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CLASS-11TH (SCIENCE), Sample Paper, SUBJECT-PHYSICS, TIME ALLOWED-2 HOURS, , M.M.-35, , INSTRUCTIONS1.The question paper consists of 21 questions. All questions are compulsory., 2.Question no. 1 to 13 will carry one mark each., 3.Question no. 14 to 17 will of 2 marks each. There will be internal choice in one question., 4. Question no. 18 to 20 will of 3 marks each. There will be internal choice in all question., 5.Question no. 21 will be of 5 marks. There will be internal choice in it., , Section-A, 1.Why falling water drops are spherical in shape?, 2.What is zeroth law of thermodynamics?, 3.Give SI unit of stress., 4.Value of acceleration due to gravity at the Centre of earth………………, 5.Average kinetic energy of a gas molecule is ……………. of the nature of gas., 6.Time period of geostationary satellite is…………………, 7.Person sitting in artificial satellite of the earth have ………………….. weight., 8.Can specific heat of gas be negative?, 9………………….. method of heat transfer does not require any medium., 10.What is the nature of electromagnetic waves?, 11.Write perfect gas equation., 12.What is the relation between time period and frequency?, 13.Internal energy of an ideal gas depends upon……………….

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Section-B, 14.Define Young’s modulus. Also give its units., 15.What is first law of thermodynamic?, 16.Write postulates of kinetic theory of gases., 17.Why are stationary waves so called?, OR, Define wave and wave motion., , Section-C, 18.State and explain Kepler’s law of planetary motion., OR, How far away from the surface of earth does acceleration due to gravity, becomes 4% of its value on the surface of earth. Radius of earth=6400km, 19.What is simple pendulum? Derive an expression for its time period., OR, Discuss free, forced and resonant vibrations. Give example of each., 20.Define Isothermal Process. Derive an expression for work done during an, isothermal process., OR, One of the most efficient engines ever developed operated between 2100 K, and 700 K. Its actual efficiency is 40%. What percentage of its maximum, possible efficiency is this?, , Section-D, 21.State and prove Bernoulli’s theorem., OR, Derive Ascent formula for rise of liquid in a capillary tube.