Upload ICSE - X Physics Board Paper 2024.txt

ICSE - X Physics Board Paper 2024.txt

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+ICSE EXAMINATION PAPER - 2024
+PHYSICS
+Class-10th
+(Solved)
+
+Maximum Marks: 80
+Time allowed: Two hours
+Answers to this Paper must be written on the paper provided separately.
+You will not be allowed to write during first 15 minutes.
+This time is to be spent in reading the question paper.
+The time given at the head of this Paper is the time allowed for writing the answers.
+Section A is compulsory. Attempt any four questions from Section B.
+The intended marks for questions or parts of questions are given in brackets [ ].
+
+SECTION A - 40 MARKS
+
+(Attempt all questions from this Section.)
+Question 1 
+[15]
+		Choose the correct answers to the questions from
+the given options.
+		(Do not copy the questions, write the correct
+answers only.)
+(i) When a bell fixed on a cycle rings, then the energy
+conversion that takes place is
+		(a) gravitational potential energy to sound energy
+		(b) kinetic energy to sound energy
+		(c) sound energy to electrical energy
+		(d) sound energy to mechanical energy
+(ii) A door lock is opened by turning the lever (handle)
+of length 0.2 m. If the moment of force produced is
+1 Nm, then the minimum force required is
+		(a) 5 N
+(b) 10 N
+		(c) 20 N
+(d) 0.2 N
+(iii) A force ‘F’ moves a load from A to C as shown in
+the figure below. For the calculation of the work
+done, which of these lengths would you use as the
+displacement?
+
+		Reason (R): Wavelength of ultraviolet radiation is
+more than the wavelength of microwave radiation.
+		(a) Both A and R are true.
+		(b) A is true but R is false.
+		(c) A is false but R is true.
+		(d) Both A and R are false.
+(vi) When the stem of vibrating tuning fork is pressed on
+a table, the tabletop starts vibrating. These vibrations
+are definitely an example of
+		(a) resonance
+(b) natural vibrations
+		(c) forced vibrations
+(d) damped vibrations
+(vii) Which of the following is a class III lever?
+		(a) Pair of scissors
+(b) Wheelbarrow
+		(c) Crowbar
+(d) Human forearm
+(viii) The specific resistance of a conductor depends on its
+		(a) length
+(b) material
+		(c) area of cross section (d) radius
+(ix) Identify the option that displays the correct wiring
+with correct colour code
+		(a)
+
+		(b)
+		(a) 3 m
+(b) 4 m
+		(c) 5 m
+(d) 7 m
+(iv) A radioactive nucleus containing 128 nucleons
+emits a b-particle. After b-emission the number of
+nucleons present in the nucleus will be
+		(a) 128
+(b) 129
+		(c) 124
+(d) 127
+(v) Assertion (A): Ultraviolet radiations are scattered
+more as compared to the microwave radiations.
+
+Oswaal ICSE PHYSICS, Class-X
+
+2
+(c)
+
+		(c) Latent heat of vaporization
+		(d) Heat capacity
+(xv) A block of glass is pushed into the path of the light as
+shown below. Then the converging point X will
+
+(d)
+
+(x) The potential difference between terminals of a cell
+in a closed electric circuit is
+		(a) terminal voltage
+		(b) electro motive force
+		(c) voltage drop
+		(d) none of these
+(xi) During melting of ice at 0°C the
+		(a) energy is released and temperature remains
+constant.
+		(b) energy is absorbed and temperature remains
+constant.
+		(c) energy is released and temperature decreases.
+		(d) energy is absorbed and temperature increases.
+(xii) Linear magnification(m) produced by a concave lens
+is
+		(a) m < 1
+(b) m > 1
+		(c) m = 1
+(d) m = 2
+(xiii) A radioactive element is placed in an evacuated
+chamber. Then the rate of radioactive decay will
+		(a) Decrease
+		(b) Increase
+		(c) Remain unchanged
+		(d) Depend on the surrounding temperature
+(xiv) The graph given below shows heat energy supplied
+against change in temperature when no energy is
+lost to the surrounding. The slope of this graph will
+give
+
+		(a) Specific heat capacity
+		(b) Latent heat of fusion
+
+		(a) Move away from the slab
+		(b) Move towards the slab
+		(c) Not shift
+		(d) Move towards the left side of the lens
+Question 2
+(i) (a) In the following atoms, which one is a
+radioisotope? Give one use of this isotope.
