekcsepastpapers.comPage 68 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 TIME: 2HRS INSTRUCTIONS TO CANDIDATES 1 Answer all questions in section A and B. 2 All workings must be clearly shown 3 Mathematical tables and non-programmable calculators may be used. SECTION A 1. The diagram below shows two steel pins held at the poles of two magnets. 2. The figure below shows an object in front of a plane mirror. |
From the above graph, determine the reflective index of the liquid 3mks c The figure below shows a displacement time graph for a progressive wave i Determine the frequency of the wave 3mks ii Given that the velocity of the wave is 20m s determine its wavelength. 2mks 15. A The figure below shows a magnet being moved towards a stationery solenoid. It is observed that the pointers of the galvanometer deflect. I Give a reason for the deflection of the pointers of the galvanometer 1mk ii State two ways that can be used to increase the magnitude of the deflection of the pointer of the galvanometer 2mks Time seconds Displacement cm Apparent depth cm Real depth cm www.freekcsepastpapers.comPage 71 b The figure below shows a simple electric generator. 1 Name the parts labelled P and Q 2mks 2 The emf generated as the coil rotates is represented in the graph below. Give a reason for the changes in the emf as the coil rotates from 0 to 90 and 90 to 180. 2mk c The primary coil of the transformer has 1200 turns and the secondary coil has 60 turns. The transformer is connected to a 240V a.c source Determine i The output voltage 2mks ii The output current when the primary coil has a current of 0.5A. assume there are no energy losses 2mks 16. A State the differences between cathode rays and electromagnetic radiations 2mks b The figure below shows the main features of a cathode ray oscilloscope CRO i Name the parts labelled M and N 2mks ii State how electrons are produced in the tube 1mk iii When using CRO to display wave fronts of voltages. State where the following should be connected I. Voltage to be displayed on the screen. 1mk II. Time base voltage 1mk III. State why the tube is highly evacuated 1mk c An x ray tube operating at 12KV delivers a current of 8 mA per seconds. |
1mk II. Time base voltage 1mk III. State why the tube is highly evacuated 1mk c An x ray tube operating at 12KV delivers a current of 8 mA per seconds. Calculate the number of electrons hitting the target per second Take 1.6 10 19 C 3mks. Emf V Angle of rotation 180o 360o Spot Fluorescent screen Heated filament Cathode Magnet Magnetwww.freekcsepastpapers.comPage 72 17. A State two ways of minimizing power losses during the transmission of electric Power 2mks b An electronic cooker is rated 2.5kw, 250v. State the meaning of these values 1mk c A consumer has the following appliances in the house Electronic iron rated 1500v A water heater rated 500w An electric cooker rated 2500w Three bulbs each rated 60w The house is filled with 12A fuse. Determine the resistance of the heating element used in the electric cooker 3mks d State how heating is achieved in a resistance wire 1mk e The lighting in a house has 20 lamps each rated 60w, 240 v. Determine the rating of the fuse that maybe used in the circuit. 4mks www.freekcsepastpapers.comPage 73 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS Practical PAPER 3 CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Provide each candidate with the following apparatus. A metre rule A spring balance RANGE ABOVE 2.5 N A mass of 200g 2N with a hook or two 100g masses labelled M A complete retort stand Knife edge support at least 7 cm high Two light strings about 10cm long. QUESTION TWO A nichrome wire mounted on a millimetre scale labelled AB use a wire of diameter 0.36mm A galvanometer. Jockey A carbon resistor labelled X . 10 ohm carbon resistor 8 Connecting wires, 4 with crocodile clips at both ends. |
A metre rule A spring balance RANGE ABOVE 2.5 N A mass of 200g 2N with a hook or two 100g masses labelled M A complete retort stand Knife edge support at least 7 cm high Two light strings about 10cm long. QUESTION TWO A nichrome wire mounted on a millimetre scale labelled AB use a wire of diameter 0.36mm A galvanometer. Jockey A carbon resistor labelled X . 10 ohm carbon resistor 8 Connecting wires, 4 with crocodile clips at both ends. A resistance wire labelled R mounted on a half meter rule use a wire of diameter 0.36mm fixed on half metre rule using cello tape. Ammeter range 0-1 Voltmeter range 0-5 or 0-2.5 One dry cell in a cell holder Micrometre screw gauge Soft board Vernier callipers. Rectangular Glass block of width 6.50 cm Four optical pins. Plain sheet of paper. Two thumb tacks Protractorwww.freekcsepastpapers.comPage 74 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL Paper 3 TIME 2 Hours INSTRUCTIONS TO CANDIDATES a Answer ALL the questions in the spaces provided in the question paper. B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made. E Non-programmable silent electronic calculators may be used. QUESTION 1 You are provided with the following: A metre rule A spring balance A mass M Stand Knife edge support. Two light strings about 10cm long. Proceed as follows: a Use the spring balance to determine weight of mass M N. |
