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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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Physics

1. 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.

None of these

mgh – f = ½ mV²

2mg – f = ½ mV²

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

Varying intensity field

Conservative fields

None of these

Non-conservative field

3. 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

500 J

50 J

60 J

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

0.5Fv

Fv²

0.5Fv²

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

A bullet striking a bag of sand

An electron captured by a proton

A man jumping onto a moving cart

Striking of two glass balls

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

1 x 10¹⁰ J

1 x 10¹² J

1 x 10¹¹ J

1 x 10⁹ J

7. The relation between horse power and watt is

1 hp = 1000 watts

1 hp = 546 watts

1 hp = 746 watts

1 hp = 946 watts

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?

Zero

FGd

mgh

-FGd

9. Geothermal energy with in the earth is generated by

Residual heat of the earth

All

Compression of material

Radio active decay

10. The original source of geothermal energy is

Biomass

Earth

Fossil fuels

Moon

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

Infinity

Zero

Maximum

Minimum

12. 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?

Zero

50 J

400 J

-400 J

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?

2:1

16:1

4:1

19:1

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

Light object

Data is not sufficient

Both have the same momentum

Heavy object

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

Its distance

Its mass

Its path

Its potential energy

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

50,000 Nm

5 N

1/5 N

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

The actual path taken

The height of the table

The speed of the particle

The tie taken in this work

18. 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?

Zero

-Fd

F/d

19. The Escape velocity of Mars in Kms¯¹

2.89

5.23

3.99

5.00

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

1/5 liter

1/6 liter

1/8 liter

¼ liter

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

Maximum positive work

Negative work

Positive work but

No work

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

Sound energy

Kinetic energy

Potential energy + kinetic energy

Potential energy

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

2.59

2.40

1.23

2.43

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

19.6 kg

19.6 J

19.6 N

19.6 m

25. The unit of power is

Kilojoule

Joule per second

Joule

Watt per second

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

0°

60°

30°

90°

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

100

130

120

28. Reason of weightlessness in a satellite is

None of these

Zero reaction force by satellite surface

Zero gravity

Center of mass

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

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

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

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

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

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

Constant quantity

Vector quantity

Scalar quantity

None of these

31. Which of the following is conservative field?

Frictional field

Viscous field

All of these

Electrostatic field

32. The Escape velocity of Saturn in Kms¯¹

30.0

35.04

37.4

37.0

33. The original source of hydroelectric is

Moon

Sun

Water

Wind

34. 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

Cannot be concluded

Greater

Less

Equal

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

1.3 x 10⁷

1 x 10⁵

1.4 x 10⁸

1.2 x 10⁶

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

1100 m sec¯¹

11 x 10⁸ m sec¯¹

11 m sec¯¹

1100 m sec¯¹

37. One Kilowatt hour is equal

3.5 x 10⁶ J

306 x 10⁵ J

3.6 x 10⁶ J

3.5 x 10⁵ J

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

Once a day

Twice a day

None of these

Several a day

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

1.2 moon m

1.56

1.55

1.5

40. 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)

- 980 Joules

+ 980 Joules

+ 490 Joules

- 490 Joules

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

None of these

Escape velocity

Terminal velocity

Kinetic energy

42. 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

43. 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.

Cannot be known

= P.E.

< P.E.

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

Light

Electric energy

Heat energy

Sound

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

Fv²

v/F

F/v

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

4.4 m/s

0.45 m/s

1 m/s

1.4 m/s

47. Power is a measure of the

Rate of change of momentum

Rate of change of energy

Change of energy

Force which produces motion

48. 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 10³ J

3.5 x 10⁴ J

3.5 x 10⁹ J

3.5 x 10⁶ J

49. The atmosphere is held to the earth by

Gravity

Clouds

The rotation of earth

Winds

50. 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?

It increases throughout the motion

It remains constant throughout the motion.

None

It decreases throughout the motion.

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

Minimum

Zero

Maximum

52. Which of the following is true?

Both momentum and kinetic energy are conserved in all collisions

Neither momentum nor kinetic energy is conserved in inelastic 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

53. SI unit of work is

N – ms¯¹

N – MS¯²

N – m

N – m²

54. The dimension of power is

[ML²T³]

[ML²T¯²]

[M²LT¯³]

[MLT]

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

Increases

Decreases

Becomes zero

Remains the same

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

Electrical Energy

None of these

Energy produced in nuclear plants

Power of petrol engine

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

A deuteron

An a particle

An electron

A proton

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

38.2 J

392.1 J

39.2 J

3.92 J

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

Work

Power

Energy

Acceleration

60. The original source of biomass energy is

Moon

Sun

Geothermal

None of these

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

Gravitational energy

Potential energy

Electrical energy

Kinetic energy

62. 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?

Zero

50 J

-400 J

400 J

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

At high rate

At uniform rate

Any rate

At variable rate

64. The Escape velocity of Earth in Kms¯¹

12.3

11.2

9.75

15.6

65. The original source of tidal energy is

Sun

Waves

Tides

Moon

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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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