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ICSE Class X Prelims 2026 : Physics (Thakur Public School (TPS), Mumbai)

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Science Paper 1 (Physics) 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 the 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 from Section B. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION A (Attempt all questions from this Section.) Question 1 [15] Choose the correct answers to the questions from the given options: (Do not copy the question, write the correct answer only.) (i) When the displacement is normal to applied force then work done is : (a) Infinite (b) positive (c) Negative (d) Zero (ii) The workdone by machine to load luggage in 60s is 1800J. Calculate the power spent by the machine (a) 7200 W (b) 7300 W (c) 8200 W (d) 7300 W (iii) For burning of coal in a thermoelectric station, the energy conversion taking place is: (a) chemical to heat to mechanical (b) chemical to heat to mechanical to electrical (c) chemical to heat to light (d) heat to chemical to mechanical (iv) A body of mass 2 kg fall from height of 5m. How much energy does it possess? ( g - 9.8 m/s2) (a)90 J (b) 95 J (c) 98 J d) 94 J (v) The energy conversion in a washing machine is from: (a) electrical to mechanical (b) electrical to chemical (c) chemical to mechanical (d) chemical to electrical 0 (vi) A ray of light incident at an angle 48 On a prism of refracting angle 600 suffers minimum deviation. Calculate the angle of minimum deviation. (a) 120 (b) 240 (c) 360 (d) 480 (vii) Assertion (A) : If a spring is streched from one side, the size and shape of the spring changes Reason (R) : Unbalanced force acting on the spring changes the size and shape of the spring in the direction of application. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. [TPS-Std. 10- Science-Paper 1 (Physics) - Term 1] This paper consists of 5 printed pages and 1 blank page 1/5 Turn Over (viii) On reducing the focal length of a lens, its power: (a) decreases (b) increases (c) does not change (d) first increases then decreases (ix) If a machine is lubricated with oil (a) M.A increases (b) efficiency increases (c)Both M.A and efficiency increases (d)M. A increases and efficiency decreases (x) If a force of 525 N produces a moment of force of 420 N m, the shortest distance between the point of application and turning point will be . (a) 8cm (b) 8 m (c) 0.8 m (d) 80 m (xi) A single movable pulley is a: (a) Force divider (b) Force multiplier (c) speed multiplier (d) none of these (xii) The S.I unit of moment of force is (a) N (b) N/m (c) Nm (d) Kgfcm (xiii) The deviation produced by an equilateral prism when a ray of light is incident on it, does not depend on (a) Angle of incidence (b) colour of light (c)material of the prism (d) size of the prism (xiv) If the ratio of kinetic energies of A and B is 5:2 then which one of the following gives the mass ratio of the bodies respectively? (a) 5:2 (b) 25:4 (c) 2:5 (d) 4:24 (xv) Assertion (A) : Pencil immersed partly in water appears to be bent. Reason (R) : When light travels from air into water, it slows down, causing it to change direction slightly. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. Question 2 i) Complete the following by choosing the correct answers from the brackets: a) An object is placed at a distance 5cm from a convex lens of focal length 10cm. The image formed is virtual, upright and __________.( diminished/magnified/equal to) b) In position of minimum deviation, the refracted ray inside the prism is _______to its base. (normal/inclined at 450/parallel) c) The short handle oar used in a boat race by boatmen acts as a lever of class ____. (I/II/III) d) Turbine ________energy is converted into _________energy by an alternator. (potential / kinetic / Heat /electrical) e) If a lens is placed in water instead of air, its power ________. (increases /decreases / remains same / can both increase or decrease) ii) What do you understand by the deviation produced by a prism? Why is it caused? iii) If a force is applied on a body, will it always produce torque. Explain. Question 3 (i) State the work-energy theorem. (ii) Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. (iii) How fast should a man of mass 60kg run so that his kinetic energy is 750 J? 2/5 [6] [2] [2] [2] [2] [2] Turn Over (iv) A man weighing 700N runs up a flight of 15 steps each 20 cm high in 5 seconds. Calculate power of the man. [2] (v) Which class lever found in the human body is being used by a boy: a) When he holds load on the palm of his hand, b) When he rises the weight of his body on his toes? [2] (vi) Which energy conversions take place in following when they