QUESTION 1 You are provided with the following: A metre rule A spring balance A mass M Stand Knife edge support. Two light strings about 10cm long. Proceed as follows: a Use the spring balance to determine weight of mass M N. 1mk b Using the string provided make two loops to be used as hooks L1 and L2 in the diagram. C Suspended the spring balance from a clamp and using one loop to support the rule from the spring so that the loop L2 is on 85cm mark. D Support the other end of the rule with a knife edge at the 10cm mark so that the rule is horizontal. E Using loop 1 suspended the mass M at a distance d 10cm from the knife edge as shown and take the reading of the spring balance, record the results in table 1. F Adjust the distance, d, to 20cm, 30cm e.t.c and each time recording the reading of the balance to complete the table. Table 1 Distance d cm 10.0 20.0 30.0 40.0 50.0 60.0 70.0 Distance d m Force N 3marks g Plot a graph of force F against distance d m 5 marks h From your graph determine: i The slope 3mks ii The value of F when d 0 2mks www.freekcsepastpapers.comPage 75 i Using the information from your graph, determine the constant k and n in the equation below and indicate their units, F 2nd 40k. I N 3mks ii K 3mks QUESTION 2 You are provide with the following - A nichrome wire mounted on a millimeter scale labelled AB - A galvanometer. -. Jockey - A carbon resistor labelled X. - 8 Connecting wires, 4 with crocodile clips at both ends. -. A resistance wire labelled R mounted on a half meter rule - Ammeter - Voltmeter - One dry cell in a cell holder - Micrometer screw gauge Proceed as follows: a Set up the circuit as shown below. I Record the voltmeter reading when the switch is open. |
- 8 Connecting wires, 4 with crocodile clips at both ends. -. A resistance wire labelled R mounted on a half meter rule - Ammeter - Voltmeter - One dry cell in a cell holder - Micrometer screw gauge Proceed as follows: a Set up the circuit as shown below. I Record the voltmeter reading when the switch is open. E 1mark ii Close the switch and record the voltmeter and ammeter readings V and I. V 1mark I 1mark iii Explain why V is less than E. 1mark iv Now connect the voltmeter across the carbon resistor X and record voltmeter reading V1 when the switch is on. V1 . 1mark v Determine X given that X 1 1mark b Using the micrometre screw gauge, measure and record the diameter D of the resistance wire R provided D m 1mark c Now connect another circuit as shown in the figure below. Touch the 10cm mark and the 90 cm mark and see that the galvanometer deflects in opposite direction in each case. I Move the sliding jockey along the resistance wire AB and note the length L1 and L2 where the galvanometer pointer points at the zero mark. Record the values of L1 and L2. L1 m 1mark L2 m 1mark ii Determine the resistance of the resistance wire R using the relationship, 2marks G X L1 L2 10cm mark 90cm mark R B A AV Xwww.freekcsepastpapers.comPage 76 1 2 iii Determine the resistance of the wire R per metre. 1 mark iv Given that, R 0.1114 2 determine the value of S, where R is the resistance per metre. 3mark PART B You are provided with the following; - Soft board - Vernier callipers. -. Rectangular Glass block - Four optical pins. -. Plain sheet of paper. |
3mark PART B You are provided with the following; - Soft board - Vernier callipers. -. Rectangular Glass block - Four optical pins. -. Plain sheet of paper. -. Two thumb tacks - Protractor Procedure; a Measure and record the width t of the glass block using the Vernier callipers provided. T m 1 mark b Fix the white plain paper on the soft board using the two thumb tacks. C Place the glass bock on the paper, trace its outline and label it ABCD, as shown. D Remove the glass block and draw a normal, say at point O. e Draw a line making an angle of 300 with the normal to represent the incident ray. F Replace the glass block carefully to its original position. G Fix two pins P1 and P2 on the line in such a way that they are vertical and at least 4cm apart. H Looking through the glass block through face AB, fix two pins P3 and P4 so that they are exactly in line with the P1 and P2. Mark the positions of P3 and P4 i Join P3 and P4 and produce the line to meet face AB of the block at O1. Join O and O1. Measure angle O1OP. Also, Measure angle OO1P. O1OP 1mark OO1P 1mark ii Measure the perpendicular distance d from the line O1N to OP produced. D m 1mark iii Determine t1 given that, t1 . 3marks iv How do the values of t and t1 compare? |
