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ICSE Board Exam 2005 : Physics

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Physics Question Paper 2005 Question 1 (a) Which physical quantity does the electron volt measure? How is it related to the S.I. unit of this quantity? [2] (b) What should the angle between force and displacement be to get the i. Minimum work ii. Maximum work (c) State Newton's second law of motion. [2] (d) The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one minute.[2] (e) Mention two properties of a wave: one property which varies and the other which remains constant when the wave passes from one medium to another.[2] Question 2 (a) Explain briefly what causes the twinkling of stars at night. [2] (b) State two advantages of an aneroid barometer. [2] (c) Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake. [2] (d) What is meant by the statement, 'the critical angle of diamond is 240 '? How is the critical angle of a material related to its refractive index? [2] (e) A block of wood of volume 25cm3 floats in water with 20cm3 of its volume immersed. Calculate: i. the density and ii. the weight of the block of wood. Question 3 (a) Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each. [2] (b) State two ways by which the frequency of transverse vibrations of a stretched string can be decreased. [2] (c) Why does the temperature of the surroundings start falling when the ice of a frozen lake starts melting? [2] (d) Four resistances of 2.0 each are joined end to end to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent corners. [2] (e) In a three-pin plug, why is the earth pin made longer and thicker than the other two pins? [2] Question 4 (a) State the energy change which takes place when a magnet is moved inside a coil having a galvanometer at its ends. Name this phenomenon. [2] (b) Draw a labelled diagram of an A.C. generator. [2] (c) Calculate the heat energy that will be released when 5.0 kg of steam at l000 C condenses to form water at 1000C. Express your answer in S.I. unit. (Specific latent heat of vaporization of steam is 2268 KJ /Kg.) [2] (d) How many alpha and beta particles are emitted when Uranium nucleus 238 92 U decays to Lead 206 82? Pb[2]

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