100 Important MCQs (Level -1) on Work and Energy, Physics (Unit-Wise MCQs Practice):

👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

Whether you are preparing for board examinations, chapter tests, college assessments, or competitive entrance exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive MCQ collection is designed to help you master Work and Energy. The questions are arranged progressively—from basic concepts to advanced numerical problems and higher-order thinking—ensuring complete and systematic preparation for every type of examination.

This chapter-wise MCQ collection includes:

100 Basic MCQs – Covering fundamental concepts, definitions, work, energy, power, SI units, positive, negative and zero work, gravitational field, gravitational potential, conservative and non-conservative forces.

100 Advanced & Numerical MCQs – Focusing on calculations involving work done by constant and variable forces, force-displacement graphs, kinetic and potential energy, work-energy theorem, power, efficiency, gravitational field strength, gravitational potential, and escape velocity.

50 Higher-Order Thinking Skills (HOTS) MCQs – Designed to strengthen analytical reasoning, conceptual understanding, graph interpretation, real-life applications, and multi-concept problem-solving abilities.

This MCQ collection covers:

Work and its calculation using force and displacement
Positive, negative, and zero work
Force-displacement graphs and work calculation
Kinetic energy, gravitational potential energy, and mechanical energy
Gravitational field, field strength, and gravitational potential
Conservative and non-conservative forces
Work done by gravity and conservation of mechanical energy
Escape velocity and its applications
Power, efficiency, and energy transformations
Work-energy theorem in resistive media
Conventional and non-conventional energy sources
Real-life applications and numerical problem-solving

Every MCQ includes the correct answer along with a clear, concept-based explanation to strengthen understanding, improve problem-solving skills, and reinforce important Physics concepts.

This question bank helps students to:

Build a strong conceptual foundation in Work and Energy
Master numerical problem-solving techniques
Understand gravitational field, potential, and escape velocity
Apply the work-energy theorem confidently
Improve analytical reasoning and HOTS skills
Avoid common examination mistakes
Increase speed, accuracy, and confidence in objective-type questions
Prepare effectively for both board examinations and competitive entrance tests

With 250 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 50 HOTS questions, this all-in-one MCQ bank provides complete preparation for Work and Energy. It is an excellent study resource for strengthening concepts, improving exam performance, and achieving success in both school and competitive Physics examinations.

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Work and Energy MCQs (Level-II) – 100 Advanced & Numerical MCQs (MCQs 101–200)

MCQ No. 1

Work is said to be done when:

a. A force acts on a body without causing displacement

b. A body is at rest

c. A force acts on a body and produces displacement

d. A body moves without any force

Correct Answer: c. A force acts on a body and produces displacement

Explanation:
In physics, work is done only when a force acting on an object causes it to move through a displacement. If there is no displacement, no work is done regardless of the magnitude of the force.

MCQ No. 2

The SI unit of work is:

a. Newton

b. Joule

c. Watt

d. Pascal

Correct Answer: b. Joule

Explanation:
The SI unit of work is the joule (J). One joule of work is done when a force of one newton moves an object through one metre in the direction of the force.

MCQ No. 3

The mathematical expression for work done by a constant force is:

a. $W = F + d$

b. $W = F d$

c. $W = \frac{F}{d}$

d. $W = Fd^2$

Correct Answer: b. $W = Fd$

Explanation:
When the applied force and displacement are in the same direction, work is calculated by multiplying the force by the displacement.

W = Fd

MCQ No. 4

Work is a:

a. Vector quantity

b. Scalar quantity

c. Dimensionless quantity

d. Fundamental quantity

Correct Answer: b. Scalar quantity

Explanation:
Work has only magnitude and no direction. Therefore, it is a scalar quantity.

MCQ No. 5

When the force and displacement are in the same direction, the work done is:

a. Negative

b. Zero

c. Positive

d. Infinite

Correct Answer: c. Positive

Explanation:
If the force acts in the same direction as the displacement, the angle between them is $0^\circ$ , and the work done is positive.

MCQ No. 6

If a person pushes a wall with a large force but the wall does not move, the work done is:

a. Positive

b. Negative

c. Zero

d. Maximum

Correct Answer: c. Zero

Explanation:
Since the wall does not move, the displacement is zero. Therefore, no work is done even though a force is applied.

MCQ No. 7

Which of the following quantities is essential for work to be done?

a. Time only

b. Force only

c. Displacement only

d. Both force and displacement

Correct Answer: d. Both force and displacement

Explanation:
Work requires both an applied force and displacement of the object. If either is absent, the work done is zero.