2marks 4. Figure 3.0 shows a brick of mass 8.0kg standing upright on the ground as shown. 5. What is the pressure it exerts on the ground? G 10Nkg-1 3marks 0 10 5 A Soap film Wire frame Loop of threadwww.freekcsepastpapers.comPage 42 6. The figure 4.0 shows a rod made of wood on one end and metal on the other end suspended freely with a piece of thread so that it is in equilibrium. 7. State the relationship between Physics and Mathematics. 1mk 8. The diagram in fig 5.0 shows a section of a pipe with different cross-sectional area If water flows with a velocity of 10m s in section A, what would be the velocity of water in section? 3marks 9. Determine the spring constant of a spiral spring whose length changes from 10 cm to18 cm when a load of 10.0 N is suspended from its lower end. 3marks 10. Figure 6.0 below shows a wooden sphere with a nail hammered into it as shown. Y The sphere is rolled on a horizontal ground and comes to rest after sometime at point Y. Draw the sphere after it comes to rest at point Y. 1mark 11. When the temperature of an enclosed gas at constant pressure is raised, the volume of the gas increases. Explain how the molecules of the gas cause the increase in volume. 2marks 12. It is easier to stop a saloon car than a bus when both are moving with the same velocity. Explain. 2mrks 13. Figure7.0 a shows a displacement-time graph. Sketch a velocity-time graph on fig.7.0 b 1mk 14. State the law of conservation of energy. 1mk SECTION: 55 MARKS Answer all the questions in this section. 15. A Explain why it is advisable to use a pressure cooker at high altitude. 2marks b Water of mass 3.0 kg initially at 200C is heated in an electric kettle rated 3.0kW. |
15. A Explain why it is advisable to use a pressure cooker at high altitude. 2marks b Water of mass 3.0 kg initially at 200C is heated in an electric kettle rated 3.0kW. The water is heated until it boils at 100oC take specific heat capacity of water 4200Jkg-1k-1, heat capacity of the kettle 450Jkg-1 and specific latent heat of vaporization of water 2.3MJkg-1. Determine: i The heat absorbed by the water. 2marks ii The heat absorbed by the electric kettle. 2marks iii The time taken for the water to boil. 2marks iv How much longer it will take to boil all the water. 3marks The side made of metal is heated with a Bunsen burner flame. State with a reason, the side to which the rod is likely to tilt. 2mks www.freekcsepastpapers.comPage 43 16. A Figure 8.0 shows the same block weighted in air, water and liquid. Given that the reading of the level of water becomes 150cm3 when the metal is fully immersed. Density of water 1000kgm 3 Determine the, i Density of the metal 3marks ii How would you determine the water level before the solid was immersed? 2marks iii Explain why the spring balance gives different reading in fig 8 ii and 8 iii with the same metal block. 2marks b Figure 9.0 below shows a simple hydrometer. I State the purpose of the lead shots in the glass bulb. 1mark ii How would the hydrometer be made more sensitive. 1mark c Figure10.0 shows a cork floating on water and held to the bottom of the beaker by a thin thread. Name the forces acting on the cork. 3marks 17. A When a bus goes around a bend on a flat road, it experiences a centripetal force. |
State two changes that could be made to increase the strength of the electromagnet. 2 marks 5. I The diagram below shows a ferromagnetic material being magnetized by the method shown. Identify the polarity of P 1mk www.freekcsepastpapers.comPage 46 ii On the axes given below, sketch a graph to show how the strength of the magnet being created varies with the number of strokes. 1mk 6. A current of 13A flows through a heating element of resistance 8.5 for 1.5 minutes. Calculate the quantity of heat supplied. 3marks 7. Give a reason why it is not advisable to smoke a cigarette near a charging battery. 1mark 8. A soldier standing between two cliffs fires a gun. He hears the first echo after 2 seconds and the next after 5 seconds. Determine the distance between the two cliffs. Velocity of sound in Air 340m s 3mks 9. I Distinguish between transverse and longitudinal waves. 1 mark ii The figure below shows a wave profile. State the amplitude in SI units 1 mark 10. Two identical sphere A and B each standing on an insulated base are in contact. A negatively charged rod is brought near sphere A as shown below. In what way will A differ from B if separated while the rod is held close to A? 2mks 11. A student was investigating the brightness of bulbs when set up in circuits. He used identical bulbs and cells. He set up circuit A and B consisting of two bulbs and two cells as shown below. 12. A State one condition necessary for total internal reflection to occur 1mk b State one application of total internal reflection. 1mks Strength of magnet Number of strokes A B State and explain which set up had the bulbs brighter 2mks www.freekcsepastpapers.comPage 47 SECTION B 55 MARKS Answer ALL questions in this section. 13. A . On the axes provided, sketch a graph of capacitance against area of overlap of a parallel plate capacitor. 1 mark b i Draw a circuit diagram that may be used to investigate the discharging process of a capacitor. |
A . On the axes provided, sketch a graph of capacitance against area of overlap of a parallel plate capacitor. 1 mark b i Draw a circuit diagram that may be used to investigate the discharging process of a capacitor. 2 marks ii On the axes provided sketch the graph of potential difference between the plates against time for discharging process. 1 mark c The figure below shows three capacitors connected to a 6V battery. Determine; i effective capacitance, 3 marks ii total charge stored, 3 marks iii potential difference across the 4 F capacitor 3 marks d Three resistors of resistances 2.0 , 4.0 and 6.0 are connected so as to obtain the least effective resistance. I Sketch an appropriate circuit diagram for the arrangement. 1 marks ii Determine the effective resistance of the circuit. 