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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?

Fv²

0.5Fv²

0.5Fv

2. Which of the following is conservative field?

Electrostatic field

Frictional field

Viscous field

All of these

3. 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

4. The original source of hydroelectric is

Moon

Water

Wind

Sun

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

F/v

v/F

Fv²

6. The atmosphere is held to the earth by

Clouds

The rotation of earth

Winds

Gravity

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

Once a day

Twice a day

Several a day

None of these

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

At uniform rate

Any rate

At variable rate

At high rate

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

Less

Cannot be concluded

Greater

10. 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.

None

It increases throughout the motion

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 kg

19.6 N

19.6 J

19.6 m

12. Reason of weightlessness in a satellite is

None of these

Zero reaction force by satellite surface

Center of mass

Zero gravity

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

1.56

1.5

1.55

1.2 moon m

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

1.23

2.40

2.43

2.59

15. 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 10⁹ J

3.5 x 10⁴ J

3.5 x 10⁶ J

16. The relation between horse power and watt is

1 hp = 746 watts

1 hp = 946 watts

1 hp = 546 watts

1 hp = 1000 watts

17. 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

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

1 x 10⁹ J

1 x 10¹⁰ J

1 x 10¹² J

1 x 10¹¹ J

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

1100 m sec¯¹

11 m sec¯¹

11 x 10⁸ m sec¯¹

1100 m sec¯¹

20. The original source of biomass energy is

Geothermal

Sun

Moon

None of these

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

Kinetic energy

Potential energy + kinetic energy

Potential energy

Sound energy

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

Gravitational energy

Kinetic energy

Electrical energy

Potential energy

23. 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

24. Power is a measure of the

Rate of change of momentum

Change of energy

Force which produces motion

Rate of change of energy

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

Its path

Its mass

Its potential energy

Its distance

Page 2 of 3

26. 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

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

Positive work but

Negative work

Maximum positive work

No work

28. 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.

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

Minimum

Maximum

Zero

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

Becomes zero

Increases

Remains the same

Decreases

31. 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

mgh – f = ½ mV²

32. Geothermal energy with in the earth is generated by

Radio active decay

All

Residual heat of the earth

Compression of material

33. 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?

50 J

400 J

-400 J

Zero

34. 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

Zero

-400 J

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

A bullet striking a bag of sand

A man jumping onto a moving cart

Striking of two glass balls

An electron captured by a proton

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

42 W

21 W

150 W

2500 W

37. The unit of power is

Joule per second

Kilojoule

Watt per second

Joule

38. 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)

60 J

600 J

50 J

500 J

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

Varying intensity field

None of these

Conservative fields

Non-conservative field

40. One Kilowatt hour is equal

3.5 x 10⁵ J

306 x 10⁵ J

3.6 x 10⁶ J

3.5 x 10⁶ J

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

0°

60°

90°

30°

42. 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?

mgh

-FGd

Zero

FGd

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

None of these

Power of petrol engine

Energy produced in nuclear plants

Electrical Energy

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

An electron

An a particle

A proton

A deuteron

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

Acceleration

Work

Energy

Power

46. The original source of tidal energy is

Moon

Tides

Waves

Sun

47. The Escape velocity of Mars in Kms¯¹

2.89

5.00

3.99

5.23

48. The Escape velocity of Saturn in Kms¯¹

30.0

35.04

37.0

37.4

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

Infinity

Maximum

Minimum

Zero

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

Both have the same momentum

Heavy object

Light object

Data is not sufficient

Page 3 of 3

51. The original source of geothermal energy is

Fossil fuels

Earth

Biomass

Moon

52. 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?

19:1

4:1

2:1

16:1

53. The dimension of power is

[ML²T¯²]

[M²LT¯³]

[MLT]

[ML²T³]

54. 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 tie taken in this work

The actual path taken

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

Kinetic energy

None of these

Terminal velocity

Escape velocity

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

1 m/s

0.45 m/s

1.4 m/s

4.4 m/s

57. 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

3.92 J

39.2 J

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

1.2 x 10⁶

1.3 x 10⁷

1.4 x 10⁸

1 x 10⁵

59. SI unit of work is

N – m²

N – MS¯²

N – ms¯¹

N – m

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

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

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

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

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

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

Sound

Electric energy

Light

Heat energy

62. The Escape velocity of Earth in Kms¯¹

11.2

12.3

9.75

15.6

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

1/5 N

50,000 Nm

5 N

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

Constant quantity

None of these

Vector quantity

Scalar quantity

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

100

120

130

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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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