MCQ No. 8

The SI unit "joule" is equal to:

a. N/m

b. N·m

c. kg/m

d. N/s

Correct Answer: b. N·m

Explanation:
One joule is equal to one newton metre.

1\text{ J}=1\text{ N}\cdot\text{m}

MCQ No. 9

Which quantity has the same SI unit as work?

a. Force

b. Energy

c. Pressure

d. Acceleration

Correct Answer: b. Energy

Explanation:
Both work and energy are measured in joules because work is the transfer of energy.

MCQ No. 10

A force of 15 N moves an object through 4 m in the direction of the force. The work done is:

a. 30 J

b. 45 J

c. 60 J

d. 75 J

Correct Answer: c. 60 J

Explanation:

W=Fd

W=15\times4=60\text{ J}

MCQ No. 11

Which of the following is an example of positive work?

a. A book falling from a table

b. A person holding a bag without moving

c. A person pushing a wall that does not move

d. A satellite moving in a circular orbit

Correct Answer: a. A book falling from a table

Explanation:
As the book falls, gravity and displacement are in the same direction, so gravity performs positive work.

MCQ No. 12

Negative work is done when the force acts:

a. In the same direction as displacement

b. Opposite to the direction of displacement

c. Perpendicular to displacement

d. At an angle of $45^\circ$

Correct Answer: b. Opposite to the direction of displacement

Explanation:
When force acts opposite to displacement, the angle is $180^\circ$ , making the work done negative.

MCQ No. 13

Which force usually performs negative work on a moving object?

a. Gravitational force during free fall

b. Frictional force

c. Applied force

d. Magnetic force on a stationary object

Correct Answer: b. Frictional force

Explanation:
Friction opposes motion and therefore performs negative work, reducing the object's mechanical energy.

MCQ No. 14

If the displacement of an object is doubled while the applied force remains constant, the work done becomes:

a. Half

b. Double

c. Four times

d. Unchanged

Correct Answer: b. Double

Explanation:
Since

W=Fd

work is directly proportional to displacement when the force is constant.

MCQ No. 15

If the applied force is doubled while the displacement remains constant, the work done becomes:

a. Half

b. Double

c. Four times

d. Unchanged

Correct Answer: b. Double

Explanation:
Work is directly proportional to the applied force. Doubling the force doubles the work done.

MCQ No. 16

The dimension of work is:

a. $[M L T^{- 1}]$

b. $[ML^2T^{-2}]$

c. $[ML^{-1}T^{-2}]$

d. $[M^{2} L T^{- 2}]$

Correct Answer: b. $[M L^{2} T^{- 2}]$

Explanation:
Since work is the product of force and displacement,

[W]=[MLT^{-2}]\times[L]=[ML^2T^{-2}]

MCQ No. 17

Which of the following situations represents zero work?

a. A car accelerating on a road

b. A box sliding on a floor

c. A person carrying a suitcase horizontally at constant height

d. A stone falling freely

Correct Answer: c. A person carrying a suitcase horizontally at constant height

Explanation:
The supporting force is vertical, while the displacement is horizontal. Since the force is perpendicular to the displacement, the work done by the supporting force is zero.

MCQ No. 18

The angle between force and displacement for positive work is:

a. $180^\circ$

b. $90^\circ$

c. Less than $90^\circ$

d. Greater than $90^\circ$

Correct Answer: c. Less than $90^\circ$

Explanation:
Positive work is done whenever the angle between the force and displacement is less than $90^\circ$ .

MCQ No. 19

The work done by gravity on an object moving downward is:

a. Positive

b. Negative

c. Zero

d. Infinite

Correct Answer: a. Positive

Explanation:
Gravity and displacement are in the same direction during downward motion, so gravity performs positive work.

MCQ No. 20

A force acts perpendicular to the displacement of an object. The work done is:

a. Positive

b. Negative

c. Zero

d. Maximum

Correct Answer: c. Zero

Explanation:
When force and displacement are perpendicular,

W=Fd\cos90^\circ=0

Hence, no work is done.

MCQ No. 21

Which physical quantity measures the transfer of energy by a force?

a. Power

b. Work

c. Momentum

d. Pressure

Correct Answer: b. Work

Explanation:
Work is defined as the transfer of energy when a force acts on an object and produces displacement.

MCQ No. 22

A body is displaced by 8 m under a constant force of 25 N. The work done is:

a. 100 J

b. 150 J

c. 200 J

d. 250 J

Correct Answer: c. 200 J

Explanation:

W=Fd=25\times8=200\text{ J}

MCQ No. 23

The work done by friction is generally:

a. Positive

b. Negative

c. Zero

d. Infinite

Correct Answer: b. Negative

Explanation:
Friction opposes the direction of motion, so it performs negative work and reduces the object's mechanical energy.

