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St. Francis Xavier School Rehearsal Examination (2017 18) Subject Physics Class X Time 2 hrs F.M. 80 Answer 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 in reading the question paper. The time given at the head of this Paper is the time allowed for writing the answer. Section I is compulsory. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [] Section I (40 MARKS) (Attempt All Questions) Question 1: [2X5 = 10] a) A force is applied on (i) a non-rigid body and (ii) a rigid body. How does the effect of the force differ in the above two cases? b) A metallic ball is hanging by a string from a rigid support. Draw a neat labelled diagram showing the forces acting on the ball and the string. c) (i) What is the weight of a body placed at the centre of the earth? (ii) What is the principle of an ideal machine? d) Is it possible to have an accelerated motion with a constant speed? Explain. e) (i) When does a force do work? (ii) What is the work done by the moon when it revolves around the earth? Question 2: [2X5 = 10] a) Calculate the change in the kinetic energy of a moving body if its velocity is reduced to 1/3 rd of the initial velocity. b) State the energy changes in the following devices while in use : (i) A loud speaker, (ii) A glowing electric bulb. 1 This question paper consists of 5 pages
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