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.
Test Helpful For:	Physics Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Physics Interview Question Answer

Physics Work and Energy Practice Test Online With Explanation

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Page 1 of 3

Physics

1. 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

2. Which of the following is conservative field?

Viscous field

Electrostatic field

All of these

Frictional field

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

38.2 J

39.2 J

3.92 J

392.1 J

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

Light

Electric energy

Sound

Heat energy

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

Minimum

Zero

Maximum

6. Which of the following is true?

Neither momentum nor kinetic energy is conserved in inelastic collisions

Momentum is conserved in all collisions but not kinetic energy

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

7. The relation between horse power and watt is

1 hp = 546 watts

1 hp = 746 watts

1 hp = 1000 watts

1 hp = 946 watts

8. Reason of weightlessness in a satellite is

Zero gravity

Center of mass

None of these

Zero reaction force by satellite surface

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

1.56

1.5

1.55

1.2 moon m

10. The unit of power is

Joule per second

Watt per second

Joule

Kilojoule

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

Potential energy + kinetic energy

Potential energy

Sound energy

Kinetic energy

12. The atmosphere is held to the earth by

Clouds

The rotation of earth

Winds

Gravity

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

19:1

4:1

14. Geothermal energy with in the earth is generated by

Residual heat of the earth

Radio active decay

All

Compression of material

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

At variable rate

At uniform rate

Any rate

At high rate

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

The speed of the particle

The actual path taken

The tie taken in this work

The height of the table

17. 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

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

1/8 liter

¼ liter

1/6 liter

1/5 liter

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

None of these

Kinetic energy

Terminal velocity

Escape velocity

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

A proton

An electron

An a particle

A deuteron

21. SI unit of work is

N – MS¯²

N – ms¯¹

N – m

N – m²

22. The Escape velocity of Saturn in Kms¯¹

37.0

30.0

37.4

35.04

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

None of these

Electrical Energy

Energy produced in nuclear plants

Power of petrol engine

24. 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)

500 J

50 J

600 J

60 J

25. 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.

2mg – f = ½ mV²

None of these

mgh – f = ½ mV²

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26. 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 10⁶ J

3.5 x 10³ J

3.5 x 10⁴ J

3.5 x 10⁹ J

27. 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

28. 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

29. The Escape velocity of Mars in Kms¯¹

5.23

2.89

3.99

5.00

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

Conservative fields

Non-conservative field

Varying intensity field

None of these

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

42 W

2500 W

21 W

150 W

32. The original source of geothermal energy is

Earth

Fossil fuels

Biomass

Moon

33. 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

34. 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

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

0.5Fv²

0.5Fv

Fv²

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

1 x 10⁹ J

1 x 10¹² J

1 x 10¹¹ J

1 x 10¹⁰ J

37. The original source of biomass energy is

Moon

None of these

Sun

Geothermal

38. 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.

It decreases throughout the motion.

None

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

Scalar quantity

Constant quantity

None of these

Vector quantity

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)

+ 490 Joules

- 980 Joules

- 490 Joules

+ 980 Joules

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

1.4 x 10⁸

1 x 10⁵

1.3 x 10⁷

1.2 x 10⁶

42. One Kilowatt hour is equal

3.5 x 10⁵ J

3.6 x 10⁶ J

3.5 x 10⁶ J

306 x 10⁵ J

43. The dimension of power is

[M²LT¯³]

[MLT]

[ML²T¯²]

[ML²T³]

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

Its mass

Its distance

Its potential energy

Its path

45. 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

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

2.43

1.23

2.59

2.40

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

Energy

Power

Acceleration

Work

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

120

130

100

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

30°

0°

60°

90°

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

Heavy object

Data is not sufficient

Light object

Both have the same momentum

Page 3 of 3

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

Gravitational energy

Potential energy

Electrical energy

Kinetic energy

52. The Escape velocity of Earth in Kms¯¹

15.6

12.3

11.2

9.75

53. Power is a measure of the

Change of energy

Rate of change of energy

Rate of change of momentum

Force which produces motion

54. 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

55. 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

Zero

-Fd

56. The original source of tidal energy is

Waves

Sun

Tides

Moon

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

v/F

F/v

Fv²

58. 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

-FGd

mgh

Zero

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

50,000 Nm

1/5 N

5 N

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

Positive work but

Negative work

No work

Maximum positive work

61. 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 m

19.6 J

19.6 N

62. The original source of hydroelectric is

Wind

Sun

Moon

Water

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

Zero

Minimum

Infinity

Maximum

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

Several a day

Once a day

None of these

Twice a day

65. 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

Loss in P.E = Gain in K.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

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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

Important Work and Energy Question and Answer

Physics Work and Energy Practice Test Online With Explanation

Physics

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Malik Tahir

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