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ICSE Class X Prelims 2026 : Physics

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THE BISHOP S CO-ED SCHOOL, UNDRI. FIRST PRELIMINARY EXAMINATION (2024-25) PHYSICS TIME: 2 HOURS CLASS: X TOTAL MARKS: 80 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 reading the question paper. The time given at the head of this paper is the time allowed to write the answers. _________________________________________________________________ Attempt all questions from Section A and 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. Choose the correct answers to the questions from the given options: [15] (i) The diagram shows a circuit in which points A, B, C, and D are marked. Choose the point in the circuit where the current is the smallest. (a) A (b) B (c) C (d) D (ii) The figure shows a circuit diagram connecting 16 LEDs. Which of the following describes how the LEDs are connected in the diagram? (a) All in series (b) All in parallel (c) 8 each in series combination, and the two combinations in parallel (d) 8 each in parallel combination, and the two combinations in series (iii) A convex lens is mounted in an erect position on the table. An object is placed between the optical centre and the focus of the lens. The image through the lens will be: (a) real and diminished (b) real and enlarged (c) virtual and diminished (d) virtual and enlarged (iv) Identify the emissions emitted from a source passing into the electric field between two charged plates as shown in the diagram: (a) Gamma rays, Beta particles (b) Gamma rays, Alpha particles (c) Beta particles, Alpha particles (d) neutrons, Gamma rays (v) Choose the combination of identical resistors which gives the lowest resistance. (a) A (b) B (c) C Page1/6 (d) D (vi) In a house's electric circuit, why is the switch for any device always connected to the live wire? (a) In the neutral wire of the device, no current flows (b) On connecting the switch in the earth wire, the device will be shorted (c) The device can be isolated completely by connecting the switch to the live wire. (d) The device can never be switched off on connecting the switch to the neutral wire. (vii) Identify the correct pair (physical quantity, unit) from the following: (a) Moment of force, Nm-1 (b) Power, kWh (c) Momentum, kgms-2 (d) Work, kgm2s-2 (viii) Choose the incorrect statement: The loudness of sound heard at a place: (a) is directly proportional to the square of amplitude (b) depends on the surface area of the vibrating body (c) varies inversely as the square of distance from the source (d) does not depend on the density of the medium (ix) Which of the following would cost the maximum if operated at the same voltage? (a) a 100 W bulb used for 1 day (b) a 1 kW grinder used for 10 minutes (c) a 500 W electric iron used for 1 hour (d) a 5kW electric cooker used for 1 minute (x) Assertion: In an AC generator, a current is induced in the coil as the coil rotates between the poles of a permanent magnet. Reason: The force due to the magnetic field makes the coil rotate in an AC generator. (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 the reason is true. (d) Assertion is true but reason is false. (xi) As shown in the diagram, a lens forms a blurred image of an object on a screen. How can the image be made sharp and in focus on the screen? (a) By using a brighter object at the same position (b) By moving the object away from the lens and the screen (c) By using the lens of a larger focal length (d) By moving the screen away from the lens and the object. (xii) A ray of light enters a glass block at an angle of incidence i producing an angle of refraction r in the glass. For different values of angle of incidence, angles of refraction are measured, and a graph of sin i against sin r is plotted. Which of the following graphs is correct? (a) Option A (b) Option B (c) Option C Page2/6 (d) Option D (xiii) A beam of electrons is entering into a magnetic field as shown in the diagram. The direction of the field is into the page. What will be the initial direction of the deflection of the electrons as the beam passes through the field? (a) into the page (b) towards the top of the page (c) towards the bottom of the page (d) out of the page (xiv) What is the correct order of increasing wavelengths of electromagnetic waves shown in the options given below? (a) radio waves, visible light, X-rays (b) radio waves, X-rays, visible light (c) X-rays, visible light, radio waves (d) X-rays, radio waves, visible light (xv) A metallic block is to be lifted using a wheelbarrow. The total mass of the block and the wheelbarrow is 60 kg. The acceleration due to gravity is 10 Nkg-1. What is the magnitude of the force F required just to lift the loaded wheelbarrow? (a) 430 N (b) 350 N (c) 600 N (d) 840 N Question 2 (i) Complete the following by choosing the correct answers from the bracket. [6] (a) Of the three connecting wires in a household circuit, the two wires that are connected at the same potential are ___________. (live- earth, neutral- earth, liveneutral) (b) The direction of induced e.m.f, is given by _________. (Fleming s left-hand rule, Lenz s law, Right-hand rule) (c) ___________ (alpha, beta, gamma) has the highest ionizing power. (d) The electrical energy consumed by a bulb of 40 W for 12.5 hours every day for 30 days is __________. (5kWh, 15kWh, 30 kWh) (e) Light waves pass from air into glycerin and are refracted. _______ (Wavelength, direction, frequency) always remains constant when this happens. (f) A couple produces __________ (pure linear motion, pure rotational motion, both linear and rotational motion). (ii) You have been provided with a solenoid AB. [2] [1.] What is the polarity at A [2.] Give one advantage of an electromagnet over a permanent magnet (iii) A radioactive nucleus undergoes a series of decays according to the sequence: If the mass number and atomic number of X3 are 172 and 69 respectively, what is the mass number and atomic number of X? Page3/6 [2] Question 3 (i) (a)Name