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Physics preboard examination(2020-21) Class 10 ICSE 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 in reading the Question Paper. The time given at the head of this paper is the time allowed for writing the an Section I is compulsory. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in bracke SECTION I (40 marks) Attempt all questions from this Section. Question 1 (a) State the energy changes in the following cases while in use: [2] (i) a photovoltaic cell (ii) A ceiling fan [2] (b) Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity? (c) Can the centre of the gravity of a body be outside it? Justify [2] your answer giving an example (d) State the dependence of angle of deviation: [2] (i) On the refractive index of the material of the prism. (ii) On the wavelength of light. (e) Define the term velocity ratio. State its SI unit [2] Question 2 (a)Calculate the heat gained by 400g water when it is heated [ 2] from 10 C to 50 C. (Specific heat capacity of water = 4200 J / kg 0C) (b) Which physical quantity does the electron volt measure? How [2] is it related to the SI unit of this quantity? 1
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