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ICSE Class X Mid-term 2025 : Physics

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VIVEKANANDAMISSION SCHOOL SELECTION EXAMINATION CLASS -X(ICSE 2025) PHYSICS (SCIENCE PAPER 1) Time: 2Hrs FullMarks: 80 Answers to this Paper must be writen on the paper provided separately.You will notbe 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 Ais compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questionsare given in brackets []. SECTIONA (Attempt allquestions from this Section) Question 1 Choose the correct answers to the questions from the given options. [15) (Do not copy the question, write the correct answers only.) () If handle of a door is connected at the middle of the door, then: (a) turning effect on the door will be very large (b)less force is needed to produce greater turning effect (c) more force is needed to produce greater turning effect (d) turning effect won't be produced ( ) Position of centre of gravity of a body of given mass depends on its: (a) shape (b) volume (c) mass distribution (d) both (a) and (c) correct Ahalf meter rule suspended at the middle, balances horizontal when a 50gf weight and an unknown weight Wis suspended at 10cm and 45cm mark respectively. The value of Wis (iv) (a) 66.6gf (b) 37.5gf (c) 48.6gf (d) 57.6gf Power ofa body can be expressed as (a) Workx time (b) Forcex velocity (c) Force/velocity (d) Force/time Abody of mass mis moving with velocity 'u'. On applying a force 'F, its velocity increases to 'v. Work done by the force then is (a) m (v -u?) (vi) (b) m (u - v ) (c) F (v-u) (d) F (u-v) In the given graph of energy(E) vs height(H), for a free falling body, the line represents (a) Loss in KE (b) Gain in KE (d) Sum of KE and PE (c) Gain in PE (ii) Acook usinga fire tong of length 28cm lifts a piece of burning coal of mass 250gm. If he applies his effort at a distance of 7cm from fulcrum point, then effort applied is (g=10m/s) (a) 10N (d) 0.625N (b)5N (c) 1N (vii) Assertion(A): Athick wire has larger resistance than a thin wire of same material. Reason(R): Resistance of a wire depends on its area of cross section. (a) both Aand Rare true and Ris the correct explanation of A. (b) both Aand Rare true and Ris not the correct explanation of A. (c) Ais false but R is true (d) A is true but R is false (IN) During refraction, iflight ray is bending away from the normal, it means the ray is travelling from (a)air to water (b) water to glass (c) water to air (d) vacuum to air In the given figure if LL' is a convex lens, then the mage will be formed Object (xi) (xii) (a) between F and 2F on other side of the lens (b) beyond 2F on the same side of object (c) beyond 2F on other side oflens (d) between lens and F on other side of the lens. Two waves of same pitch have amplitudes in the ratio 1:3. The ratio of their frequencies will be (a) 1:3 (b) 1:9 (c) 9:1 (d) 1:1 A man fires a gun and hears its echo after 5secs from a hill. He then moves 310m towards the hill and fires again and hears its echo after 3secs. The speed of the sound is then (a) 310m/s (b) 330m/s (c) 340m/s (d) 380m/s (i) The graph ofvoltage(V) vs current for four different materials are as shown. Which of these four materials would be used for making filament of a bulb? vt (a) P (x v) (b) Q (c) R (d) s Ametal wire has a resistance of 602. It is then cut into three equal parts. If two parts joined in parallel now with the third part is in series with them, then the equivalent are resistance becomes (xv) (a) 252 (b) 302 MCB is a kind of (a) fuse (b)switch (c) 6092 (d) 752 (c) earthing device (d) distribution device Question 2 ) Complete the following by choosing the correct answers from the bracket A (convex, concave, concave convex] lens always forms a virtual image. b. In ablock and tackle system, increase in the weight of the movable block [decreases, a. does not affect, increases] the efficiency of the pulley system. C. Heat energy is converted into mechanical energy in felectric heater, steam engine, solar cell) d. Athick copper wire will always have same [Resistance, Resistivity, Potential difference ]with that of a thin copper wire, both of same length. e. Uniform circular motion is [accelerated, non-accelerated, variable speed] motion f. Amplitude of resonant vibration is (i) [small, large, same] as compared to amplitude of forced vibration. What will happen to the focal length of a glass convex lens if a. Halfof the lens is covered with black paper b. The lens is immersed in water (ii) Two bulbs marked 100W-220V and 50W-220V are connected in parallel across 220V supply. Explain why 100W bulb will glow brighter, when the circuit is switched on. Question3 () (i) State two conditions for a body acted upon by several forces, to be in equil brium. [2] A ball is dropped trom rest from a height of 60m.On striking the ground it rebounds to a height of 45m. What percentage ofinitial energy is lost then, while rebounding? (2] Why mechanical advantage of aclass Il type lever is always greater than one? What is the use of such type? (iv) (2] A light rayof yellow colour is incident on an equilateral glass prism