MCQ No. 24

Which one of the following quantities is not required to calculate work done by a constant force acting in the direction of motion?

a. Force

b. Displacement

c. Time

d. Direction of force

Correct Answer: c. Time

Explanation:
For constant force acting in the direction of displacement, work depends only on the applied force and displacement. Time is not involved in the calculation.

MCQ No. 25

Which statement best defines work in physics?

a. Work is the product of mass and acceleration.

b. Work is the product of force and displacement in the direction of the force.

c. Work is equal to force divided by displacement.

d. Work is the rate of doing energy.

Correct Answer: b. Work is the product of force and displacement in the direction of the force.

Explanation:
Work is defined as the product of the applied force and the displacement produced in the direction of that force. It is one of the fundamental concepts used to describe energy transfer in mechanics.

MCQ No. 26

The work done by a force depends upon:

a. Force only

b. Displacement only

c. Both force and displacement

d. Time only

Correct Answer: c. Both force and displacement

Explanation:
Work is calculated by multiplying the force by the displacement in the direction of the force. Therefore, both force and displacement are required.

MCQ No. 27

The formula $W = Fd \cos\theta$ is used when:

a. Force and displacement are always parallel

b. Force acts at an angle to the displacement

c. Displacement is zero

d. Force is zero

Correct Answer: b. Force acts at an angle to the displacement

Explanation:
When the applied force makes an angle $\theta$ with the displacement, only the component of the force along the displacement does work.

MCQ No. 28

A force of 30 N moves an object through 5 m in the direction of the force. The work done is:

a. 100 J

b. 120 J

c. 150 J

d. 180 J

Correct Answer: c. 150 J

Explanation:

W=Fd=30\times5=150\text{ J}

MCQ No. 29

If no force acts on an object, the work done is:

a. Positive

b. Negative

c. Zero

d. Infinite

Correct Answer: c. Zero

Explanation:
Without an applied force, no work can be done, even if the object is moving.

MCQ No. 30

When the angle between force and displacement is $180^\circ$ , the work done is:

a. Positive

b. Negative

c. Zero

d. Maximum

Correct Answer: b. Negative

Explanation:
Since

\cos180^\circ=-1,

the work done is negative because the force opposes the displacement.

MCQ No. 31

Which of the following is an example of zero work?

a. A satellite revolving around the Earth

b. A child climbing stairs

c. A stone falling freely

d. A car accelerating on a road

Correct Answer: a. A satellite revolving around the Earth

Explanation:
The gravitational force acts toward the Earth's center, while the satellite's instantaneous displacement is tangential to its orbit. Since the force is perpendicular to the displacement, the work done is zero.

MCQ No. 32

One joule is equal to:

a. One watt per second

b. One newton acting through one metre

c. One kilogram metre

d. One pascal metre

Correct Answer: b. One newton acting through one metre

Explanation:
One joule is the work done when a force of one newton moves an object through one metre in the direction of the force.

MCQ No. 33

Which quantity is measured in newtons?

a. Work

b. Energy

c. Force

d. Power

Correct Answer: c. Force

Explanation:
The SI unit of force is the newton (N).

MCQ No. 34

The work done in lifting an object vertically upward is stored as:

a. Kinetic energy

b. Heat energy

c. Gravitational potential energy

d. Sound energy

Correct Answer: c. Gravitational potential energy

Explanation:
When an object is lifted, the work done against gravity is stored as gravitational potential energy.

MCQ No. 35

Which expression gives the gravitational potential energy near the Earth's surface?

a. $PE=\frac12mv^2$

b. $PE=mgh$

c. $PE=Fd$

d. $PE=ma$

Correct Answer: b. $PE=mgh$

Explanation:
Near the Earth's surface, gravitational potential energy depends on the mass, gravitational acceleration, and height.

MCQ No. 36

The SI unit of gravitational potential energy is:

a. Newton

b. Joule

c. Watt

d. Pascal

Correct Answer: b. Joule

Explanation:
Gravitational potential energy is a form of energy, so its SI unit is the joule (J).

MCQ No. 37

A body of mass 5 kg is raised through a height of 4 m. Taking $g=10\,\text{m/s}^2$ , the gain in potential energy is:

a. 100 J

b. 150 J

c. 200 J

d. 250 J

Correct Answer: c. 200 J

Explanation:

PE=mgh

=5\times10\times4=200\text{ J}

MCQ No. 38

Gravitational potential energy depends upon:

a. Mass and height

b. Speed only

c. Time only

d. Temperature only

Correct Answer: a. Mass and height

Explanation:
According to

PE=mgh,

gravitational potential energy depends directly on the mass of the object and its height above the reference level.