2 marks 14. A The figure below shows a human eye with a certain defect. I State one cause of this defect. 1 mark ii On the same diagram, sketch the appropriate lens to correct the defect and sketch rays to show the effect of the lens. 2 marks Time s Potential difference V Area of overlap m2 Capacitance F Retina Eyeball Rays from a distant object Imagewww.freekcsepastpapers.comPage 48 b The figure below shows a parabolic surface with a source of light placed at its focal point F. Draw rays to show reflection from the surface when rays from the source strike the surface at points A, B, C and D. 1 mark c State why convex mirrors are used in supermarkets to check shoplifters. 1 mark d The figure below shows a graph of V1 against U1 for a convex lens of unknown focal length. Use the graph to determine the average focal length ofof the lens, given that fff o When1f and 2fare the values of the focal lengths at of V1 andU1 intercepts respectively. 3 marks 15. A The figure below shows a simplified pin hole camera that was drawn to scale and the image of the object shown on the screen. Imagewww.freekcsepastpapers.comPage 49 The image formed was half the height of the object. |
3 marks 15. A The figure below shows a simplified pin hole camera that was drawn to scale and the image of the object shown on the screen. Imagewww.freekcsepastpapers.comPage 49 The image formed was half the height of the object. I Complete the figure to show the object using a ray diagram. 4 marks ii State other two characteristics of the image. 2 marks iii State one effect on the image when; I. the pin hole was enlarged 1 mark II. The length of the camera was made shorter 1 mark III. The object was taken closer to the pin hole. 1 mark 16. A State the basic law of magnetism. 1 mark b Given a bar magnet, unmagnetised iron bar and a cotton thread; i describe a simple experiment that can be used to distinguish between a magnet and an iron bar. 4 marks ii State with reasons the observations that would be made in the experiment. 4 marks c While demagnetizing two bar magnets that were initially magnetized using electric current the number of identical pins that remained attracted by each magnet at different times was noted and a graph of the number of pins against time was obtained as shown in the figure below for the two magnets, P and Q, one from soft iron the other one steel. I With a reason, identify which graph represented soft iron 2 marks ii Use domain theory to explain demagnetization process. 2 marks 17. A Use the figure below to answer the questions that follows. I Show the direction of the current on the turns when the switch S is closed. 1marks ii State the polarity at P 1marks iii Explain using domain theory what happens on the soft iron bar. 1marks iv If a steel bar was used instead, what could be the difference? 1mark Time s www.freekcsepastpapers.comPage 50 b The following diagram shows a part of an electric D.C. motor. I On the diagram above show the direction of rotation of the coil. 1marks ii State the effect of increasing the number of turns of the rotating coil of an electric motor. |
Motor. I On the diagram above show the direction of rotation of the coil. 1marks ii State the effect of increasing the number of turns of the rotating coil of an electric motor. 1marks c Sketch the magnetic field pattern around the conductor carrying current on figures a and b shown below. 2marks Fig a Fig bwww.freekcsepastpapers.comPage 51 MWAKICAN MJET FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 Practical TIME: 2 HRS INSTRUCTIONS TO CANDIDATES 1. Answer all questions 2. All working must be clearly shown where necessary. 3. Non-programmable silent electronic calculation may be used. Question 1 You provided with the following - 35 paper clips - Optical pin from which the pendulum of a chain of paper clips may be suspended - 2 small pieces of wood or a cork to support the pin or the wire - A complete retort stand and clamp - A stop watch - Half metre rule Proceed as follows a Make a chain to consist of 10 paper clips ensuring that the links are all free to move. Make sure that the paper clips are all the same way up. Using the rule measure the length of one clip. ---------------------------------cm 1mk Set up the pendulum of the chain of paper clips as shown in figure below. B Keeping the chain straight, displace the bottom link of the chain through a small amplitude and release. When the chain swings smoothly in a vertical plane, time 20 oscillations and determine the periodic time T. Enter your results in the table below Number of links N Time for 20 Oscillations t Periodic time T T2 L m 10 15 20 25 30 35 9mks c Make up the chain of paper clips to be 15 links long. Measure and record the new time for 20 complete oscillation. D Repeat the procedure in c above by increasing the number of paper clips by 5 links each time to a maximum of 35 clips. |
