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ICSE Class X Mid-term 2023 : Physics : Second Formative Assessment

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N. L. Dalmia High School (4Sehool of Bxeclone of V L. Dalmia Edueatiel Soeiety) 1CSE -ISC ISO 9O01:2015 SECOND FORMATIVE ASSESSMENT PHYSICs Class: X SESSIONII Date: 18.07.2022 Marks:40 / Pgs 2 Time: 1 hr Answer to this paper must be written on the paper provided separately. You will not be allowed to write in the first 1Ominutes. This time is tobe spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers The intended marks for questions or for parts of questions are given in brackets [) SECTION A (Attempt all questions) Question 1 Two bodies,Aand Bof equal mass are kept at heights 20 mand 30 mrespectively. (21 Calculate the ratio of their potential energies 2. When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where [21 [21 does it get its kinetic energy? 3. Abody falls freely under gravity from rest. Name the kind of energy it willpossess a) At the point from where it falls b) While falling 4. Where does the position of centre of gravity lie for a) a circular lamina 5. [21 (b) a triangular lamina Aman can open a nut by applying a force of 150 N by using a handle of length 0.4 m. What should be the length of the handle if he is able to open it by applying a force of 60N? [21 Question 2 1. Abody of mass 5kg is moving with a velocity of 10 ms, What will be the ratio of its initial kineticenergy and final kinetic energy, if the mass of the body is doubled and its [21 velocity is halved? 2. Abody is acted upon bya force. State two conditions under which the work done could be zero. [21 3. (a) Define one Joule. (b) Write the relation between S.l. unit and C.G.S. unit of Work. 4. (a) What is meant by the term 'moment of force'? [21 (b) If the moment of force is assigned a negative sign then wil the turning tendency of the force be clockwise or anticlockwise? [21 Contd.. Pg 2 -2 X Phy. 5. A ball is placed on a compressed spring. When the spring is released, the ball is observed to fly away. [21 Compressed Spring (a)What form of energy does the compressed spring possess? (b) Why does the ball fly away? SECTION B (Attempt all questions) Question 3 1. Drawa diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation. 2. (a) Name the physical quantity measured in terms of horse power. [31 [31 (b) Anut is opened by a wrench of length 20cm. If the least force required is 2N, find the moment of force needed to loosen the nut. (c) Explain, Why the work done by a fielder when he takes a catch in a cr cket match is negative. 3. A uniform metre scale can be balanced at the 70.0 cm mark when a mass of 0.05 kg is hung from the 94.0cm mark. (a) Drawa diagram of the arrangement. [41 (b) Find the mass of the metre scale. Question 4 1. A uniform half metre rule balances horizontally on a knife edge at 29 cm mark when a [3]1 weightof 20 gf is suspended from one end. (a) Drawa diagram of the arrangement (b) What is the weight of the half metre rule? 2. (a) Define Principle of conservation of energy. (b) An object of mass m falls from height h under the influence of gravity. Answer the following questions. i) The speed of object at a point just above the surface of earth. [31 i) The total energy at a point somewhere in between. 3. (a) A movingbody weighing 400 Npossesses 500 J of kinetic energy. Calculate the (21 velocity with which the body is moving. (g = 10 ms?) (b) Aboy of mass 30 kg is sitting at a distance of 2m from the middle of a see-saw. Where should a boy of mass 40 kg sit so as to balance the see-saw? (21

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