at 48 , suffering a deviation of 36 andemerges out of the prism at 48 only. State: [2) (a) The relation between angle of refraction (ri) at the first surface and angle of incidence (ra) on the second surface of the prism in the above mentioned case. (b) Ifthe incident angle now becomes 60, whether deviation produced by the prism will be greater than, less than or equal to 360? (v) State the sign/value of the power of aconvex lens made up of material of r.i.pwhen placed (a) in amedium having r.i. 1> (b) in a medium having r.i. u2 = How do bats avoid obstacles in their way, when in flight? In the shown figure, if the ammeter reads 0.5A then calculate (vi) (vii) [2] (2] [31 6.0 V (a) Value of R (b) Charge passing through 32 resistor in 2 mins (c) Power dissipated across RQ 39 R SECTION B (Attempt any four questions from this Section.) Question 4 () The figure below shows a uniform meter rule AB is pivoted at zero mark and supported at other end Bby aspring balance, with 40kgf suspended at 40cm mark. If the ruler stays horizontal then find the reading of the spring balance if the massof the ruler is 20kg. (3] SPRING BALANCE A PIVOT B 10 20 30 4|0 50 60 70 80 90 100 cm 40 kgf (1) (ii) (iv) Two cones of same height(H), one solid and one hollow are kept side by side on a table. State whose C.G. position will be higher from the table and by how much? [2] Which physical quantities are measured by the following units: [2] (a) Electron volt (eV) (b) Kilo-watt hour (kWh) Thediagram below shows a ski jumper of mass 60kg standing at A, slides to Band takes off for his jump. Then answer the following: (g =10m/s?) [1+2] 3 75 m B (a) Find his change in his gravitational P.E. (b) Calculate the speed with which the the sk er can jump from B,if 25% energy is lost due t friction while sliding. Question 5 Study the given diagram and answer the following: (2+1+1] P2 W Load (ii) (a) State the name given to Pi and P2 (b) How much is V.R. of the given machine? (c) If the Load moves by distance 'x, bywhat distance the effort E will move? From the shown graph for two sound waves (a) and (b), answer the following: Displacemnt- > [2+1] time La (a) time (b) (ii) (a) Compare themn in terms of the subjective properties of sound wave. (b) If wave (a) is superposed on wave (b), state whether anything significant will happen. Asound wave travelling in water with speed of 1400 m/s has wavelength 0.4m. (2+1] (a) Is this wave audible in water? (b) What should be the minimum distance of an obstacle inside water from the source of this wave, to get a distinct echo? Question 6 If the image is Zhe image of an objct fomed by aconvex lens is of same size as the object. now the object is If lens. formedat a distance of 40cm from the lens, then ind the power of the be be formed placedat a distance of 30cm hom the lens, state whether the image size that will [3] biger than smaller than or same size as that of objet. of separation of surface the grazes () Aray of lightwhile coming from within a glass block to air, the glass grazes still glass and air lt now some water is poured on sglass surtface, willthe ray [2] water interface-state with reson [3] shown. as in air ) Ad ver in water looks obliquelv at an object AB Eye of the h e (v) (a) Does the object appes taller, shorter or of same size to the diver? (b) Establish your answer by completing the d agram, with the help of rays AC and AD. [2] Wite tvO points of ditterence detween a real and a virtual image. Question7 the lens L, using The given diagram shows the experimental setup to determine focal length of image() gets its and lens the from f aplane mirror M. If the object O isplaced at a d stance formed on Oitself via lens m rror combination, then answer the following: [1+1+2] M (a) What is the focal length of L? (b)What is the size of the image formed? () State with reasonwhere the image of Onow gets formed if only M is moved away from the lens by distance f. X2 () (i) What problem can occur if copper isused as a fuse w re? Which mater al wire is to be actually [l+1] used as fuse wire? State two elements whose resistance a) increase with r se n temperature b) decrease with r se [2] in temperature. (iv) A cell is marked as 2V. But when it is connected to a c rcuit, during its working, its voltage when measured shows a reading of 1.8V! What is the possible reason for this to happen? [2] Question 8 () [2+2] circuit is to be made as shown. A 12 S2 6V (a) Find the reading of the ammneter(A) and voltmeter(V). (b) If by mistake a student interchanged the position of ammeter and voltmeter in the circuit, thenexplain what ammeter reading the student willget, considering the ammeter to be ideal i.e. having zeroresistance. () () (iv) State the colour of two wires (as per new convention) which are at same potential. Also state the value of that potential. [2] Aperson working in kitchen suddenly receives an electric shock on touching an electrical appliance. State two possible reasons, why the person received the shock. [2] Write two advantages of connecting electrical appliances in parallel in household circuit. [2]

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