+			 O16, C14, N14, He4
+		(b) Name the class of the lever shown in the picture
+below:
+[3]
+
+Bottle
+
+(ii) Fill in the blanks:
+[2]
+		(a) When a stone tied to a string is rotated in a
+horizontal plane, the tension in the string
+provides _________ force necessary for circular
+motion.
+		(b) Work done by this force at any instant is
+_________.
+(iii) A non uniform beam of weight 120 N pivoted at one
+end is shown in the diagram below.
+		
+Calculate the value of F to keep the beam in
+equilibrium.
+[2]
+
+(iv) Meera chose to use a block and tackle system of ‘9’
+pulleys instead of a single movable pulley to lift a
+heavy load.
+[2]
+		(a) What is the advantage of using a block and
+tackle system over a single movable pulley?
+		(b) Why should she connect more number of
+pulleys in the upper fixed block?
+(v) Sumit does 600 J of work in 10 min and Amit does
+300 J of work in 20 min. Calculate the ratio of the
+powers delivered by them.
+[2]
+
+Solved Paper - 2024
+(vi) 5 bulbs are connected in series in a room. One bulb is
+fused. It is removed and remaining 4 bulbs are again
+connected in series to the same circuit. What will
+be the effect on the following physical quantities?
+(Increases, Decreases, Remain Same)
+		(a) Resistance
+		(b) Intensity of light
+[2]
+(vii) Rohan conducted experiments on echo in different
+media. He observed that a minimum distance of ‘x’
+metres is required for the echo to be heard in oxygen
+and ‘y’ metres in benzene. Compare ‘x’ and ‘y’.
+Justify your answer.
+		
+Speed of sound in oxygen: 340 ms–1
+		
+Speed of sound in benzene: 200 ms–1
+[2]
+Question 3
+(i) (a) In a reading glass what is the position of the
+object with respect to the convex lens used?
+		(b) Why can we not use concave lens for the same
+purpose?
+[2]
+(ii) A fuse is rated 5 A. Can it be used with a geyser
+rated 1540 W, 220 V. Write Yes or No. Give supporting
+calculations to justify your answer.
+[2]
+(iii) State two factors affecting the speed of rotation of the
+coil in a D.C. motor.
+[2]
+(iv) How much heat is required to convert 500 g of ice at
+0°C to water at 0°C? The latent heat of fusion of ice is
+330 Jg–1.
+[2]
+(v) Copy and complete the nuclear reaction by filling in
+the blanks.
+[2]
+		 92U235 + 0n1 → 56Ba... + ... Kr92 + 3 0n1
+
+SECTION B - 40 MARKS
+(Attempt any four questions from this Section.)
+Question 4
+(i) The image of a candle flame placed at a distance of
+36 cm from a spherical lens, is formed on a screen
+placed at a distance of 72 cm from the lens. Calculate
+the focal length of the lens and its power.
+[3]
+(ii) Below is an incomplete table showing the
+arrangement of electromagnetic spectrum in the
+increasing order of their wavelength. Complete the
+table.
+[3]
+Gamma ray
+
+X-ray
+
+UV
+rays
+
+Visible
+rays
+
+Infrared
+
+A
+
+Radio
+waves
+
+		(a) Identify the radiation A.
+		(b) Name the radiation used to detect fracture in
+bones.
+		(c) Name one property common to both A and Radio
+waves.
+(iii) (a) Why do we use red colour as a danger signal on
+the top of a skyscraper?
+		(b) The diagram below shows the path of a blue ray
+through the prism:
+			 1. Calculate the critical angle of the material of
+the prism for blue colour.
+
+3
+
+		 2. What is the measure of the angle of this prism
+(A)?
+		 3. Which colour should replace the blue ray, for
+the ray to undergo Total Internal Reflection?
+
+		
+		
+
+
+
+[4]
+
+Question 5
+(i) (a) Refractive index of glass with respect to water is
+9
+.
