MDCAT Physics Work and Energy Online Test

1. Work is defined as the dot product of force and displacement but it is a

2. The field, in which is the work done is independent of the path followed, is called

3. The dimension of power is

4. The Escape velocity of Mars in Kms¯¹

5. The work done by the body is maximum when it has angle

6. The work done in taking a particle from the floor to a table depends on

7. All the food you eat in one day has the energy equivalent to petrol of

8. The escape velocity of moon in Kms¯¹ is

9. Two objects of masses 1 x 10¯³ kg and 4 x 10¯³ kg have equal momentum. What is the ratio of their kinetic energies?

10. An average energy used by the car from petrol in its life time

11. A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

12. Kilowatt-hour commercially used to measure the consumption of

13. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force?

14. Which form of energy does the flowing water possess?

15. The initial velocity with which a body projected upward and never comes back is called

16. A boat moving at constant speed v through still water experiences a total frictional drag F. What is the power developed by the boat?

17. The relation between horse power and watt is

18. The moon produce the tides raise the water in the se roughly

19. Approximate power of flash light in watts (2 cells)

20. The type of energy possessed by a simple pendulum, when it is at the mean position is

21. Geothermal energy with in the earth is generated by

22. Reason of weightlessness in a satellite is

23. A body of mass 2 kg is dropped from a height of 1m. Its kinetic energy as it touches the ground is

24. Power is a measure of the

25. An elevator weighing 3.5 x 10–6 N is raised to a height of 1000 m in the absence of friction, the work done is

26. A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the external force?

27. The average power and instantaneous power become equal if work is done at:

28. A coolie carries a load of 500 N to a distance of 100 m. The work done by him is

29. The original source of geothermal energy is

30. A machine does 2500 J of work in 1 min. What is the power developed by the machine?

31. A body of mass 10 kg is dropped to the ground from a height of 10 meters. The work done by from a height of 10 meters. The done by the gravitational force is (g = 9.8m/s²)

32. For the same velocity, the momentum is maximum for:

33. If it is assumed that a frictional force f is present, during the downward motion of an object of mass, which of the following relation is true.

34. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s²)

35. The value of the escape velocity on the surface of the earth is:

36. The Escape velocity of Earth in Kms¯¹

37. When a force is parallel to the direction of motion of the body. Then work done on the body is

38. Approximate power of colour T.V in watt is

39. The original source of tidal energy is

40. Work done is a gravitational field along a closed loop is

41. A solar cell converts sun’s energy into:

42. If a body a mass of 2 kg is raised vertically through 2m, then the work done will be

43. One Kilowatt hour is equal

44. Which of the following is not a perfectly inelastic collision?

45. A meteor of mass m enters the Earth’s atmosphere at an angle θ to the horizontal with an initial velocity v. Which of the following is true about vertical component of its velocity?

46. The unit of power is

47. If the force applied is F and the velocity gained is v, then the power developed is

48. If a body falls from a height, the relation between its kinetic and potential energies is:

49. The original source of biomass energy is

50. Which of the following is true?

51. If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body ___________.

52. The work done is a gravitational field is independent of:

53. Which of the following is conservative field?

54. A spacecraft moves around Earth in a circular orbit with a constant radius. How much work is done by the gravitational force on the spacecraft during one revolution?

55. The original source of hydroelectric is

56. SI unit of work is

57. The P.E. of a body at a certain height is 200 J. The kinetic energy possessed by it when it just touches the surface of the earth is:

58. The atmosphere is held to the earth by

59. Name the physical quantity which is equal to the product of force and velocity.

60. A 1 kg mass has a kinetic energy of 1 joule when its speed is

61. A man pushes a wall but fails to displace it. He does:

62. The K.E of a light and a heavy object is same. Which object has maximum momentum?

63. The Escape velocity of Saturn in Kms¯¹

64. Approximate power of a car moving at a speed of 90 kmh¯¹ in watts

65. A truck driver is typing to push a loaded truck with an applied force. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?