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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. 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

0.5Fv²

Fv²

2. The Escape velocity of Saturn in Kms¯¹

37.0

37.4

35.04

30.0

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

Minimum

Maximum

Infinity

Zero

4. The unit of power is

Watt per second

Kilojoule

Joule per second

Joule

5. 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

6. The original source of biomass energy is

Moon

None of these

Sun

Geothermal

7. Which of the following is conservative field?

Viscous field

Frictional field

Electrostatic field

All of these

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

v/F

F/v

Fv²

9. 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

Equal

Greater

Less

Cannot be concluded

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

Maximum positive work

Negative work

Positive work but

No work

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

19.6 J

19.6 kg

19.6 m

19.6 N

12. The atmosphere is held to the earth by

Clouds

Gravity

The rotation of earth

Winds

13. 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 10⁴ J

3.5 x 10³ J

3.5 x 10⁶ J

3.5 x 10⁹ J

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

Power

Energy

Acceleration

Work

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

Kinetic energy

None of these

Terminal velocity

Escape velocity

16. Reason of weightlessness in a satellite is

None of these

Zero reaction force by satellite surface

Center of mass

Zero gravity

17. 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

18. 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 decreases throughout the motion.

It remains constant throughout the motion.

It increases throughout the motion

None

19. One Kilowatt hour is equal

306 x 10⁵ J

3.6 x 10⁶ J

3.5 x 10⁵ J

3.5 x 10⁶ J

20. The Escape velocity of Earth in Kms¯¹

11.2

15.6

9.75

12.3

21. SI unit of work is

N – m²

N – ms¯¹

N – m

N – MS¯²

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

Electrical energy

Kinetic energy

Potential energy

Gravitational energy

23. 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

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

An electron captured by a proton

A bullet striking a bag of sand

A man jumping onto a moving cart

Striking of two glass balls

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

120

130

100

Page 2 of 3

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

Its path

Its distance

Its mass

Its potential energy

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

Potential energy + kinetic energy

Kinetic energy

Potential energy

Sound energy

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

Remains the same

Becomes zero

Decreases

Increases

29. 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

mgh

FGd

-FGd

30. 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

31. Which of the following is true?

Momentum is conserved in all collisions but not kinetic energy

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

Neither momentum nor kinetic energy is conserved in inelastic collisions

Both momentum and kinetic energy are conserved in all collisions

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

A deuteron

A proton

An electron

An a particle

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

Once a day

Several a day

Twice a day

None of these

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

Electric energy

Light

Heat energy

Sound

35. 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

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

1/5 liter

1/8 liter

¼ liter

1/6 liter

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

90°

60°

30°

0°

38. 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?

50 J

400 J

-400 J

Zero

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

1.2 moon m

1.5

1.55

1.56

40. Power is a measure of the

Change of energy

Force which produces motion

Rate of change of energy

Rate of change of momentum

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

Energy produced in nuclear plants

Electrical Energy

None of these

Power of petrol engine

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

21 W

42 W

2500 W

150 W

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

Non-conservative field

None of these

Varying intensity field

Conservative fields

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

The speed of the particle

The height of the table

The actual path taken

The tie taken in this work

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

Both have the same momentum

Data is not sufficient

Heavy object

Light object

46. 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

47. The relation between horse power and watt is

1 hp = 546 watts

1 hp = 1000 watts

1 hp = 946 watts

1 hp = 746 watts

48. 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

400 J

50 J

Zero

49. 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

50. The original source of geothermal energy is

Moon

Biomass

Earth

Fossil fuels

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?

Zero

-Fd

F/d

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

2.40

2.43

1.23

2.59

53. The Escape velocity of Mars in Kms¯¹

5.00

3.99

5.23

2.89

54. 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:

Cannot be known

> P.E.

= P.E.

< P.E.

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

Scalar quantity

Vector quantity

None of these

Constant quantity

56. The original source of hydroelectric is

Moon

Wind

Sun

Water

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

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

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

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

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

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

At variable rate

Any rate

At high rate

At uniform rate

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

Minimum

Zero

Maximum

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

1 x 10⁹ J

1 x 10¹¹ J

1 x 10¹⁰ J

1 x 10¹² J

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

0.45 m/s

1.4 m/s

1 m/s

4.4 m/s

62. The original source of tidal energy is

Moon

Tides

Sun

Waves

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

1.4 x 10⁸

1 x 10⁵

1.2 x 10⁶

1.3 x 10⁷

64. Geothermal energy with in the earth is generated by

Compression of material

Residual heat of the earth

Radio active decay

All

65. The dimension of power is

[ML²T¯²]

[MLT]

[ML²T³]

[M²LT¯³]

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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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