+8
+			
+
+Find the refractive index of water with respect to
+glass.
+
+		(b) Name the principle used to find the value in part
+(a).
+		(c) If we change the temperature of water, then will
+9
+the ratio
+remain the same? Write Yes or No.[3]
+8
+(ii) Light travels a distance of ‘10x’ units in time ‘t1’ in
+vacuum and it travels a distance of ‘x’ units in time
+‘t2’ in a denser medium. Using this information
+answer the question that follows:
+		(a) ‘Light covers a distance of ‘20x’ units in time ‘t1’
+in diamond. ‘State true or false.
+		(b) Calculate the refractive index of the medium in
+terms of ‘t1’ and ‘t2’. 
+[3]
+(iii) A monochromatic ray of light is incident on an
+equilateral prism placed at minimum deviation
+position with an angle of incidence 45° as shown in
+the diagram.
+N
+45°
+Q
+P
+
+60°
+N'
+
+60°
+
+60°
+
+		(a) Copy the diagram and complete the path of the
+ray PQ.
+		(b) State two factors on which the angle of deviation
+depends. 
+[4]
+Question 6
+(i) (a) Define Centre of Gravity. 
+
+[3]
+
+		(b) A hollow ice cream cone has height 6 cm.
+			
+
+1. Where is the position of its centre of gravity
+from the broad base?
+
+			
+
+2. Will its position change when it is filled
+completely with honey? Write Yes or No.
+
+Oswaal ICSE PHYSICS, Class-X
+
+4
+(ii) 
+
+[3]
+
+(iii) In the given diagram, a vibrating tuning fork is kept
+near the mouth of a burette filled with water. The
+length of the air column is adjusted by opening
+the tap of the burette. At a length of 5 cm of the air
+column, a loud sound is heard. 
+[4]
+
+5
+
+Tuning
+fork
+
+		
+Two identical marbles A and B are rolled down along
+Path 1 and Path 2 respectively. Path 1 is frictionless
+and Path 2 is rough.
+		(a) Which marble will surely reach the next peak?
+		(b) Along which path/s the mechanical energy will
+be conserved?
+		(c) Along which path/s is the law of conservation of
+energy obeyed? 
+(iii) Given are two pulleys. 
+[4]
+
+		(a) Copy and complete the labelled diagram
+connecting the two pulleys with a tackle to
+obtain Velocity Ratio = 2.
+		(b) If Load = 48 kgf and efficiency is 80% then
+calculate:
+			 1. Mechanical Advantage.
+			 2. Effort needed to lift the load.
+Question 7
+(i) (a) Name the waves used in SONAR. 
+
+[3]
+
+Water
+
+		(a) Name the phenomenon illustrated by the above
+experiment.
+		(b) Why is a loud sound heard at this particular
+length?
+		(c) If the present tuning fork is replaced with a
+tuning fork of higher frequency, should the
+length of the air column increase or decrease to
+produce a loud sound? Give a reason.
+Question 8
+(i) The voltage - current readings of a certain material
+are shown in the table given below: 
+[3]
+Voltage (V)
+
+10 V
+
+20 V
+
+30 V
+
+Current (I)
+
+2A
+
+3A
+
+4A
+
+		
+Study the table.
+		(a) State whether the conductor used is ohmic or
+non-ohmic.
+		(b) Justify your answer.
+		(c) State Ohm’s law.
+(ii) Below is the diagram of a transformer: 
+[3]
+
+		(b)
+			 In the above diagram Lata stands between two
+cliffs and claps her hands.
+			 Determine the time taken by her to hear the first
+echo.
+		 Speed of sound in air 320 ms–1.
+(ii) (a) Complete the following radioactive reaction:
+234
+X → Y + 42 He → 91
+Z + –10 e
+			
+		(b) Uranium is available in two forms U-235 and
+U-238. Which of the two isotopes of Uranium is
+more fissionable?
+[3]
+
+		(a) Identify the type of transformer.
+		(b) In this type of transformer which of the wire is
+thicker, the primary or the secondary? Give a
+reason.
+
+Solved Paper - 2024
+(iii) Study the diagram: 
+
+[4]
+
+		(a) Calculate the total resistance of the circuit.
