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ICSE class 10th physics

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CSE 2007 question paper physics SECTION I (40 Marks) Attempt all questions from this Section Question 1(a) Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage? [2] (b) Two bodies A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies. [2] (c) What is the S.I. unit of upthrust? Mention one factor on which the upthrust of a liquid depends. [2] (d) Why are infra-red radiations preferred over ordinary visible light for taking photographs in fog? [2] (e) Define Relative density of a substance. [2] Question 2(a) Mention two reasons why water is not suitable barometric liquid. [2] (b) State Snell s Law of Refraction of Light. [2] (c) (i) What will be the color of a blue flower when it is seen in magenta colored light. (ii) Name another secondary color of light in which the flower will show the same color as it shows in the magenta colored light. [2] (d) The upper blood pressure of a patient is 160 cm of mercury whereas the normal blood pressure should be 120 cm of mercury. How much extra pressure is generated by the heart above the normal pressure? (Give your answer in S.I. unit.) (Density of mercury = 13600 kg m-3 ; g = 9.8 ms-2) [2] (e) Draw an approximate graph to show the variation of atmospheric pressure with altitude. [2] Question 3(a) Define the terms:- [2] 1. Amplitude 2. Frequency (as applied to sound waves) (b) An object is placed in front of a converging lens at a distance greater than twice the focal length of the lens. Draw a ray diagram to show the formation of the image. [2] (c) Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. [2] (d) The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:Which of the two, A or B, represents the parallel combination? Give a reason for your answer. [2] (e) Of the three connecting wires in a household circuit:- [2] 1. Which two of the three wires are at the same potential? 2. In which of the three wires should the switch be connected? Question 4(a) What will an alpha particle change into when it absorbs:- [2] 1. One electron; 2. Two electrons? (b) Some hot water was added to three times its mass of cold water at 100C and the resulting temperature was found to be 200C. What was the temperature of the hot water? [2] (c) Calculate the value of the resistance which must be connected to a 15O resistance to provide an effective resistance of 6O. [2] (d) Why are burns caused by steam more severe than those caused by boiling water at the same temperature? [2] (e) Mention two important properties of a metal that make it a good thermionic emitter. [2]

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