a device used to convert 12V a.c to 220V a.c. (b) Name the principle on which it works. [2] (ii) For the same kinetic energy of a body, what should be the change in its velocity if its mass becomes four times? [2] (iii) (a) On oxidising a radioactive substance, what change would you expect to take place in the nature of its radioactivity and why? (b) A radioactive decay is represented by an incomplete equation as shown. [2] 233Pa ------------------ 233U 91 92 In this decay, why does the nucleus change? (iv)A man standing 25 m away from a wall produces a sound and receives the reflected sound. [2] (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350ms-1. (b)Will the man be able to hear a distinct echo? Give a reason for your answer (v)The V-I graph for series and parallel combination is shown in the figure. [2] Identify which of the two A or B is a parallel combination. Give a reason for your answer. (vi) A lamp has a power rating of 100W-230V. Calculate the electrical energy supplied to the lamp in half an hour in: (a) S.I. unit (b) Commercial unit [2] (vii) A uniform metre rod of weight 50 gf is balanced at 40cm mark. A weight of 100gf is suspended at 5 cm mark. Where must a weight of 80 gf be suspended to balance the metre rod? [3] SECTION B (Attempt any four questions from this Section) Question 4 (i) By using a block and tackle, a man can raise a load of 72 kgf by applying an effort of 2 x 107 dyne. (Take g= 10N/kg) Find: [3] (a) the mechanical advantage (b) the man s useful power output if he raises the load through 20m in 1.5 minute (ii) State three differences between a Nuclear Fission and a Nuclear Fission. [3] (iii) Figure shows a glass slab of uniform thickness lying horizontally. (Refractive indices of glass and water are 3/2 and 4/3) Above it is a layer of water. A ray of light AB is incident on the lower surface of glass which is refracted successively at B, C and D, the points where it crosses the interfaces. Calculate: Page4/6 (a) sin x (b) sin y (c) Refractive index for light passing from glass to water [4] Question 5 (i) A light-emitting diode glows at some distance on one side of the glass box. An identical inverted image of the LED is formed on the screen at 20cm on the other side of the box. [3] (a) Name the optical device inside the glass box. (b) Find its Power? (ii) (a) Name the material used in a fuse wire. (b) State the characteristics of a fuse wire. (c) Where is the fuse placed in an electric circuit? [3] (iii) Three resistors are connected to a 6 V battery as shown in the figure. Calculate: (a) the equivalent resistance of the circuit. (b) the total current in the circuit (c) the potential difference across the 7.2 ohm resistor (d) the potential difference across the 8 ohm resistor. [4] Question 6 (i) (a)Ultraviolet bulbs have quartz envelope instead of glass. Why? (b) Which radiation can be detected by a silver chloride solution? (c) Overexposure of which radiation causes skin cancer? [3] (ii) The diagram shows a wave of frequency of 50 Hz. The numbers on the diagram represent distance in cm. Find: [3] (a) Wavelength (b) Amplitude (c) Velocity (iii) (a) Name the two factors on which the magnitude of induced e.m.f. depends. (b) In the following diagram, an arrow shows the motion of the coil towards the bar magnet. (1) State in which direction the current flows in the coil, A to B or B to A? (2) Name the law used to arrive at the conclusion. [4] Question 7 (i) (a) What happens to the resistivity of a semiconductor with the increase in temperature? (b)What happens to the specific resistance of a conductor if its length is doubled? (c)Name a substance whose specific resistance remains almost unchanged with the increase in its temperature. [3] Page5/6 (ii)When a tuning fork, struck by a rubber pad, and is held over a length of air column in a tube, it produces a loud sound for a fixed length of the air column. (a) Name the above phenomenon. (b) Compare the frequency of the loud sound with that of the tuning fork. (c) State the unit for measuring loudness. [3] (iii) (a) Copy and complete the diagram showing the correct connection of the tackle, and the direction of the forces involved to obtain maximum V.R. with the convenient direction. [4] (b) Calculate the M.A. of the pulley system if its efficiency is 80%. (c) Calculate the effort needed to lift a load of 480 N using this system. Question 8 (i)(a) Which of the two wires, copper or nichrome of similar dimensions would you use for the electric heater element? Give a reason for your answer. (b)Two fuse wires of the same length are rated 5A and 20 A. Which of the two wires is thicker and why? [3] (ii) A lens of focal length 15 cm forms an image on the screen of size three times that of the object. (a) What kind of lens is this? (b) Find the position of the object and the position of the screen. [3] (iii) The diagram alongside shows a light source P embedded in a rectangular glass block ABCD of critical angle 42o. [4] (a) Copy the diagram and show the final path of the ray of light. (b) What is the angle of incidence at the surface BC? (c) What is the angle of refraction at the surface CD? Question 9 (i) Tony wants to connect a fuse to his oven. He wants to control the oven from two different locations. Shown alongside is his circuit diagram. [3] (a) Which one of the two, A or B should be a live wire? (b) In the event of an overload, will the fuse serve its purpose? Give a reason for your answer. (ii) (a) A coin kept inside water ( = 4/3), when viewed from air in a vertical direction, appears to be raised by 3 mm. Find the depth of the coin in water. (b) How is the critical angle related to the refractive index of a medium? [3] (iii) (a) Complete the following diagram of the figure of a transformer and name the parts labelled A and B. (b) Is this transformer a step up or step down? Give a reason. (c) Name any one kind of loss of energy in this device. [4] ******************************************************************** Page6/6

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