+		(b) Calculate the current drawn from the cell.
+		(c) State whether the current through 10 W resistor
+is greater than, less than or equal to the current
+through the 12 W resistor.
+Question 9
+(i) 85 g of water at 30°C is cooled to 5°C by adding
+certain mass of ice. Find the mass of ice required.[3]
+		
+[Specific heat capacity of water = 4.2 Jg–1°C–1,
+Specific latent heat of fusion = 336 Jg–1]
+[3]
+(ii) (a) Why does it become pleasantly warm when the
+lakes start freezing?
+		(b) Water freezes to form ice. What change would
+you expect in the average kinetic energy of the
+molecules?
+
+5
+
+		(c) Which will contain more heat energy 1 g of ice at
+0°C or 1 g water at 0°C?
+[3]
+(iii) (a) State one factor that affects the magnitude of
+induced current in an AC generator.
+		(b) Given below is a circuit to study the magnetic
+effect of electric current. ABCD is a cardboard
+kept perpendicular to the conductor XY. A
+magnetic compass is placed at the point P of
+the cardboard. P1 and P2 are the positions of the
+magnetic compass, before and after passing a
+current through XY respectively.
+R
+N
+X
+P1
+
+A
+D
+
+			
+			
+			
+
+P
+C
+
+B
+
+D.C.
+Supply
+P2
+
+Y
+1. Name the rule that is used to predict the
+direction of deflection of the magnetic
+compass.
+2. State the direction of current in the conductor
+(X to Y or Y to X) when the circuit is complete.
+3. If resistance R is increased, then what will
+be the effect on the magnetic lines of force
+around the conductor?
+[4]
+
+
+
+6
+
+Oswaal ICSE PHYSICS, Class-X
+
+ANSWERS
+SECTION A
+1. (i) Option (b) is correct.
+		
+Explanation: Bell fixed on a cycle rings when
+pressure by finger is applied. So, mechanical energy
+is converted into sound energy.
+(ii) Option (a) is correct
+		
+Explanation: Moment of a force = Force x
+perpendicular distance from the line of action of the
+force
+		 Or,
+1 = F × 0.2
+		
+∴
+F =5N
+(iii) Option (c) is correct.
+		
+Explanation: Displacement should be in the direction
+of force.
+(iv) Option (a) is correct.
+		
+Explanation: Number of nucleons i.e., mass no. does
+not change due to β emission Only atomic number
+will increase by 1.
+(v) Option (b) is correct.
+		
+Explanation: As wavelength decreases, scattering
+increases.
+		 Wavelength of ultraviolet is less than the wavelength
+of microwave.
+		 Hence, scattering of ultraviolet is more than that of
+microwave.
+		 Hence, the assertion is true but reason is false.
+(vi) Option (c) is correct.
+		
+Explanation: When stem of a vibrating tuning fork is
+pressed on a table, the table top starts vibrating due
+to the periodic force applied by the tuning fork. This
+is an example of forced vibration.
+(vii) Option (d) is correct.
+		
+Explanation: For class III lever force is applied in
+between the fulcrum and the load.
+		 In human forearm, elbow is the pivot, bicep muscle
+applies the force and load is placed on the palm.
+Hence, it is a class III lever.
+(viii) Option (b) is correct.
+		
+Explanation: Specific resistance is independent of
+the dimension of the conductor. It depends on the
+material of the conductor.
+(ix) Option (a) is correct.
+		
+Explanation: From mains, blue wire (NEUTRAL)
+should directly reach the appliance and the brown
+wire (LIVE) should reach the appliance through a
+switch.
+(x) Option (a) is correct.
+		
+Explanation: Potential difference between terminals
+of a cell, in open circuited condition, is termed as
+electromotive force. Potential difference between
+terminals of a cell, in closed circuited condition, is
+termed as terminal voltage.
+(xi) Option (b) is correct.
+		
+Explanation: During melting, ice requires latent
+heat (a form of energy) and temperature remains
+constant at its melting point.
+
+(xii) Option (a) is correct.
+		
+Explanation: Concave lens always produces virtual,
+erect image, smaller than the object. Hence, the
+magnification is less than 1.
+(xiii) Option (c) is correct.
