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ICSE Class X Question Bank 2025 : Physics

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Arya Limaye
Ambassador School, Dubai

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PRELIMS MOCK 4 PHYSICS Time 2 hours Marks 80 SECTION 1 (40 MARKS - Answer all questions) Question 1 Choose the correct answers to the questions from the options given: 1. The diagram alongside shows a force of 5 N acting at a point A and producing a moment of 6 N about O, the diameter of the wheel is a. b. c. d. 1.0 m 4.6 m 2.4 m 3.4 m 2. A beam of electrons has energy of 1 joule. How many electrons are there in the beam? a. 1.5 x 1018 electrons b. 2.75 x 1018 electrons c. 4.95 x 1018 electrons d. 6.25 x 1018 electrons 3. Perpendicular distance between two forces is called a. Moments b. Couple arm c. Both d. None 4. The SI unit of power is watt. It is expressed in terms of mass, length and time as a. kg m2 s-3 b. kg m s-3 c. kg2 m2 s-2 d. kg ms-2 1 5. Heat energy supplied during melting of a substance is utilized for a. volume expansion b. increasing kinetic energy c. increasing potential energy d. all the above. 6. Magnetic field inside a long straight solenoid carrying current is a. zero b. decrease as we move towards its end c. same at all points d. increase as we move towards it ends. 7. Which of the following is not true for a machine a. It can multiply force b. It can increase speed c. It can change the direction of applied force d. Its output can be more than its input 8. A wire is carrying current out of the page. Which diagram is correct? 2 9. Sound energy passing per second through unit area held perpendicular is called a. Frequency b. Amplitude c. Intensity d. Quality 10. If in the given arrangement the three resistors are to be replaced by a single resistor the value of the resistor will be a. b. c. d. 4 6 9 18 11. The front face of a circular loop of wire is north pole, the direction of current in this face of the loop will be a. Clockwise b. Anticlockwise c. Towards north d. Towards south 12. The least resistance obtained by using 2 W, 4W, 1W and 100 W is a. <100 W b. <4 W c. <1 W d. >2 W 13. An object in a denser medium when viewed from a a rarer medium appears to be raised. The shift is minimum for a. Red light b. Violet light c. Yellow light d. Green light 14. A sledge is pushed up a hill with a force F. The work done of the sledge seldom depends on the force applied and on the distance moved. Which distance? 3 a. b. c. d. X Y Z X+Z 15. Optical fibres use the phenomenon of a. Atmospheric refraction b. Reflection from plane surface c. Total internal reflection d. None of the above Question 2 (2 marks each except for the marked) a. (i) If the highest note detectable by a human ear has a frequency 20 kHz, find the shortest wavelength which the human ear can detect? Take the velocity of sound as 330 m/s. (ii) Name the waves which has the wavelength shorter than this shortest detectable wavelength. (3 marks) b. 0.5 kg of lemon squash at 30 C is placed in a refrigerator which can remove heat at an average rate of 30Js-1. How long will it take to cool the lemon squash to 5 C? Specific heat capacity of lemon squash is 4200 Jkg-1K-1. c. What is the similarity and difference between the electron and beta particles? d. Which type of lever can be used for all three purposes (force multiplier, speed multiplier and change direction)? Explain the reason. e. Which liquid is preferred as a coolant in the radiators of automobiles and why? 4 f. Calculate equivalent resistance between a and b g. What is the significance of holes at various length in a flute? Question 3 (5 x 2 = 10 marks) a. Stone placed at the bottom of a water tank appears raised by 80 cm. If the refractive index of water is 4/3, find the actual depth of water in the tank. b. If the critical angle of the glass for a particular colour of ray shown below is 45 , redraw the diagram replacing the incident light with (a) red light and (b) violet light c. A lens produces a real and inverted image 2.5 times magnified at a distance of 25cm from the lens. Calculate the focal length of the lens. d. Which radiations are used for taking photographs at night? Why? e. The refractive indices of water and glass are 4/3 and 3/2 respectively, in which of the two does light travel faster? What is the ratio of speeds of light in these two media? SECTION B - 40 marks Question 4 (3 + 4 + 3 = 10 marks) a. Copy the ray diagrams and find the type of lens and its focal length. 5 b. The diagram below shows (a) displacement-time, and (b) displacement-distance graph of a wave travelling in a string with velocity 20 ms-1. In each case use the graph to calculate the frequency and wavelength of the wave. c. Answer the following questions: i. What is the relation between volt, joule and coulomb? ii. A cell has an emf E in volt and internal resistance of r in ohm. When a resistance of 2 W and 5 W are connected in turns across the terminals, a current of 0.5A and 0.25 A respectively flow through the circuit. Calculate the values of E and r . Question 5 (4 + 3 + 3 = 10 marks) a. Complete the following diagrams assuming critical angle to be 42 6 b. An electric bulb rated 200W 200V is immersed in 200g of liquid of specific heat capacity 0.8 Jg-1 C-1 at 10 C. The bulb is switched on for 2 minutes. If all the electric energy is absorbed in the form of heat energy by the liquid, calculate; i. Resistance of the filament of the bulb ii. Current flowing through the bulb and iii. Final temperature of the liquid c. A block and tackle has 5 pulleys. Rohan exerts a pull of 150 kgf. What is the maximum load he can raise with this pulley if its efficiency is 75%? Question 6 (3+ 4 + 3 = 10 marks) a. A 4 m long rod of negligible weight is to be balanced about the 125 cm mark from one end. A load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm. A weight W is placed 250 cm from support on the longer arm. Find (i) W. (2) If W = 5 kgf, where must it be kept to balance the rod. b. Calculate the amount of ice, which is sufficient to cool 150g of water, contained in a vessel of mass 50g and specific heat capacity of 0.4 Jg-1 C-1 at 30 C, such that the final temperature of the mixture is 5 C. c. A person is standing between two parallel cliffs that are separated by a distance of 1000 m. He claps his hands and hears the first echo after 2 s. If the speed of the sound is 330 m/s, after how much time will he hear the second echo? Question 7 (3 + 4 + 3 = 10 marks) a. Answer the following questions i. Why are alpha particles not used in radiotherapy (1) ii. Which of the following is radioactive in each pair? (1) iii. In the following reaction, find the values of A and Z for X3. 7 b. In the diagram below i. ii. iii. iv. State the polarities at end A and B. How can the polarities mentioned by you in (i) above be reversed? How can the strength of the magnet be increased? State one area where the above arrangement can be put to good use? c. What happens to the kinetic energy when i. Mass of the body is doubled at constant velocity. ii. Velocity is doubled at constant mass. iii. Mass of body is doubled but velocity is reduced to half. 8

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