Enter your results in the table below Number of links N Time for 20 Oscillations t Periodic time T T2 L m 10 15 20 25 30 35 9mks c Make up the chain of paper clips to be 15 links long. Measure and record the new time for 20 complete oscillation. D Repeat the procedure in c above by increasing the number of paper clips by 5 links each time to a maximum of 35 clips. Enter your results in the table above and complete the values of T2www.freekcsepastpapers.comPage 52 e i On the grid provided, plot a graph of T2 against L 5mks ii Determine the slope of your graph. 3mks S ----------- iii Given that gS find the value of the acceleration due to gravity. 2mks Question 2 PART A 1. You are provided with the following; - One resistance wire mounted on a mm scale - Two dry cells - Switch K - A voltmeter - Three connecting wires with crocodile clips - 3 connecting wires a Set up the apparatus as shown in the diagram below Take off the crocodile clip from the wire AB and close the switch K. Record the reading E of the voltmeter E 1mk b Keeping the crocodile clip attached to the wire AB at a distance L 10cm from A record the reading V of the voltmeter in the table below. Repeat for other values of L shown in the table. Complete the table. 6mks Length L cm Voltage V E -V VEV 10 20 30 40 50 60 c Plot a graph ofVEV against L. 5mks d Determine the slope S, of the graph. 3mks www.freekcsepastpapers.comPage 53 PART B 1. Question one You are provided with the following - A candle - A lens and a lens holder - A screen - A meter rule a Set up the apparatus shown in the figure below. Ensure that the candle flame and the lens are approximately the same height above the bench. |
3mks www.freekcsepastpapers.comPage 53 PART B 1. Question one You are provided with the following - A candle - A lens and a lens holder - A screen - A meter rule a Set up the apparatus shown in the figure below. Ensure that the candle flame and the lens are approximately the same height above the bench. B Set the position of the lens so that it is 0.3m from the candle u 0.3m . Adjust the position of the screen until a sharp image of the candle flame is obtained. Measure the distance V between the lens and the screen. Record the value of v in the table below. C Repeat the procedures in b above for the other values of u in the table 2mks U m 0.30 0.35 0.40 V m uvm d Given that 1 mVP Use the results in the table above to determine the average value of P. 3mks www.freekcsepastpapers.com Page 20 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 1 PHYSICS PAPER 1 THEORY TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES Answer ALL the questions in section A and B. ALL answers and working MUST be clearly shown. Mathematical tables and electronic calculators may be used. Take acceleration due to gravity, g 10m s2 SECTION A 1. Figure 1 below shows a micrometer screw gauge being used to measure the diameter of a metal rod. The thimble scale has 50 divisions. Find the diameter of the metal rod. 1 mark 2. Explain briefly how the temperature in a green house is kept higher than outside. 2 marks The diagram shown in figure 2 below is an arrangement of three pulley wheels used to help in lifting loads. Use it to answer questions 3 and 4. Fig. 2 3. Complete the diagram to show how the rope goes round the wheels, position of the load and the effort. 2 marks 4. Write down the velocity ratio VR of the system. 1 mark 5. State how temperature affects the speed of sound in air. 1 mark 6. |
1 mark 5. State how temperature affects the speed of sound in air. 1 mark 6. State two facts which show that heat from the sun does not reach the earth surface by convection. 2 marks 7. The diagram in figure 3 below shows water with negligible viscosity flowing steadily in a tube of different crosssection area. If at a point A, the cross section area is 120cm2 and the velocity of water is 0.40ms-1, calculate the velocity at B where cross section area is 4.0cm2? 3 marks Fig. 3 8. A motor uses an electrical energy at a rate of 200W and raises a mass of 25kg through a vertical distance of 20m in 0.5 minutes. Determine the efficiency of the motor. 3 marks 9. Name three types of forces that act between bodies not in contact. 3marks 10. How long will it take 240V, 3000W electric immersion heater to raise the temperature of 150 litres of water in a well-lagged calorimeter made of copper of mass 20kg from 150 to 700C? 3 marks Metal rod Fig. 1 B Awww.freekcsepastpapers.com Page 21 11. The diagram shown in the Figure 4 below shows a system in equilibrium with the rule horizontal. AB is a uniform rule of length 1.0m and weight 1.8N. Calculate the weight of the block X. 3 marks 12. State the reason why a trailer carrying heavy loads has many wheels. 1 mark SECTION B 55 MARKS Answer ALL the questions 13. A The figure 5 below shows the displacement time graph of the motion of particle. A State the nature of the motion of the particle between i A and B 1mk ii B and C 1mk iii C and D 1mk b A ball is thrown horizontally from top of a vertical tower and strikes the ground at a point 50 m from the bottom of the tower. Given that the height of the tower is 45m, determine the i Time taken by the ball to hit the ground. |