are working? a) Washing machine b) Microphone [2] (vii) In each of the following cases, where must an object be placed in front of a convex lens so that the image formed is [3] (a) upright and enlarged (b) of the same size of the object (c) inverted and enlarged? SECTION B (Attempt any four questions from this Section.) Question 4 (i) A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in downward direction to raise a load of 4500 N,calculate: a) the velocity ratio. b) the mechanical advantage. c) the efficiency of the system. [3] (ii) A lens forms an erect, magnified and virtual image of an object. a) Name the lens. b) Draw a labelled ray diagram to show the image formation.2 [3] (iii) a) A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? b) Two persons A and B (both having same mass m) went to the top floor of a building of height h. A used the staircase, while B used the lift, what is the difference in their work done? c) Which one of the following is a vector quantity - work, energy, power? [4] Question 5 (i) The figure below shows a man performing free hand exercise. (a) What is the position of centre of gravity now? (b) define Centre of gravity. (c) A circular disc is made up of copper and steel and weight of copper is 5g and weight steel is 10g.On which half does the centre of gravity lie? Justify (ii) (a) What is meant by refraction? (b) The speed of light in air is 3x108 m/s. Calculate the speed of light in glass. The refractive index of glass is 1.5 (iii) Study the diagram given below. (a) Name the lens LL . (b) What are the points O and O called? (c) Complete the diagram to form the image of the object AB. 3/5 [4] [3] [3] Turn Over Question 6 (i) A body of mass 50 kg has the momentum of 3000 kgms-1. Calculate: (a) the kinetic energy of the body. b) the velocity of the body. (ii) State whether the potential energy in each of the following cases increases or decreases: a) A spring is compressed. b) A spring is stretched. c) A body is taken away against the force of gravity. d) Air bubble rises up in a water. (iii) In the given figure, a) What will be velocity ratio? b) Calculate the amount of effort E if the efficiency is 80%. c) What changes can be made in the pulleys to increase its efficiency? [3] [4] [3] Question 7 (i) A pair of scissors and a pair of pliers belong to the same class of levers. [3] a) Which one has a mechanical advantage less than 1? Why? b) State the usefulness of such a machine whose mechanical advantage is less than 1 (ii) a) What is meant by the term critical angle ? [4] b) How is related to the refractive index of the medium? c) Does the depth of a tank of water appear to change or remain the same when viewed normally From above? Justify. (iii) Copy the diagram given below and complete the path of light ray till it emerges out of the prism. In your diagram mark the angles wherever necessary. [3] a) Name the phenomenon which the ray suffers at the BC. Question 8 i) In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find: a) the mechanical advantage, b) the velocity ratio, and c) the efficiency ii) A glass slab is placed over a page on which the word VIBGYOR is printed with Each letter in its corresponding colour. a) Will the image of all the letters be in the same place? b) If not, state which letter will be raised to the maximum. Justify your answer. c) Which colour of light has a higher critical angle? iii) The diagram given below shows a block and tackle system of pulleys used to lift a load a) How many strands of tackle are supporting the load? b) What is the mechanical advantage of the system? c) When load is pulled up by a distance 1m, how far does the effort end move? d) How much effort is needed to lift a load of 100 N? 4/5 [3] [3] [4] Turn Over Question 9 (i) (a) You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and concave lens? (b)When does a ray falling on a lens pass through it undeviated? [3] ii) In the diagram given below, a ray of light PQ is incident normally on the hypotenuse of an isosceles right angled prism ABC. [3] (a) Complete the path of the ray PQ till it emerges from prism. (b) Mark in the diagram the angle wherever necessary. (b) What is the angle of deviation of the ray PQ? (c) Name a device in which this action is used? iii) a) A block and tackle system has velocity ratio 3. Draw a labelled diagram of the system indicating the points of application and the directions of load L and effort E. A man can exert a pull of 200kgf. [4] b) What is the maximum load he can raise with this pulley system if its efficiency is 60%? c) If the effort end moves a distance 60cm. What distance does the load move? 5/5 Turn Over

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