1. State the principle of conservation of angular momentum and explain its applications.

2. Define radius of gyration

3. Establish equation of continuity of an ideal liquid flow

4. Explain the variation of acceleration due to gravity with (a) altitude (b) depth

5. State Kepler’s laws of planetary motion

6. Define escape velocity and derive an expression for the escape velocity of a body on the surface of earth.

7. State theorem of perpendicular axis and the theorem of parallel axes.

8. Show that the oscillations of a simple pendulum are simple harmonic.

9. What are beats? How are they produced?

10. What is Doppler Effect?

11. State Carnot’s theorem.

12. Describe Carnot’s cycle. (Draw graph)

13. State the three laws of thermo dynamics (Zeroth law, first law and second law)

14. Apply I law of thermodynamics to (a) isothermal process (b) adiabatic process

15. Derive an expression for the work done in an isothermal process

16. Find the angle of projection for a projectile motion whose range R is 4 times the maximum height H.

17. The airplane shown is in level flight at an altitude of 1 km and a speed of 200 km/h. At what distance ‘S’ should it release a heavy bomb to hit the target X? Take g = 10 m/s2.

18. At what temperature is the Fahrenheit scale reading equal to half that of the Celsius scale?

19. What is a simple harmonic motion? State its characteristics.

20. What is capillarity? Derive an expression for capillary ascent.

21. Define surface tension.

22. Derive an expression for velocities after collision when two bodies undergo perfectly elastic collision in one dimension.

23. State triangle law of vector addition. Find out the angle between the resultant vector and the vector A when two vectors A =3m is acting towards east and vector B=4m is acting towards the north east.

24. Prove work-energy theorem for a variable force.

25. The moments of inertia of two rotating bodies A and B are IA and IB (IA > IB) and their angular momenta are equal. Which one has greater kinetic energy?

26. Derive an equation for the work done in an isothermal process and draw the P-V indicator diagram.

27. Deduce an expression for the total energy of a system executing S.H.M. Draw the energy curve.’

28. What do you mean by standing wave? Deduce an expression for the nodes and antinodes of a standing wave. Write down the positions of nodes and antinodes.

29. Friction is a necessary evil, comment. Mention some methods of reducing friction.

30. State Bernoulli’s principle. Deduce an expression for the volume of the liquid flowing per second through the wider tube of a venturi meter.

31. What do mean by damped oscillation?

32. What is resonance in oscillations?

33. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer?

34. A light body and a heavy body have the same momentum which of the two bodies will have greater kinetic energy?

35. When is work done by the force is negative? Give condition for work to be positive?

36. Define one newton.

37. Distinguish between free, forced, and resonant oscillation with illustration.

38. Explain displacement, velocity, acceleration, and time period of a simple harmonic motion. Find relation between them.

39. State and explain superposition of waves.

40. Discuss the characteristics of stationary waves.

41. Explain the need of banking of tracks.

42. Explain why a gas has two specific heats?

43. The momentum of a body increases by 20%. What is the percentage increase in kinetic energy?

44. Calculate the energy spent in spraying a drop of mercury of 1cm radius into 106 droplets, all of same size. Surface tension of mercury is 55´10-2 Nm-1.

45. From kinetic theory of gas, find an expression for pressure exerted by gas on the walls of container.

46. Define orbital velocity of a satellite and derive an expression for orbital velocity.

47. Derive Stoke’s law by the method of dimensions.

48. Why does a freely falling body experience weightlessness?

49. Derive an expression for the apparent weight of a person in a lift when (a) the lift is moving up with acceleration (b) moving down with acceleration (c) moving up with acceleration (d) moving down with deceleration (e) moving up or down with constant velocity.

50. State Hooke’s law of elasticity. Draw stress vs strain for a wire subjected to gradually increasing tension and explain the various points of the curve. (Elastic region, proportional limit, elastic limit, plastic region, yield point and breaking point)

51. State Torricelli’s theorem and prove it. (Derive an expression for velocity of efflux)

52. Define thermal conductivity.

53. Explain the principle and working of carnot refrigerator.

54. Show that Cp is greater than Cv

55. Distinguish centre of mass and centre of gravity.

56. What are geostationary satellites?

57. Define Young’s modulus, bulk modulus and rigidity modulus.

58. State Pascal’s law and explain any one application. (Hydraulic brakes, hydraulic lift, hydraulic press)

59. Derive the relation L=I for a rigid body

60. Show that it is easier to pull a lawn roller than to push it.

Apr 19

# CBSE Class XI : Selected Questions for practice and quick revision

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nice but i need he answers for all these questions