A The figure 5 below shows the displacement time graph of the motion of particle. A State the nature of the motion of the particle between i A and B 1mk ii B and C 1mk iii C and D 1mk b A ball is thrown horizontally from top of a vertical tower and strikes the ground at a point 50 m from the bottom of the tower. Given that the height of the tower is 45m, determine the i Time taken by the ball to hit the ground. 2mks ii Initial horizontal velocity of the ball 2mks iii Vertical velocity of the ball just before striking the ground. 2mks Take acceleration due to gravity gas 10m s 14. A State the pressure law; 1 mark b Explain how a gas exerts pressure. 2 marks c The figure below shows a set up used to verify pressure law. 15StirrerThermometerHot waterGlassflaskDryairBourdon gauge i State the measurement that may be taken in the experiment. 2 marks ii Explain how the measurement in i above may be used to verify pressure law. 2 marks iii A car tyre is at pressure of 5.0x105 Pa at a temperature of 37 . While it is running the temperature rises to 75 . What is the new tyre pressure? Assume the tyre does not expand 3 marks www.freekcsepastpapers.com Page 22 15. A Distinguish between inelastic and elastic collisions. 2 marks b The diagram in Figure 6 below shows a sphere moving in a viscous liquid in a tall measuring cylinder. I Show on the diagram the forces acting on the sphere. 3 marks ii Sketch a graph showing the variation of velocity with time in figure 7 below. Show on the graph the terminal velocity, VT. 2 marks Time sec Velocity m s 16. A mass of 1kg is attached to a cord of length 50cm. It is whirled in a circle in a vertical plane at 10 revolutions per second as shown in the figure 8 below. A Find the tensions in the cord when the mass is at: i Highest point of the circle A. |
A mass of 1kg is attached to a cord of length 50cm. It is whirled in a circle in a vertical plane at 10 revolutions per second as shown in the figure 8 below. A Find the tensions in the cord when the mass is at: i Highest point of the circle A. 2 marks ii Lowest point of the circle B. 2 marks b The diagram below shows a spring tied to an object, m, and rotated in a circular path of radius, r. i What provides the force that keeps the object moving in a circular path. 1 mark ii The speed of the object is constant but the body is accelerating. Explain. 1 mark Sphere Viscous liquidMeasuring cylinderwww.freekcsepastpapers.com Page 23 iii If the object is whirled faster, what would happen to spring balance reading? 1 mark iv Give a reason for your answers in b iii above. 1 mark v As the object is whirled round the string snaps and cuts off. Describe the subsequent path of the object. 1 mark 17. A State the law of floatation. 1 mark b Figure 9 shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with water. I Indicate and label on the diagram the forces acting on the cork. 1 mark ii Write an expression showing the relationship between the forces above. 1 mark c A solid displaces 8.5cm3 of liquid when floating in a certain liquid and 11.5cm3 when fully submerged in the same liquid. The density of the solid is 0.8g cm3. Determine:- i The upthrust on the solid when floating. 2 marks ii The density of the liquid. 2 marks iii The upthrust on the solid when fully submerged. 2 marks 18. The following results were obtained in an experiment to verify Hooke s law when a spring was extended by hanging various loads on it. |
2 marks iii The upthrust on the solid when fully submerged. 2 marks 18. The following results were obtained in an experiment to verify Hooke s law when a spring was extended by hanging various loads on it. Load N 0.00 1.00 2.00 3.00 4.00 5.00 6.00 Length of spring in cm 10.00 11.50 13.00 14.50 16.00 18.00 24.00 Extension 0.00 I Complete the table for the extension e above. 2mk II Plot a graph of load y-axis against extension 5mks III From the graph determine the spring constant. 2mks IV Calculate the energy stored when the spring is stretched to 16 cm. 2mks www.freekcsepastpapers.com Page 24 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 THEORY TIME: 2 HOURS Instructions to Candidates a Answer ALL the questions in sections A and B. b ALL working MUST be shown clearly c Mathematical tables and silent electronic calculators may be used. SECTION A 25 MARKS Answer ALL the questions in this section. 1. A Distinguish between real and virtual image 1mark b A pinhole camera forms an image of size 10cm. The object is 5m tall and 20m away from the pinhole. Find the length of the pinhole camera. 2marks 2. Why is it safer to carry explosive fuels in metal cans instead of plastic can? 1mark 3. The figure 1 below shows a cross section of a dry cell. Figure 1 i Name the part labeled A 1 mark ii State the use of manganese iv oxide in the cell 1 mark 4. A The figure 2 below shows a soft iron bar that s placed in a coil near a free suspended magnet. State and explain the observation made when the switch is closed. 2marks b Give a reason why attraction in magnetism is not regarded as a reliable method of testing for polarity. 1mark 5. |
