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Sample paper- physics (term-II), Class:10+1, , M.M=35 marks, , time: 2hrs, , Note:- Each question carries 1 mark., 1. What is the value of universal gravitational constant?, 2. What is geo-stationary satellite?, 3. Define kepler’s 2nd law., 4. Define elasticity., 5. Define streamline flow., 6. How transfer of heat takes place by conduction method., 7. In winters,metallic handles of a wooden door appear colder.explain why., 8. What do you mean by adiabatic process., 9. State Ist law of thermodynamics., 10. How many degrees of freedom does a diatomic gas have?, 11. Define Boyle’s law., Or, Calculate the kinetic energy of translation of a mole of argon at 127⁰C. Given, kb=1.38x10-23J/K , NA=6.023x1023 mol-1., 12. Define resonance., 13. What are transverse waves., Note:- Each question carries 2 marks., 14. Why steel is more elastic than rubber?, 15. Derive an expression for work done in isothermal process?, 16. State postulates of kinetic theory of gases., 17. What is meant by nodes and antinodes in concept of standing waves., Or, Why are there so many holes in a flute?, Note :- Each question carries 3 marks., 18. How the value of ‘g’ varies with altitude as we move from surface of earth., Or, At what height from the surface of the earth will the value of g be reduced by 36%, from the value at the surface? Radius of earth=6400km, 19. Discuss the principle of refrigerator and calculate its coefficient of performance., Or, Calculate the least amount of work that must be done to freeze one gram of water at, 0⁰C by means of a refrigerator. Temp. of surroundings is 27⁰C. how much heat is, passed on to the surroundings in this process?, 20. Prove that the motion of a loaded spring possess S.H.M?, Or, A particle executes S.H.M given by y = 0.24sin(400t+0.5) in S.I units., Find (i) amplitude (ii) frequency (iii) time period of vibration, Note: Each question carries 5 marks., 21. State and prove bernouille’s theorem., Or, Derive ascent’s formula., Prepared by:- Pooja Garg (Lecturer in Physics), Meritorious School Sangrur

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Solutions:11., we know kinetic energy of a molecule= 3/2 KbT, For 1 mole,kinetic energy= 3/2 NAKbT, =3/2 (6.023x10-23) (1.38x10-23) (127+273), = 4.99x103 J, 18., let h be the height at which the value of g be reduced by 36% i.e. the value of, g at height h is g’=100-36=64% of the earth’s value, Hence g’=64g/100, Now g’= (, Or, , g, , =, , h=, 19., , =, , ), , =, , = 1600 km, , here, W=? ,m = 1 g ,T2 = 0⁰C = 273 K, T1= 27⁰C =300 K,Q1=?,, Q2= mL=1x80=80cals. = 80x4.2 J, Coeff. Of performance =, W=, , 20., , (, , ), , =, , (, , =, ), , = 33.22 joule =, , = 7.91 cal, , Heat passed on to surroundings,, Q1= Q2+W = 80+7.91=87.91 cal., Given y = 0.24sin(400t+0.5), Compare it with standard equation of SHM, Y = a sin(ωt+ ), We have (i) amplitude, a = 0.24 m, (ii) ω = 400 or 2π = 400, Or, , =, , =, , (iii) Time Period T =, , Prepared by:- Pooja Garg (Lecturer in Physics), Meritorious School Sangrur.