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XI Physics Sample paper 3 Pre Board Feb 2022 Time 1.5 hr MM 35, Instructions:, 1. The question paper consists of 21 questions. All questions are compulsory., 2. Question no. 1 to 13 will carry 1 mark each. These questions are very short, answer type. There will be internal choice in question 11., 3. Question no. 14 to 17 will be of two marks each. There will be internal choice in, question 17., 4. Question no. 18 to 20 will be of three marks each. There will be internal choice, in all questions., 5. Question no. 21 will be of five marks. There will be internal choice in it., Section A : 1 Mark questions:, 1. What is the formula for escape velocity in terms of g and R?, 2.Why Newton’s law of gravitation is said to be universal- law?, 3. Does the gravitational force between two particles depends upon the medium between them?, 4. What is the unit of stress in S.I.?, 5. What is meant by the critical velocity of a liquid?, 6. Define specific heat capacity. Write its SI unit and dimensional formula., 7. Write the relation between alpha (α), beta (β) and gamma(ϒ)., 8. Define Quasi-static process., 9. Define Isothermal process., 10. Write two assumptions of kinetic theory of gases., 11. State law of equipartition of energy., OR, What is the value of energy absorbed by each degree of freedom if temperature is 300K?, Given Boltzmann constant (K) = 1.38 × 10-23 J/K, 12. What is second’s pendulum?, 13. Why do we not hear explosions taking place in the cosmos?, Section B : 2 Marks questions:, 14. Why are the bridges declared unsafe after long use?, 15. What are the limitations of the first law of thermodynamics?, 16. What do you mean by degrees of freedom? Write the number of degrees of freedom of mono, di, and linear tri atomic gas molecules., 17. Write at least 4 characteristics of stationary waves., OR, What is Doppler’s effect in sound? Give two examples where apparent frequency heard is more and, less than actual frequency., Section C : 3 Marks questions:, 18. Derive expression for force of attraction between two bodies and then define gravitational, constant., OR, A Saturn year is 29.5 times the Earth year. How far is the Saturn from the Sun if the Earth is 1.50 x, 108 km away from the Sun?, 19. Derive an expression for work done during adiabatic process., OR, An electric heater supplies heat to a system at a rate of 100 W. If system performs work at a rate of, 75 joules per second at what rate is the internal energy increasing?, 20. Find displacement, velocity and acceleration of a body possessing SHM and draw the graph of, y, v &A vs time t., OR

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What are free, forced and resonant oscillations? Give atleast 1 example of each., Section D : 5 Marks questions:, 21. State and prove bernoulli’s theorem ., OR, State stokes law. Derive its expression ., , BY HEAD OFFICE, PPPP SCIENCE SEN SEC STATE TEAM