State and explain the observation made when the switch is closed. 2marks b Give a reason why attraction in magnetism is not regarded as a reliable method of testing for polarity. 1mark 5. Explain the term wavelength in terms longitudinal wave 1mark 6. A State the effect of pressure on the speed of sound in air. 1mark b A boy stands 190m from a high wall and claps his hands. If he hears an echo1.3 Seconds later, calculate the speed of sound in air. 2marks Awww.freekcsepastpapers.com Page 25 7. Figure 3 below shows an object, O placed 10 cm in front of a concave mirror whose radius, C is 40 cm. On the same figure, draw a ray diagram to show the position of the image formed. 3 marks 8. State any factor that determine the heating effect by an electric current. 1mark 9. Figure 4 shows the table of electromagnetic. Spectrum in the increasing order of wavelengths. P x-rays Q Infra-red a Identify the radiation marked Q 1mark b State the application of radiation marked P 1mark 10. Light travels from glass to air as shown in figure 5. The refractive index of glass 1.5 a Determine angle x 2marks 11. Figure 6 shows air molecules in front of a hollow, wooden box B set vibrating by a tuning fork. Figure 6 i State the reason of mounting the tuning fork on the box which is open at one end. 1mark ii What is the name given to this kind of wave? 1 mark 12. The figure 7 below shows an isolated negative charge placed closer to a negatively charged plate. Draw the electric field patterns. 1mark figure 7 13. Kenya launched the use of optical fibres in communication recently. State why optical fibres are preferred to ordinary cables 1mark X 0 Air Glass n 5 Tuning fork Y Zwww.freekcsepastpapers.com Page 26 SECTION B 55 MARKS 14. |
1mark figure 7 13. Kenya launched the use of optical fibres in communication recently. State why optical fibres are preferred to ordinary cables 1mark X 0 Air Glass n 5 Tuning fork Y Zwww.freekcsepastpapers.com Page 26 SECTION B 55 MARKS 14. A State two ways in which the speed of rotation of a motor can be increased 2marks b The figure 8 below shows a simple electric bell circuit i Name the parts label X and Y 2marks ii When the switch is closed, the hammer hits the gong repeatedly. Explain why: I The hammer hits the gong. 2marks II The hammer hits the gong repeatedly 2marks iii If the armature is made of steel metal, it is observed that the bell will take longer to ring. Explain this observation. 1 mark iv Name two adjustment should be done to the system to make it operate effectively with a lower voltage battery? 2mark 15. A In an experiment to determine the internal resistance of a cell, the following circuit was used. It was noted that when S is open, the voltmeter reads 1.5V and when S is closed the voltmeter reads 1.3V and ammeter reads 0.2A. i Define the term e.m.f of the cell. 1mark ii Determine the lost voltage. 1mark iii Determine the value of R. 2marks iv Determine the internal resistance of the cell. 3marks b Study the circuit below and answer the questions that follow. I Determine the effective resistance of the circuit. 3marks ii Determine the p.d between X and Y. 2marks www.freekcsepastpapers.com Page 27 16. A i Define capacitance of capacitor 1mark ii A positively charged rod with a pointed end is brought near a candle flame as shown fig. 9. Explain why the flame burns in the direction shown 1mark b One of the factors which affect the capacitance of a parallel plate capacitor is the area of overlap of the plates. Name two other factors. 2marks c Calculate the effective capacitance of the capacitors shown across points X and Y. |
Explain why the flame burns in the direction shown 1mark b One of the factors which affect the capacitance of a parallel plate capacitor is the area of overlap of the plates. Name two other factors. 2marks c Calculate the effective capacitance of the capacitors shown across points X and Y. 3marks d A capacitor was full charged to a potential of 40v. The capacitor is connected as shown in the figure below to discharge at load resistor R. Sketch a graph to show how the capacitor discharges with time 2marks 17. A Water waves from a given source move from a deeper a shallow to end. What effect would this have on the; i Frequency 1mark ii Wavelength 1mark iii Velocity of the wave 1mark b . The figure 10 shows wave fronts approaching a wide opening i Complete the diagram to show the appearance of the wave fronts after crossing the opening. 2mark ii State what would be observed on the pattern if the gap was made smaller 1mark c Figure 11 below shows light rays from two coherent sources S1 and S2 falling on screen. Dark and bright fringes are observed between A and B i State the function of S1 and S2 1mark ii State how I. Bright fringes are formed 1mk II. Dark fringes are formed 1mark www.freekcsepastpapers.com Page 28 c . Figure 12 below shows plane water waves incident on a plane reflector placed at an angle to the path of the waves. Complete the diagram to show the reflected waves 2marks 18. A Define the term principal focus for in converging lens 1mark b Sketch on a diagram to illustrate how a convex lens is used as a magnifying glass. 3 marks c In an experiment to determine the focal length of a converging lens using lens formula, several values of image distance corresponding to value of object distance u were determined and a graph of magnification m against image distance v, plotted as shown in Figure 13 The equation of the graph can be represented by the equation m -1 i State the significance of the gradient of the graph 1mark ii From the graph, determine the focal length of the lens. |
