Physics Work and Energy MCQs Chapter 4 Class 11

Physics Work and Energy for First Year Entry Tests and FSC Board Exams

Work and Energy is an important chapter in First Year Physics that explains how forces produce motion and how energy is transferred and transformed. Therefore, this topic is crucial for students preparing for MDCAT, NUMS, AKU, NUST, UET ECAT, and FSC First Year board exams. Key concepts include work, kinetic energy, potential energy, power, conservation of energy, and work-energy theorem, which are frequently tested in MCQs and numerical problems.

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Created on February 07, 2022 By Ali Durrani

Physics Ch 4 Class 11 Work, Power and Energy

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1 / 70

The food we eat in one day has about the same energy as:

NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:

A) 0.33 litre of petrol

B) 1 litre of petrol

C) 0.5 litre of petrol

D) 2 litre of petrol

2 / 70

If the mass and radius of Earth arc reduced to one fourth, the escape velocity will.

Reduce to one fourth

Reduce to one half

Remain the same

Increase to two times

3 / 70

When the output power equals to one-half of the input power, efficiency of the transformer becomes:

NUMS 2015
Physics
Work, Power and Energy
Elimination Tool:

A) 0%

B) 100%

C) 50%

D) 200%

4 / 70

Coal and petrol are stores of chemical energy when are burnt, chemical energy is converted into heat energy i.e chemical energy = heat energy + ______.

NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) Electrical energy

B) losses

C) gains

D) wind energy

5 / 70

A/An _____ is that in which the momentum of the system as well as the kinetic energy of the system before and after the collision is conserved i.e. remains the same.

NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) Elastic collision

B) In-elastic collision

C) Conserved collision

D) Direct collision

6 / 70

A particle having mass m and momentum p, the kinetic energy of the particle is given by:

PMC Sample 3
Physics
Work, Power and Energy
Elimination Tool:

A) p^2/m

B) p/m

C) p^2/(2m)

D) m^2/p

7 / 70

Which is the unit of energy

PMC Sample 3
Physics
Work, Power and Energy
Elimination Tool:

A) joule

B) erg

C) kWh

D) all of these

8 / 70

Work done by retarding force is:

Positive

negative

Zero

None of these

9 / 70

What is the unit of Power

Watt

Ampere

Newton

Joules

10 / 70

An object whose mass is 100 g starts from rest and moves with constant acceleration of 20 cm/s2. At the end of 8s its momentum in g cm / s is:

NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) 500

B) 8000

C) 16, 000

D) 33, 000

11 / 70

A body of mass m moving with velocity v has a kinetic energy. If its velocity is increased 25%. what will be the new K.E?

25/16 K

23/34 K

12/45 K

34/58 K

12 / 70

Mechanical energy of an object is the sum of its Potential Energy and ?

Electrical Energy

Thermal Energy

Kinetic Energy

All of these

13 / 70

If the speed of an object is doubled, its Kinetic Energy will

Increase by 4 times

Decrease by 4 times

First increase then decrease

Remain the same

14 / 70

Which of the following statement shows that no work is done?

UHS 2019
Physics
Work, Power and Energy
Elimination Tool:

A) Pushing a car to start it moving

C) The moon Orbiting the earth.

B) Lifting the weights.

D) Writing an essay on a page.

15 / 70

The escape velocity of a body from the earth is Ve If the radius of the earth contracts to 1/4th its value, keeping the mass of the earth constant, the escape velocity will be

Double

Half

Same

Triple

16 / 70

If a force of 1 N acts on a body through a distance of 1 m in the direction of force, how much
work is done?

1 J

– 1 J

0 J

Either a or b

17 / 70

When a 7000 N elevator moves from street level to the top of a building 300 m above the street level, what is the change in gravitational potential energy?

NTS 2016 DUHS & JSMU
Physics
Work, Power and Energy
Elimination Tool:

A) 1.1 x 106J

B) 2.1 x 106J

C) 3.1 x 106J

D) 4.1 x 106J

18 / 70

Two identical bodies have a velocity ratio 2 : 3. What is the ratio of kinetic energies?

NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:

A) 9:4

B) 3:2

C) 4:9

D) 2:3

19 / 70

A mass of 20 kg is lifted from the floor to a height of 2m in 4.9 sec. Calculate the power in Watts.

NUMS 2019 Reconduct
Physics
Work, Power and Energy
Elimination Tool:

A) 60 W

B) 80 W

C) 100 W

D) 120 W

20 / 70

A 60 kg boy runs up a hill through a height of 6 m in 3 seconds. How much work does he do against gravitational force?

NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) 3000 J

B) 2528 J

C) 3500 J

D) 3528 J

21 / 70

Work will be maximum when the angle between force and displacement is:

180

22 / 70

A gas is enclosed in a container fitted with a piston of cross-sectional area of 0.10 m2. The pressure of the gas is maintained at 8000 N/m2. When heat is slowly transferred, the piston is pushed up through a distance of 4.0 cm. If 42 J heat is transferred to the system during the expansion, what is the change in the internal energy of the system?

NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:

A) 5 J

B) 10 J

C) 20 J

D) 30 J

23 / 70

Work done by friction force is always:

PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:

A) Negative

B) Positive

C) Zero

D) Maybe positive, maybe negative, or maybe zero

24 / 70

What is the speed of 2.0 kg metallic bob at the mean position of a simple pendulum, when released from its extreme position 0.5m high? (g = 10 ms-2)

PMC 2020
Physics
Work, Power and Energy
Elimination Tool:

A) 3.16 ms-1

B) 10 ms-1

C) 100 ms-1

D) 50 ms -1

25 / 70

The force constant k1 and k2 of two springs are in a ratio of 5 : 4. They are stretched by the same length, if the potential energy stored in one spring is 25 J then the potential energy stored in the second spring is:

PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:

A) 25 J

B) 16 J

C) 100 J

D) 20 J

26 / 70

ML^2T^-3 is the dimension of:

Power

Work

Momentum

Force

27 / 70

A 1.75 m tall weight-lifter raises a weight of mass 50 kg to a height of 0.5 m above its head. How much work is being done by it? (g = 10 ms-2)

PMC 2020
Physics
Work, Power and Energy
Elimination Tool:

A) 2125 J

B) 2500 J

C) 50 J

D) 1125 J

28 / 70

Escape velocity of Neptune is:

2.4

10.4

25.4

37.0

29 / 70

An object of mass 2kg has a velocity of 6m/s. After 8 seconds, its velocity increases to 10 m/s.
Calculate the power of the object

10 Watt

5 Watt

8 Watt

9 Watt

30 / 70

Which of the following is a conservative field?

Electrical

Resistance

Friction

Magnetic

31 / 70

An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If the force is doubled with the velocity remaining constant what happens to its total power?

UHS 2019
Physics
Work, Power and Energy
Elimination Tool:

A) It is squared

B) It is halved

C) It is doubled

D) It does not change

32 / 70

One kilowatt – hour is equivalent to a factor ____ in Joules.

NTS 2016 DUHS & JSMU
Physics
Work, Power and Energy
Elimination Tool:

A) 1.2 x 10^5

B) 1.2 x 10^6

C) 3.6 x 10^5

D) 3.6 x 10^6

33 / 70

From the given options, which one lists the amount of work done from smallest to Largest displacement is In forward direction?

34 / 70

When the speed of your car is halved, by what factor does its kinetic energy decreases?

PMC 2020
Physics
Work, Power and Energy
Elimination Tool:

A) ½

B) ¼

C) ⅛

D) ⅙

35 / 70

When an object is thrown upward, it rises to height h. How high is the object in terms of h, when it has lost ⅓ of its original kinetic energy?:

NTS 2019
Physics
Work, Power and Energy
Elimination Tool:

A) H/2

B) H/3

C) H/4

D) H/6

36 / 70

Which one of them is not conservative force?

Gravitational force

Tension in string

Elastic spring force

Electric force

37 / 70

The basic source of geothermal energy is

Sun

Earth

Moon

Water

38 / 70

The sum of all forms of molecular energies (Kinetic and Potential) of a substance is termed as?

UHS 2019
Physics
Work, Power and Energy
Elimination Tool:

A) Elastic energy

B) Absolute energy

C) Internal energy

D) Heat energy

39 / 70

In case of harmonic oscillator total energy remains

PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:

A) variable

B) infinity

C) constant

D) zero

40 / 70

A ball is released from a height h, above a table. Given that air resistance is negligible and 50% of its kinetic energy is converted to other forms of energy at each bounce, what will be the height reached after the second bounce?

h/4

h/2

h/8

h/3

41 / 70

In which of the following case(s) the work done be positive?

Object moves in the direction of Force

Object moves in opposite direction of Force

Object moves at Right Angle to the Force

Both a and c

42 / 70

What will be the speed a electron having an energy of 18.2 x10^14 Joule?

1.9*10^18

2.197*10^-25

2*10^7

None

43 / 70

Energy consumed by 60 watt bulb in 2 minutes is equal to:

UHS 2018
Physics
Work, Power and Energy
Elimination Tool:

A) 7.2 kilo joules

B) 720 joules

C) 120 joules

D) 72000 joules

44 / 70

Escape velocity of Jupiter is:

25.4

22.4

45 / 70

A 70 kg sportsman runs up a long flight of stairs in 4 seconds. The vertical height of the stairs is 4.5 m. What will be his power output in watts?

NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:

A) 7.7 x 10^2 W

B) 8.8 x 10^3 W

C) 9.5 x 10^3 W

D) 10.2 x 10^4 W

46 / 70

When we lift an object, we do work against which of the following:

1) Friction 2) Gravity

1 only

2 only

Either 1 or 2

Both 1 & 2

47 / 70

Minimum velocity needed to put the satellite into orbit is

7.9

5.6

6.2

None of these

48 / 70

What Is the power of a body if 1 N force is acted upon a body have a constant velocity of 10ms-1?

0.5

49 / 70

All the food that you eat in one day has about the same energy as — Liter of Petrol

1/3

1/9

50 / 70

Which of the following is a unit of Work?

