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Physics Work and Energy Online Mcqs Test

Malik TahirLast Updated: October 13, 2025

Important Work and Energy Question and Answer

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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Physics Work and Energy Practice Test Online With Explanation

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Page 1 of 3

Physics

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

Electrical Energy

Power of petrol engine

Energy produced in nuclear plants

None of these

2. The dimension of power is

[MLT]

[M²LT¯³]

[ML²T¯²]

[ML²T³]

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

2.43

2.59

1.23

2.40

4. Which of the following is true?

Neither momentum nor kinetic energy is conserved in inelastic collisions

Both momentum and kinetic energy are conserved in all collisions

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

Momentum is conserved in all collisions but not kinetic energy

5. 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?

FGd

Zero

-FGd

mgh

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

1100 m sec¯¹

11 m sec¯¹

1100 m sec¯¹

11 x 10⁸ m sec¯¹

7. The original source of geothermal energy is

Moon

Fossil fuels

Biomass

Earth

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

19.6 m

19.6 J

19.6 kg

19.6 N

9. 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?

None

It remains constant throughout the motion.

It decreases throughout the motion.

It increases throughout the motion

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

Kinetic energy

Potential energy

Electrical energy

Gravitational energy

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

The actual path taken

The speed of the particle

The tie taken in this work

The height of the table

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

1.3 x 10⁷

1.2 x 10⁶

1 x 10⁵

1.4 x 10⁸

13. 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?

16:1

4:1

19:1

2:1

14. SI unit of work is

N – ms¯¹

N – m²

N – MS¯²

N – m

15. The original source of biomass energy is

Moon

None of these

Sun

Geothermal

16. 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?

400 J

50 J

-400 J

Zero

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

120

130

100

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

A deuteron

An electron

A proton

An a particle

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

0.45 m/s

4.4 m/s

1.4 m/s

1 m/s

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

No work

Maximum positive work

Negative work

Positive work but

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

1.5

1.56

1.55

1.2 moon m

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

Terminal velocity

Escape velocity

Kinetic energy

None of these

23. Geothermal energy with in the earth is generated by

Residual heat of the earth

Compression of material

Radio active decay

All

24. 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)

- 490 Joules

+ 980 Joules

+ 490 Joules

- 980 Joules

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

Heat energy

Electric energy

Sound

Light

Page 2 of 3

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

Several a day

Once a day

Twice a day

None of these

27. 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

Greater

Less

Equal

Cannot be concluded

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

Constant quantity

Vector quantity

None of these

Scalar quantity

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

Striking of two glass balls

A bullet striking a bag of sand

A man jumping onto a moving cart

An electron captured by a proton

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

¼ liter

1/8 liter

1/5 liter

1/6 liter

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

Its distance

Its mass

Its potential energy

Its path

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

60°

0°

30°

90°

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

Acceleration

Power

Energy

Work

34. Power is a measure of the

Force which produces motion

Rate of change of energy

Change of energy

Rate of change of momentum

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

150 W

21 W

2500 W

42 W

36. The original source of hydroelectric is

Moon

Sun

Wind

Water

37. Reason of weightlessness in a satellite is

Zero gravity

Center of mass

Zero reaction force by satellite surface

None of these

38. 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.

mgh – f = ½ mV²

None of these

mgh – f = ½ mV²

2mg – f = ½ mV²

39. The Escape velocity of Earth in Kms¯¹

15.6

11.2

9.75

12.3

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

Infinity

Maximum

Zero

Minimum

41. 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)

600 J

60 J

50 J

500 J

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

Sound energy

Potential energy + kinetic energy

Potential energy

Kinetic energy

43. The Escape velocity of Saturn in Kms¯¹

35.04

37.0

37.4

30.0

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

Any rate

At variable rate

At high rate

At uniform rate

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

Becomes zero

Decreases

Remains the same

Increases

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

Maximum

Minimum

Zero

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

Data is not sufficient

Both have the same momentum

Heavy object

Light object

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

5 N

1/5 N

50,000 Nm

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

F/v

Fv²

v/F

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

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

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

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

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

Page 3 of 3

51. 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?

F/d

-Fd

Zero

52. Which of the following is conservative field?

All of these

Frictional field

Viscous field

Electrostatic field

53. The relation between horse power and watt is

1 hp = 546 watts

1 hp = 1000 watts

1 hp = 946 watts

1 hp = 746 watts

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

Varying intensity field

Non-conservative field

None of these

Conservative fields

55. The atmosphere is held to the earth by

The rotation of earth

Clouds

Gravity

Winds

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

1 x 10¹¹ J

1 x 10¹² J

1 x 10¹⁰ J

1 x 10⁹ J

57. The unit of power is

Joule per second

Kilojoule

Watt per second

Joule

58. 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:

> P.E.

= P.E.

< P.E.

Cannot be known

59. 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?

400 J

Zero

50 J

-400 J

60. The Escape velocity of Mars in Kms¯¹

5.23

2.89

5.00

3.99

61. One Kilowatt hour is equal

3.5 x 10⁶ J

3.5 x 10⁵ J

306 x 10⁵ J

3.6 x 10⁶ J

62. The original source of tidal energy is

Waves

Sun

Tides

Moon

63. 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

3.5 x 10⁹ J

3.5 x 10⁴ J

3.5 x 10⁶ J

3.5 x 10³ J

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

Fv²

0.5Fv

0.5Fv²

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

392.1 J

3.92 J

39.2 J

38.2 J

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Malik TahirLast Updated: October 13, 2025

4 Comments

Hoorain says:

August 5, 2022 at 12:25 am

Why is it saying that electric force does no work whereas it is actually centripetal force which does no work on the body.

salman says:

August 24, 2021 at 10:49 am

why is it wrong?
magnitude of work =Fdcos tita

Asfand yar says:

June 9, 2017 at 8:32 am

Test =good
Mcqs 11 difficult
Ans with reason please with formula

1. sohali says:
  
  August 12, 2022 at 6:47 pm
  
  the answer of 11 is in Punjab text book

Physics Work and Energy Online Mcqs Test

Important Work and Energy Question and Answer

Physics Work and Energy Practice Test Online With Explanation

Physics

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