Physics Work and Energy Online Mcqs Test

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Question 1

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

Answer

Loss in P.E = Gain in K.E. – Work done against friction

Answer

Loss in K.E = Gain in P.E. + Work done against friction

Answer

Gain in P.E = Loss in K.E. + Work done against friction

Answer

Gain in K.E = Loss in P.E. – Work done against friction

Question 2

2. 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)

Question 3

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

Question 4

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

Question 5

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

Answer

Positive work but

Answer

Negative work

Answer

Maximum positive work

Question 6

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

Answer

Its potential energy

Answer

Its distance

Question 7

7. 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?

Question 8

8. 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?

Question 9

9. The original source of tidal energy is

Question 10

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

Question 11

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

Answer

Electric energy

Answer

Heat energy

Question 12

12. The atmosphere is held to the earth by

Answer

The rotation of earth

Question 13

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

Answer

Both have the same momentum

Answer

Heavy object

Answer

Light object

Answer

Data is not sufficient

Question 14

14. 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

Answer

Cannot be concluded

Question 15

15. 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:

Answer

Cannot be known

Question 16

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

Question 17

17. The original source of geothermal energy is

Answer

Fossil fuels

Question 18

18. 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

Answer

3.5 x 10³ J

Answer

3.5 x 10⁴ J

Answer

3.5 x 10⁹ J

Answer

3.5 x 10⁶ J

Question 19

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

Answer

An a particle

Answer

An electron

Answer

A deuteron

Question 20

20. One Kilowatt hour is equal

Answer

306 x 10⁵ J

Answer

3.5 x 10⁵ J

Answer

3.6 x 10⁶ J

Answer

3.5 x 10⁶ J

Question 21

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

Question 22

22. 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?

Answer

It increases throughout the motion

Answer

It remains constant throughout the motion.

Answer

It decreases throughout the motion.

Question 23

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

Answer

Escape velocity

Answer

Kinetic energy

Answer

None of these

Answer

Terminal velocity

Question 24

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

Answer

1 x 10⁹ J

Answer

1 x 10¹⁰ J

Answer

1 x 10¹¹ J

Answer

1 x 10¹² J

Question 25

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

Answer

Electrical Energy

Answer

Power of petrol engine

Answer

None of these

Answer

Energy produced in nuclear plants

Question 26

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

Answer

Gravitational energy

Answer

Potential energy

Answer

Electrical energy

Answer

Kinetic energy

Question 27

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

Question 28

28. The dimension of power is

Answer

[M²LT¯³]

Answer

[ML²T¯²]

Question 29

29. The Escape velocity of Earth in Kms¯¹

Question 30

30. The relation between horse power and watt is

Answer

1 hp = 946 watts

Answer

1 hp = 746 watts

Answer

1 hp = 546 watts

Answer

1 hp = 1000 watts

Question 31

31. Which of the following is true?

Answer

Momentum is conserved in all collisions but not kinetic energy

Answer

Momentum is conserved in all collisions but kinetic energy is conserved only in inelastic collisions

Answer

Neither momentum nor kinetic energy is conserved in inelastic collisions

Answer

Both momentum and kinetic energy are conserved in all collisions

Question 32

32. 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?

Question 33

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

Question 34

34. 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.

Answer

mgh – f = ½ mV²

Answer

None of these

Answer

mgh – f = ½ mV²

Answer

2mg – f = ½ mV²

Question 35

35. Which of the following is conservative field?

Answer

Viscous field

Answer

Frictional field

Answer

All of these

Answer

Electrostatic field

Question 36

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

Answer

Potential energy + kinetic energy

Answer

Potential energy

Answer

Sound energy

Answer

Kinetic energy

Question 37

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

Answer

Acceleration

Question 38

38. The Escape velocity of Saturn in Kms¯¹

Question 39

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

Question 40

40. The original source of biomass energy is

Answer

None of these

Answer

Geothermal

Question 41

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

Answer

The tie taken in this work

Answer

The speed of the particle

Answer

The actual path taken

Answer

The height of the table

Question 42

42. The Escape velocity of Mars in Kms¯¹

Question 43

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

Answer

At uniform rate

Answer

At high rate

Answer

At variable rate

Question 44

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

Answer

1.2 x 10⁶

Answer

1.3 x 10⁷

Answer

1.4 x 10⁸

Question 45

45. Geothermal energy with in the earth is generated by

Answer

Radio active decay

Answer

Compression of material

Answer

Residual heat of the earth

Question 46

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

Answer

Striking of two glass balls

Answer

A bullet striking a bag of sand

Answer

An electron captured by a proton

Answer

A man jumping onto a moving cart

Question 47

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

Question 48

48. SI unit of work is

Answer

N – MS¯²

Answer

N – ms¯¹

Question 49

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

Answer

Vector quantity

Answer

None of these

Answer

Scalar quantity

Answer

Constant quantity

Question 50

50. Reason of weightlessness in a satellite is

Answer

Center of mass

Answer

None of these

Answer

Zero gravity

Answer

Zero reaction force by satellite surface

Question 51

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

Answer

Remains the same

Answer

Becomes zero

Question 52

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

Answer

None of these

Answer

Varying intensity field

Answer

Conservative fields

Answer

Non-conservative field

Question 53

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

Answer

Several a day

Answer

None of these

Answer

Once a day

Answer

Twice a day

Question 54

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

Question 55

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

Answer

1.2 moon m

Question 56

56. 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?

Question 57

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

Answer

1100 m sec¯¹

Answer

1100 m sec¯¹

Answer

11 m sec¯¹

Answer

11 x 10⁸ m sec¯¹

Question 58

58. Power is a measure of the

Answer

Force which produces motion

Answer

Change of energy

Answer

Rate of change of momentum

Answer

Rate of change of energy

Question 59

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

Question 60

60. 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?

Question 61

61. The unit of power is

Answer

Joule per second

Answer

Watt per second

Question 62

62. 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)

Answer

+ 490 Joules

Answer

- 490 Joules

Answer

- 980 Joules

Answer

+ 980 Joules

Question 63

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

Question 64

64. The original source of hydroelectric is

Total Questions:	65
Time Allowed:	40 Minutes
Total Marks:	65
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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