Complete the diagram to show the reflected waves 2marks 18. A Define the term principal focus for in converging lens 1mark b Sketch on a diagram to illustrate how a convex lens is used as a magnifying glass. 3 marks c In an experiment to determine the focal length of a converging lens using lens formula, several values of image distance corresponding to value of object distance u were determined and a graph of magnification m against image distance v, plotted as shown in Figure 13 The equation of the graph can be represented by the equation m -1 i State the significance of the gradient of the graph 1mark ii From the graph, determine the focal length of the lens. 3marks iii Determine the value of object distance for which the image is not magnified. 1mark iv An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine the image distance. 3 marks www.freekcsepastpapers.com Page 29 KAPSABET FORM FOUR EXAMINATION, 2023. |
1mark iv An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine the image distance. 3 marks www.freekcsepastpapers.com Page 29 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL CONFIDENTIAL INSTRUCTIONS TO SCHOOLS QUESTION ONE Every student should be provided with the following: - A lens holder - Convex lens of focal length 15.0 cm 1cm - A candle - A white screen - A metre rule - A Equilateral triangular glass prism of side 3.7cm - A plain sheet of paper - A soft board - 4optical pins thumbs - 4 paper pins - A watch glass of diameter 10.0cm 1cm - A piece of plasticine about 20g - A marble of diameter 1.60 cm 0.50cm - A Stopwatch-An electronic balance to be shared - Vernier calipers to be shared - Geometrical set QUESTION TWO - An ammeter 0 1 A - A voltmeter 0 3 V or 0 5 V - A variable resistor of 100 - A 10 carbon resistor - A piece of resistance wire SWG 30 50cm long - Two New Size D dry cells - A cell holder - A switch - Seven connecting wires of 4 should have crocodile clips both ends and 3 with crocodile clip on one endwww.freekcsepastpapers.com Page 30 Figure 1 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL 2 hours INSTRUCTIONS TO CANDIDATES 1. Answer all questions. 2. Non-programmable calculators and mathematical tables may be used. 3. Show all your workings. |
Complete Table 3 3marks Table 3 ii Given that the focal length f of the lens satisfies the equation f 1, determine the average value of the focal length, f. 2 marks QUESTION 2 You are provided with the following: - An ammeter 0 1 A - A voltmeter 0 3 V or 0 5 V - A variable resistor - A 10 carbon resistor - A piece of resistance wire - Two new dry cells - A cell holder - A switch - Seven connecting wires u cm v cm m 30 50 Figure 4www.freekcsepastpapers.com Page 33 Proceed as follows: a Take the resistant wire and coil it around the biro pen to make a coil. B Set up the apparatus as shown Figure 5 below such that the 10 carbon resistor and the coil are in parallel connection. C Close the switch and the adjust the variable resistor such that the ammeter read a current of I1 0.08A and record the corresponding voltmeter reading V1 i V1 1mark ii Calculate resistance VR I 1mark d Repeat c above for current of I2 0.16A and record the corresponding voltmeter reading V2 i V2 1mark ii Calculate resistance VR I 1mark e Find the average value of resistance R 1mark f Determine the resistance, C of the coil 2marks g Now set up the apparatus as shown in Figure 6 below such that the voltmeter is connected across the cells, 10 carbon resistor and the coil are in parallel connection. H Close the switch and the adjust the variable resistor such that the ammeter reads a current of 0.04A and note the corresponding voltmeter reading. Record the value in the Table 4 below. |
A force of 0.6N pulls the block so that it moves with a constant acceleration of 1m s2. Calculate i the time it takes to travel a distance of 200m. 2mks ii the friction force between the block and the table. 2mks 18. The sphere below has a volume of 0.1 litres. It is held with a tight string at the base with of its volume in liquid A of density 380kg m3 while the rest is in Liquid B of density 700kg m3. The tension of the string is 0.32N. A O B Stone A C B 10cm A B Find: a Mass of liquid A displaced. 2mks b Mass of liquid B displaced. 2mks c Upthrust experienced by the sphere. 2mks d Mass of the sphere 2mks e Density of the sphere 2mks www.freekcsepastpapers.com4 KIRINYAGA WEST SCHOOL BASED EXAMINATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 THEORY 2 HOURS Instructions to candidates: a Answer ALL the questions in Section A and B. b All workings must be clearly shown. C Non-programmable silent electronic calculators and KNEC Mathematical tables may be used. SECTION A: 25 MARKS 1. A Figure 1 shows three cardboards; X, Y and Z with holes in positions shown. A bright source of light is placed before cardboard X and an observer observes behind the hole in cardboard Z. State the property of light being investigated in the experiment. 1mk b Figure 2 shows a ray of light incident on a plane mirror striking the reflecting surface as shown. Complete the diagram indicating the value of angle of reflection. 2mks 2. A glass rod is rubbed against a piece of nylon cloth. A State the type of charges acquired by the glass rod. 1mk b Explain how the charges in i above are acquired. 1mk 3. A battery of four cells connected in series produces an emf of 4.8V. Determine the emf of a battery of five such cells. 1mk 4. |
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