+		
+Explanation: Rate of radioactive elements is
+determined by the properties of the nucleus of
+an atom. so, it does not change by environment
+(external factors).
+(xiv) Option (d) is correct.
+		
+Explanation: Slope the graph gives the amount of
+heat required for unit rise of temperature. This is
+termed as the heat capacity.
+(xv) Option (a) is correct.
+		
+Explanation: The light passing through glass slab
+will bend towards the normal and after coming out
+in the air, the light will converge out at a point away
+from the glass slab.
+
+2. (i) (a) C14 is a radioisotope because of the instability
+of the nucleus. Used for carbon dating.
+		 (b) Class II lever.
+(ii) (a) Centripetal
+		(b) zero
+(iii)		The weight of the beam will produce a clockwise
+moment and the applied force F will produce a
+clockwise moment.
+		 Equating the moments of the force,
+			
+120 × 0.2 = F × 0.8
+		
+∴
+F = 30 N
+(iv) (a) Mechanical advantage using a block and tackle
+system of 9 pulleys is 9 whereas the mechanical
+advantage of a single moveable pulley is 2.
+		(b) Increase of number of
+pulley increases
+mechanical advantage.
+WSumit
+600
+tSumit
+(v)		PSumit / PAmit =
+= 10 = 4:1
+300
+WAmit
+20
+tAmit
+(vi) (a) Resistance decreases
+		(b) Current (Intensity of light) increases as resistance
+decreases
+(vii) Applying the formula
+0.1
+			
+d =v×
+2
+		 For Oxygen,
+
+x = 340 ×
+
+0.1
+= 17 m
+2
+
+Solved Paper - 2024
+		 For Benzene,
+
+y = 200 ×
+
+0.1
+= 10 m
+2
+
+		 So,
+x : y = 17 : 10
+3. (i) (a) In between optical centre and focus
+		(b) Because concave lens produces reduced size
+image.
+(ii) No.
+P
+1540
+		 The geyser draws I =
+=
+= 7A.
+V
+220
+		 Hence, 5A rated fuse will blow off for the geyser.
+(iii) Speed of rotation may be increased by
+		 Increasing the number of turns of the armature.
+		 Increasing the applied battery e.m.f.
+(iv) Required heat Q = mL= 500 × 330 = 165000 J
+(v) 92U235 + 0n1 → 46Ba141 + 36Kr92 + 30n1
+
+SECTION B
+4. (i) Using lens formula,
+1 1
+1
+− =
+f
+v
+u
+			
+		 Or,
+
+1
+1
+1
++
+=
+72 36
+f
+
+		Or,
+
+3
+1
+=
+72
+f
+
+		
+∴
+
+f = 24 cm
+1
+100
+		 Power of the lens =
+=
+= 4.17 D
+24
+f
+(ii) (a) Microwave
+		(b) X-rays
+		(c) Both have same speed in vacuum
+(iii) (a) Red colour is used as danger signal because it is
+scattered least due to its longest wavelength in
+visible range. Hence, it is visible from a very long
+distance.
+		(b) 1. Critical angle is 43°
+A
+43°
+90°
+
+Blue
+ray
+
+47°
+43°
+
+		(b) The principle of reversibility
+		(c) No.
+(ii) (a) The statement is false.
+			 Diamond is a denser medium compared to
+vacuum. Hence, in it light cannot cover longer
+distance than that in vacuum.
+10 x
+		(b) Speed of light in vacuum =
+t1
+Speed of light in the medium =
+
+			
+
+10 x
+t
+So, refractive index of the medium = 1
+x
+t2
+=
+
+			
+(iii) (a)
+
+			
+
+Hence, the Refractive index of water with respect
+8
+to glass =
+9
+
+10t2
+t1
+
+		(b) Angle of deviation depends on
+			 l Angle of incidence
+			 l Refractive index
+6. (i) (a) Centre of gravity: Centre of gravity is the
+point where the mass of the whole body appears
+to be concentrated.
+		(b) 1. The centre of gravity from the broad base is at
+h
+6
+a height
+=
+= 2 cm.
+3
+3
+			 2. Yes.
+(ii) (a) Marble A
+		(b) Along both the paths.
