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ICSE Class X Prelims 2027 : Physics (St. Marys School ICSE, Mazagaon, Mumbai)

9 pages, 40 questions, 0 questions with responses, 0 total responses,

Eldrick D'souza
St. Mary's School ICSE, Mazagaon, Mumbai
Jr. KG to 10th

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ST. MARY S SCHOOL (ICSE), MAZAGAON, MUMBAI-400010 SUBJECT PHYSICS CLASS: 10 TIME: 2 Hrs. DATE: 23/09/2026 MARKS: 80 SECTION A : (40 Marks) (Attempt all questions from this section) Q. 1 (i) Multiple choice questions. (M.C.Q.) (15) In a closed circuit containing a bulb and a cell, the electromotive force ( ) and the terminal voltage (V) is related as : (Given I is current and r is internal resistance.) (a) V = + IR (ii) (b) V = - Ir (c) V = Ir (d) V = Ir A ray of light is incident normally on a force of an equilateral prism. The ray gets totally reflected at the second refracting surface. The total deviation produced in the path of the ray is : (a) 300 (iii) (b) 600 (c) 900 (d) 1200 For a real image formed by a convex lens, the ratio of I : O = 2 : 5, then the object is : (I is the height of the image and O if the height of the object). (a) between O and F (iv) (b) beyond 2F (c) at F (d) between F and 2F For a lever, a graph is plotted with load on Y-axis and effort on X-axis. Which of the following represents the slope of the graph? (a) Mechanical advantage (b) Velocity ratio (c) 1 / Velocity ratio (d) 1 / Mechanical advantage (v) (vi) What is the correct energy transformation during burning of a candle? (a) heat kinetic + potential (b) heat chemical + light (c) chemical heat + light (d) mechanical chemical + heat The kinetic energy of a given body depends on the : (a) position (b) centre of gravity (c) momentum (d) displacement 1 (vii) Anita used a single movable pulley to lift a bucket of water from a well. She lubricates the pulley. Which of the following statements is true regarding the performance of the pulley used? (a) Mechanical Advantage decreases and efficiency increases. (b) Velocity Ratio increases and efficiency decreases. (c) Mechanical Advantage remains unchanged and efficiency increases. (d) Velocity Ratio remains unchanged and efficiency increases. (viii) A convex lens with a focal length of 12 cm has an object at a distance of 20 cm in front of the lens. A blurred image is obtained on the screen placed at a distance of 23 cm in front of the lens. In order to obtain a clear image, the screen has to be moved : (ix) (a) towards the lens. (b) away from the lens (c) to a position very far away from the lens (d) either towards or away from the lens. In the circuit given below, identify the correct relation between the currents flowing through the 2 , 3 and 5 resistors: (a) current through 2 > current through 3 (b) current through 5 < current through 3 (c) current through 2 = current through 5 (d) current through 5 > current through 3 (x) Which of the following circuits have the same resistance? (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iii) (d) (ii) and (iv) 2 (xi) Three bulbs of equal resistance are connected as shown in figure. Out of the following statements which one is correct? (a) The current at B is greater than that at C. (b) The current at A equals the current at B. (c) The current at C is greater than that at B. (d) The current at A equals the current at C. (xii) Identify the figure which depicts the correct dispersion and deviation of light. (xiii) Which one of the following best represents the variation of the angle of deviation ( ) with the angle of incidence (i) for a triangular prism? (xiv) Assertion (A) : Soldiers avoid firing at a target in foggy weather conditions. Reason (R) : In foggy weather, light gets scattered by tiny water droplets, reducing visibility. (a) both A and R are true and R is the correct explanation of A. (b) both A and R are true and R is not the correct explanation of A. (c) assertion is false but reason is true. (d) Assertion is true but reason is false. 3 (xv) In the given circuits Y and Z, the resistors, R1 and R2, are connected in : (a) series in both the circuits. (b) parallel in both the circuits. (c) parallel in Y and series in Z (d) series in Y and parallel in Z Q. 2 Complete the following statements by choosing the correct answer from the brackets : (6) (a) A pair of scissors is a . [force/speed/efficiency] multiplier. (b) The velocity ratio of a single movable pulley is always [2, 3, 5]. (c) During a basketball game, when a player jumps to make a shot, the kinetic energy is converted into . [gravitational potential energy/sound energy/elastic potential energy] as the player reaches the highest point of drop. (d) One horse power is equal to .. [100 W/746 W/764 W]. (e) Emf of a cell is [greater than/equal to/smaller than] the terminal voltage when the cell is not in use, and [greater than/equal to/smaller than] the terminal voltage when the cell is in use. (ii) Calculate the power spent by a crane while lifting a load of mass 2000 kg. at a velocity of 1.5 ms-1. (g = 10 m/s2) (iii) (2) A non-uniform kite is hanging freely from the branch of a tree as shown. Study the figure and answer the following : (2) (a) Fill in the blanks: (P, Q, R or S) is the most probable position of its centre of gravity. (b) Support your answer to (a) with a reason. (2) Q. 3 (i) (15) A ray of light enters a rectangular glass slab submerged in water at an angle of incidence 550. Does this ray undergo total internal reflection when it moves from water to glass? Justify your answer. (The critical angle for glass-water interface is 540). (2) 4 (ii) (iii) According to the NEW colour convention, which colour of wire is connected to : (a) the metal body of the appliance. (b) the switch of the appliance? (2) A current flows through a metallic conductor for a long period of time. State the change you would expect in its: (2) (a) Resistance (b) Resistivity (iv) What material is used to make resistance wires and why? (2) (v) How fast should a man weighing 600 N run so that his kinetic energy is 750 J? (g = 10 m s-2) (2) (vi) A spring is kept compressed by a toy cart of mass 150 g. On releasing the cart, it moves with a speed of 0.2 m s-1. Calculate the potential energy (elastic) of the spring. (vii) Draw a neat labelled diagram of a block and tackle system of pulleys with VR = 3 (2) (3) 5 SECTION B : 40 marks (Attempt any four questions) Q. 4 (i) (a) Out of the three rays. (I, J, H) shown in the diagram, which ray will suffer Total Internal Reflection while inside the prism? (Critical angle of the prism is 420). (b) (3) Copy the diagram to complete the path of the ray which you have named in (a) till it comes out of the prism. (ii) A rectangular glass block of refractive index 1.5 has an air bubble trapped inside it as shown in the diagram. When seen from the surface AB, it appears to be 4 cm deep. (3) (a) Calculate the actual depth of the air bubble from the surface AB. (b) For which colour of light, blue or yellow, the apparent depth will be greater? (c) Turning the glass block upside down DOES NOT change the apparent depth of the air bubble. State True or False. (iii) (a) An object is placed at 2F position of a convex lens. Draw a ray diagram showing the formation of the image. (4) 6 (b) How will the size of the image if we ONLY replace the lens in the above arrangement with another lens of a greater focal length? Q. 5 (i) An object is placed in front of a concave lens at a distance of 45 cm from it. If its image is formed at a distance of 30 cm from the lens, calculate the focal length of the lens. (ii) (3) Two rays PQ and RS are incident on a rectangular glass block as shown in the diagram. Observe the diagram and answer the questions that follow. (3) Which of these two rays will : (a) have greater lateral displacement on emerging out of the block? (b) travel with greater speed in the block? (c) (iii) (a) scatter more in the atmosphere? Name the radiation : (4) 1. for which a quartz prism is used to study the spectrum. 2. which are used in remote sensing devices. 3. Which are used in traffic signals in India. (b) Q. 6 (i) Name one property common to all electromagnetic radiations. Figure shows I-V graph for two conductors A and B. (3) 7 (i) Which conductor is ohmic? (ii) Which conductor as more resistance? Give reason. (ii) Define super conductors. Give two examples of super conductors. (3) (iii) A cell supplies a current of 2 A when it is connected to a 5 resistance and supplies a current of 1.2 A, if it is connected to a resistance of 9 . Find the e.m.f. and internal resistance of the cell. Q. 7 (i) (4) The diagram below shows two parallel rays A and B of red and violet light respectively incident from air on air-glass boundary. Complete the diagram showing the refracted rays for them in the glass. (ii) (3) (a) How do the speeds of the rays differ in glass ? (b) Are the two refracted rays in glass parallel? Give a reason for your answer. (c) How does the refractive index of glass differ for the two rays? The current through a 12 V tungsten filament lamp connected to a 12 V accumulator of negligible resistance is 3.0 A. Calculate: (i) the resistance of the filament. (ii) The power of the lamp, and (iii) The electrical energy in kWh consumed in 5 hours. (3) 8 (iii) A uniform meter rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end. Draw a diagram of the arrangement. (a) At which end must this mass be suspended ? (b) What is the mass of the rule ? (c) The 10 g mass is now shifted to the 90 cm mark. In which direction must the knife edge be shifted to make the rule horizontal again? (4) Q. 8 (i) A 4 m long rod of negligible weight is supported at a point 125 cm from its one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm. (a) (3) If a weight W is placed at a distance of 250 cm from the support on the longer arm to balance the rod, find W. (b) If a weight 5 kgf is kept to balance the rod, find its position. (c) To which class of lever does it belong ? (ii) Distinguish between Work and Power. (iii) In the diagram given below in figure A, B and C are three ammeters each of negligible resistance. The ammeter B read 0.5 A. Calculate : (3) (4) (a) The readings of the ammeters A and C. (b) The total resistance of the circuit, and (c) The e.m.f. of the cell. 9

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