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. The relation between horse power and watt is

1 hp = 746 watts

1 hp = 546 watts

1 hp = 946 watts

1 hp = 1000 watts

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

60°

0°

90°

30°

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

None of these

Scalar quantity

Constant quantity

Vector quantity

4. The original source of biomass energy is

Geothermal

Sun

None of these

Moon

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. 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 10³ J

3.5 x 10⁶ J

7. 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

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

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

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

8. 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

Less

Greater

Cannot be concluded

Equal

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

Potential energy + kinetic energy

Sound energy

Potential energy

Kinetic energy

10. The original source of hydroelectric is

Moon

Wind

Water

Sun

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

Power of petrol engine

Electrical Energy

Energy produced in nuclear plants

None of these

12. 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

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

2500 W

42 W

21 W

150 W

14. 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

15. 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

16. The Escape velocity of Mars in Kms¯¹

3.99

5.23

2.89

5.00

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

1 m/s

1.4 m/s

0.45 m/s

4.4 m/s

18. The atmosphere is held to the earth by

Gravity

Winds

Clouds

The rotation of earth

19. Reason of weightlessness in a satellite is

Center of mass

None of these

Zero gravity

Zero reaction force by satellite surface

20. 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

50 J

400 J

Zero

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

Fv²

v/F

F/v

22. 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

23. 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

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

1 x 10¹¹ J

1 x 10¹² J

1 x 10⁹ J

1 x 10¹⁰ J

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

Kinetic energy

Escape velocity

Terminal velocity

None of these

Page 2 of 3

26. Power is a measure of the

Change of energy

Rate of change of momentum

Force which produces motion

Rate of change of energy

27. 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

28. The dimension of power is

[ML²T¯²]

[M²LT¯³]

[MLT]

[ML²T³]

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

2.59

2.40

1.23

2.43

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

At variable rate

Any rate

At uniform rate

At high rate

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

A deuteron

A proton

An a particle

An electron

32. 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

Zero

400 J

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

No work

Positive work but

Maximum positive work

Negative work

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

3.92 J

38.2 J

392.1 J

39.2 J

35. 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

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

Non-conservative field

Varying intensity field

Conservative fields

None of these

37. 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

2:1

19:1

38. The original source of geothermal energy is

Fossil fuels

Earth

Moon

Biomass

39. The original source of tidal energy is

Sun

Waves

Tides

Moon

40. The Escape velocity of Saturn in Kms¯¹

37.4

37.0

30.0

35.04

41. Which of the following is conservative field?

Viscous field

Frictional field

All of these

Electrostatic field

42. SI unit of work is

N – m²

N – ms¯¹

N – MS¯²

N – m

43. 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

44. 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

Light object

Heavy object

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

130

100

120

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

Several a day

Twice a day

Once a day

None of these

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

1/6 liter

1/8 liter

¼ liter

1/5 liter

48. One Kilowatt hour is equal

306 x 10⁵ J

3.5 x 10⁶ J

3.6 x 10⁶ J

3.5 x 10⁵ J

49. 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

50. 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

Page 3 of 3

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

Electrical energy

Kinetic energy

Potential energy

Gravitational energy

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

Its potential energy

Its mass

Its path

Its distance

53. 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 m

19.6 N

54. 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

600 J

60 J

50 J

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

Heat energy

Light

Electric energy

Sound

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

Work

Acceleration

Energy

Power

57. Geothermal energy with in the earth is generated by

All

Residual heat of the earth

Compression of material

Radio active decay

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

Minimum

Zero

Maximum

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

1.55

1.5

1.2 moon m

1.56

60. The Escape velocity of Earth in Kms¯¹

15.6

9.75

11.2

12.3

61. The unit of power is

Kilojoule

Watt per second

Joule

Joule per second

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

Decreases

Increases

Becomes zero

Remains the same

63. 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

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

Maximum

Infinity

Zero

Minimum

65. 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.

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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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