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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 2... |
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 observatio... |
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 w... |
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 th... |
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 effectiv... |
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 connecti... |
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 ... |
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... |
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 ... |
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 m... |
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 th... |
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 t... |
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 1... |
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... |
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 ... |
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... |
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 ... |
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... |
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 MUMIA... |
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 ci... |
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 ................................................................ |
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 t... |
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... |
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... |
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 1.3k... |
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 ... |
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 te... |
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 mov... |
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. Recor... |
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 metr... |
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 ba... |
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... |
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 h... |
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 vertic... |
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 infla... |
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 measurement... |
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 ... |
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... |
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... |
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... |
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... |
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 Determ... |
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 th... |
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 ener... |
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... |
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 sect... |
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 cap... |
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 const... |
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 ... |
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 carryin... |
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.freekcsepastpaper... |
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... |
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... |
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 obs... |
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 ... |
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. D... |
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... |
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 mo... |
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... |
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 ca... |
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 PRACTI... |
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 E... |
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 d... |
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 lengt... |
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 h... |
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 horiz... |
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 wall... |
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 applicat... |
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. Tak... |
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... |
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 Minim... |
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 m... |
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 temper... |
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 sh... |
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... |
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 to... |
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... |
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... |
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... |
- 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 ... |
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 pla... |
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 suspe... |
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 laten... |
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 ... |
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 tim... |
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 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. 1marks c Sketch the magnetic field pattern around the conductor carrying current on figures a and b shown below. 2marks Fig a Fig bwww.freekcs... |
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 ... |
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 posit... |
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... |
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 ... |
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 ... |
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 Extensi... |
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... |
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 2m... |
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... |
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... |
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 CO... |
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 r... |
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 vol... |
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