Meter

Newton

joule

joule/second

51 / 70

Value of solar constant on the surface of Earth is:

1 kWm^2

1.4 kWm^-2

1 kWm^-2

1.4 kWm^2

52 / 70

A force of 10 N is acting on an object at angle of 120 degree through the distance of 4 m. Calculate the work done.

a) – 20 j b) 20 /

-20 J

20J

40J

-40J

53 / 70

Dimensions of U are

ML^2T^-2

ML^3T^-1

M^2L^2T

ML^-1T^-2

54 / 70

Joules

Watt/second

Newton Meter

Newton/meter

Watt second

55 / 70

Identify the examples of kinetic energy

A moving ball can break a glass window
A striking hammer can drive a nail
A stone thrown upward can lift itself against the force of gravity
NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) I ONLY

B) II ONLY

C) III ONLY

D) I, II AND III

56 / 70

A neutron travels a distance of 24 m in a time interval of 3.6 x 10^-4 s. Assuming its speed was constant. Find its kinetic energy. Take 1.7 x 10^-27 kg as the mass of the neutron.

NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) 37.702 x 10^-19 joule

B) 27.702 x 10^-19 joule

C) 17.70 x 10^-19 joule

D) 07.702 x 10^-29 joule

57 / 70

Which of the following field is dependent on the path?

Gravitational

Conservative

Non Conservative

None

58 / 70

A neutron travels a distance of 12 m in a time interval of 3.6 x 10 – 4s. Assuming its speed was constant, find its kinetic energy. (take 1.7 x 10 – 27 kg is the mass of neutron)

NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:

A) 3.14 eV

B) 5.78 eV

C) 7.71 eV

D) 8.89 eV

59 / 70

A body of mass m moving with velocity v has a kinetic energy K. If its velocity is increased by 25%, what will be the work done in terms of K.E?

0.25 K

Zero

2.5 K

0.56 K

60 / 70

Escape velocity of moon is

2.38 km/s

3.38 km/s

4.38 km/s

5.38 km/s

61 / 70

The potential energy of a particle having a mass of 0.5 kg, moving along the x axis, is given by U= 2*x(x-3), where x = the distance moved by the particle. The speed of the particle will be maximum when it has moved a distance of:

PMC Sample 2
Physics
Work, Power and Energy
Elimination Tool:

A) 1 m

B) 1.5 m

C) 2 m

D) 3 m

62 / 70

The K.E. of a body of mass 2kg and momentum of 2N is:

PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:

A) 1 J

B) 2 J

C) 3 J

D) 4 J

63 / 70

1 kilowatt hour =

NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:

A) 1.6 x 10^-19 J

B) 3.6×10^6 J

C) 9.1 x 10^31J

D) 1.67x 10^-27 J

64 / 70

Two bodies X of mass 4kg and Y of mass 6 kg have same linear momentum. If the kinetic energy of Y is 48 J then kinetic energy of body X is:

48 J

64 J

72 J

96 J

65 / 70

Kilowatt-hour is a unit of?

NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:

A) Electric Energy

B) Power

C) Momentum

D) Torque

66 / 70

The sum of Kinetic energy and the Potential energy is always constant to provide _____ .

NTS 2019
Physics
Work, Power and Energy
Elimination Tool:

A) There is a greater force of friction involved during motion

B) The body is in simple harmonic motion

C) There is less force of friction involved during motion

D) No force of friction involved during motion

67 / 70

The rate at which work is being done is called:

UHS 2018
Physics
Work, Power and Energy
Elimination Tool:

A) Power

B) Energy

C) Density

D) Force

68 / 70

Calculate the final kinetic energy when a shop keeper pushes a fruit crate, initially at rest, towards another shopkeeper by exerting a constant horizontal force F of magnitude 5N through a distance of 1 meter.

NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:

A) 2 J

B) 3 J

C) 5 J

D) 7 J

69 / 70

Which unit expresses work per unit charge?

NTS 2017
Physics
Work, Power and Energy
Elimination Tool:

A) Hertz

B) Watt

C) Joule

D) Volt

70 / 70

A bullet fired from gun can pierce a target due to

PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:

A) heat energy

B) mechanical energy

C) acceleration

D) kinetic energy

Your score is

The average score is 55%

Importance of Work and Energy in Competitive Physics

A clear understanding of Work and Energy helps students solve problems involving motion, calculate energy changes, and analyze physical systems. Moreover, it allows students to apply conservation laws to real-world situations and understand energy transformations. Topics such as mechanical advantage, efficiency, and potential energy in various systems are commonly asked in entry tests. By practicing chapter-wise problems, MCQs, and diagrams, students can strengthen conceptual clarity, improve accuracy, and boost exam performance.

Effective Preparation and Practice Resources for Work and Energy

To prepare effectively, students should revise formulas, practice numerical problems, and attempt mock tests. In addition, solving past papers and exam-focused questions helps students identify key areas and frequently tested concepts. PLS Academy provides structured learning resources that help students systematically master Work and Energy and perform confidently in physics entry tests and FSC First Year board examinations.

JazakAllah.

PLS Academy – LearnoSpot

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