+		(c) Along both the paths.
+(iii) (a)
+
+B
+
+C
+2. From the above figure, Angle of prism = 43°
+3. If the blue ray is replaced by indigo or violet,
+there will be total internal reflection.
+			
+Critical angles for indigo and violets are
+less than that of blue. Hence, the angle of
+incidence 43° will be greater than the critical
+angle and total internal reflection will occur.
+5. (i) (a) Refractive index of glass with respect to water
+9
+=
+8
+
+x
+t2
+
+			
+
+133°
+
+			
+			
+			
+
+7
+
+		(b) 1.
+
+Efficiency =
+
+M.A.
+V.R.
+M.A.
+2
+
+			
+
+Or,
+
+0.8 =
+
+			
+
+∴
+
+M.A. = 1.6
+
+8
+
+Oswaal ICSE PHYSICS, Class-X
+
+			
+
+2.
+
+Effort =
+
+Load
+M.A.
+
+			
+
+Or,
+
+Effort =
+
+48
+1.6
+
+			
+
+∴
+
+Effort = 30 kgf
+
+7. (i) (a) Ultrasonic wave
+			
+
+(b) Lata cannot clearly distinguish the sound
+reflected from cliff A. Since the distance is less
+than the minimum distance required to hear
+a distinct echo.
+
+			
+
+So, she will hear the sound reflected from
+cliff B as 1st echo.
+
+			
+
+So, she will hear the 1st echo after time t =
+=
+
+(ii) (a)
+
+2d
+v
+
+2 × 160
+= 1 s.
+320
+
+234
+230
+4
+234
+0
+90 X → 88 Y + 2 He → 91 Z+ −1 e
+
+		(b) U-235
+(iii) (a) Resonance
+		(b) Natural frequency of the air column matched
+with the frequency of the tuning fork.
+		(c) Length of air column should be decrease. Since
+frequency is inversely proportional to the air
+column.
+8. (i) (a) Non-ohmic
+		(b) The resistance is not constant. It increases as
+voltage and current increases.
+		 (c) Ohm’s law:
+			
+
+The flow of current through the conductor is
+directly proportional to the potential difference
+established across the conductor provide its
+physical conditions (like, temperature, pressure,
+density, volume etc.) are constant.
+
+(ii) (a) Step down transformer
+		(b) Wire of secondary coil is thicker because
+secondary current is higher than primary
+current.
+(iii) (a) 10 Ω and 6 Ω are in series. Hence, equivalent
+resistance R1 = 16 Ω.
+			 12 Ω and 4 Ω are in series. Hence, equivalent
+resistance R2 = 16 Ω.
+			 R1 and R2 are in parallel. Hence, the equivalent
+resistance = Req = 8 Ω.
+		(b) Current I =
+
+V
+4V
+=
+= 0.5A
+R eq
+8W
+
+		(c) Current in both the resistors are equal because
+both the arms have same resistance value.
+9. (i) Let the amount of ice = m gram
+		 Heat lost by water = 85 × 4.2 × (30 – 5)
+		 Heat lost by ice = m × 336 + m × 4.2 × (5 – 0)
+		 Applying principle of calorimetry,
+			 85 × 4.2 × (30 – 5) = m × 336 + m × 4.2 × (5 – 0)
+		 Or,
+8925 = 357 m
+		
+∴
+m = 25 g
+(ii) (a) When lake freezes, it released latent heat to the
+atmosphere which warms the atmosphere. So,
+the atmosphere becomes pleasantly warm.
+		(b) Since there is no change of temperature there is
+no change in kinetic energy.
+		(c) 1 g of ice (solid) at 1°C has extra heat in the form
+of its Latent Heat while 1 g of water (liquid) at
+1oC has no Latent heat.
+			 Hence, heat energy in 1 g of ice at 0°C has more
+heat energy than the 1 g water at 0°C.
+(iii) (a) Number of turns in armature may be increased.
+		(b) 1. Maxwell right hand thumb rule.
+			 2. Deflection being clockwise, the direction of
+current is from X to Y.
+			 3. As R increases, current decreases. So, strength
+of magnetic field decreases and hence, the
+density of magnetic lines of force decreases.
+
+
+
+