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GOLDCREST HIGH, LATUR On the Wings Of Excellence PRACTICE PAPER FOR THE ICSE (2018-19) PHYSICS (Two hours) 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 answers. Attempt all the questions from Section I and any four questions from Section II. The intended marks for the questions or parts of the questions are given in brackets []. Section-I (Attempt ALL questions) Question. 1 a. What is the weight of the body placed at the centre of the Earth? b. Name the factors affecting turning effect of a body. c. Define energy and state its SI units. d. What should be the angle between the force and the displacement to get the: (i) Minimum work? (ii) Maximum work? e. State the energy changes in the following while in use: (i) Burning of a candle. (ii) A steam engine. f. What is the SI unit of moment of force? [1] [2] [2] [2] [2] [1] Question. 2 a. A uniform meter rule balances horizontally on a knife edge at 29 cm mark when a weight of 20 gf is suspended from one end. (i) Draw a diagram of the arrangement. (ii) What is the weight of the meter rule? [2] b. State the class of levers and the relative positions of the load (L), fulcrum (F) and effort (E) in each of the following cases: (i) A bottle opener. (ii) Sugar tongs. [2] c. State the dependence of angle of deviation of light while passing through the prism: (i) On the refractive index of the material of the prism. (ii) On the wavelength of the light. [2] d. A postage stamp kept below a rectangular glass slab of refractive index 1.5 when viewed from vertically above it, appears to be raised by 7.0 mm. Calculate the thickness of the glass slab. [2] e. We can burn a piece of paper by focusing the sun rays by using a particular type of lens. (i) Name the type of the lens used for the above purpose. (ii) Draw a ray diagram to support your answer. [2] Page 1 of 5
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