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XI Physics Sample Paper 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., 3. Question no. 14 to 17 will be of two marks each. There will be internal choice in one question., 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. Write the dimensions of gravitational constant (G)., (1), 2. State Kepler third law of planetary motion., (1), 3. What do you mean by escape speed at a place?, (1), 4. Define elastic fatigue of a material., (1), 5. Define angle of contact of a liquid with a solid surface., (1), 6. What do you mean by latent heat of a substance? What are its units?, (½+ ½), 7. Give the statement of Newton’s law of cooling., (1), 8. State first law of thermodynamics., (1), 9. Write Clausius statement of second law of thermodynamics., (1), 10. What do you mean by degrees of freedom of a system?, (1), 11. Give the statement of law of equipartition of energy., OR, (1), 11. Find average kinetic energy per molecule of hydrogen gas at a temperature of 6000K., Given Boltzmann constant, K = 1.38 × 10-23 J/K, (1), 12. What is the effect on time period of oscillations of a body attached to a spring if the spring is cut to half of its length? (1), 13. What is the effect on the phase of a wave when it gets reflected by (i) solid boundary (ii) open boundary (½+ ½), Section B : 2 Marks questions:, 14. Make a well labeled stress versus strain curve for a steel wire., (2), 15. What do you mean by cyclic and non cyclic processes? Give at least one example of each., (½×4), 16. Find the values of CV, CP and γ for CO2 gas using law of equipartition of energy. Given CV = dU/dT, where U is the, energy of 1 mole of the gas., (1+½+ ½), 17. The speed of longitudinal waves in a body may depend on (i) Bulk modulus (B) of its material (ii) density of material (ρ)., Find the speed of longitudinal waves in the body using dimensional analysis., (2), OR, 17. What are beats? Write at least 2 necessary conditions for the formation of beats., (1+½+½), Section C : 3 Marks questions:, 18. Find the effect of depth on acceleration due to gravity and hence find the %age decrease in the value of g with depth, (d)., OR, (2+1), 18. Find the value of acceleration due to gravity at a depth equal to half the radius of earth from the surface of earth if the, same value on earth surface is 9.8m/s2., (3), 𝛾, 19. The adiabatic equation is given by 𝑃𝑉 = constant. Derive this relation in terms of (i) T and V (ii) P and T (1½ +1½), OR, 19. In a certain process 200 cal of heat is drawn out from a system and at the same time 200 J of mechanical work was, done by the system. Find in calorie the change in its internal energy., (3), 20. Find displacement, velocity and acceleration of a body possessing SHM and draw the graph of y, v &A vs time t., OR, (½×6), 20. What are undamped and damped oscillations? Give at least 1 example of each. Draw the graphs of displacement (y), versus time (t) in these two types of oscillations., (½×6), Section D : 5 Marks questions:, 21. State and derive equation of continuity. Explain on the basis of continuity equation why (i) deep water runs slow (ii) The, stream of water becomes narrow as it comes down., (3+2), OR, 21. Give reason why in a capillary tube, the liquid rises or dips. Making diagram, derive the rise of liquid in a capillary tube, (Ascent Formula)., (1+1+3), BY HEAD OFFICE, PPPP SCIENCE SEN SEC STATE TEAM