MCQ No. 39

The force responsible for gravitational potential energy is:

a. Magnetic force

b. Electrostatic force

c. Gravitational force

d. Nuclear force

Correct Answer: c. Gravitational force

Explanation:
Gravitational potential energy arises because of the gravitational attraction between masses.

MCQ No. 40

Gravitational field strength is defined as:

a. Work done per unit mass

b. Force per unit mass

c. Energy per unit mass

d. Power per unit mass

Correct Answer: b. Force per unit mass

Explanation:
Gravitational field strength is the gravitational force experienced by a unit mass placed at a point in the field.

MCQ No. 41

The SI unit of gravitational field strength is:

a. J/kg

b. N/kg

c. W/kg

d. Pa

Correct Answer: b. N/kg

Explanation:
Gravitational field strength is measured in newtons per kilogram (N/kg), which is equivalent to m/s².

MCQ No. 42

The gravitational field around the Earth is produced because of its:

a. Temperature

b. Mass

c. Rotation

d. Shape

Correct Answer: b. Mass

Explanation:
Every object with mass produces a gravitational field that attracts other masses.

MCQ No. 43

The value of gravitational field strength near the Earth's surface is approximately:

a. 5 m/s²

b. 7.5 m/s²

c. 9.8 m/s²

d. 15 m/s²

Correct Answer: c. 9.8 m/s²

Explanation:
Near the Earth's surface, the gravitational field strength is approximately $9.8\,\text{N/kg}$ or $9.8\,\text{m/s}^2$

MCQ No. 44

A body of mass 2 kg experiences a gravitational force of 19.6 N. The gravitational field strength is:

a. 4.9 N/kg

b. 9.8 N/kg

c. 19.6 N/kg

d. 39.2 N/kg

Correct Answer: b. 9.8 N/kg

Explanation:

g=\frac{F}{m}

=\frac{19.6}{2}=9.8\text{ N/kg}

MCQ No. 45

Which of the following is a conservative force?

a. Friction

b. Air resistance

c. Gravitational force

d. Viscous force

Correct Answer: c. Gravitational force

Explanation:
The work done by gravity depends only on the initial and final positions, making it a conservative force.

MCQ No. 46

Which of the following is a non-conservative force?

a. Gravitational force

b. Spring force

c. Electrostatic force

d. Frictional force

Correct Answer: d. Frictional force

Explanation:
The work done by friction depends on the path followed and converts mechanical energy into heat.

MCQ No. 47

The work done by gravity around a closed path is:

a. Positive

b. Negative

c. Equal to potential energy

d. Zero

Correct Answer: d. Zero

Explanation:
Since gravity is a conservative force, the total work done around any closed path is zero.

MCQ No. 48

Gravitational potential is defined as:

a. Force per unit mass

b. Work done in bringing unit mass from infinity to a point

c. Energy possessed due to motion

d. Work done per unit displacement

Correct Answer: b. Work done in bringing unit mass from infinity to a point

Explanation:
Gravitational potential is the work done per unit mass in bringing a test mass from infinity to a specified point in a gravitational field.

MCQ No. 49

The SI unit of gravitational potential is:

a. Joule

b. Newton

c. Joule per kilogram

d. Watt

Correct Answer: c. Joule per kilogram

Explanation:
Gravitational potential is measured as work done per unit mass. Therefore, its SI unit is joule per kilogram (J/kg).

MCQ No. 50

Which statement correctly describes gravitational potential?

a. It is force acting on a unit mass.

b. It is work done per unit mass in bringing a body from infinity to a given point.

c. It is energy possessed by a moving object.

d. It is the rate of doing work.

Correct Answer: b. It is work done per unit mass in bringing a body from infinity to a given point.

Explanation:
Gravitational potential is a measure of the work required to bring a unit mass from infinity to a specified point in a gravitational field. It is expressed in joules per kilogram (J/kg).

MCQ No. 51

The gravitational potential at infinity is conventionally taken as:

a. Positive

b. Negative

c. Zero

d. Infinite

Correct Answer: c. Zero

Explanation:
By convention, gravitational potential is considered zero at infinity. This reference point is used to calculate gravitational potential at all other points in a gravitational field.

MCQ No. 52

The gravitational potential at the Earth's surface is:

a. Positive

b. Negative

c. Zero

d. Infinite

Correct Answer: b. Negative

Explanation:
Since gravitational potential is measured relative to infinity, the Earth's surface has a negative gravitational potential because work must be done against gravity to move a body from the Earth to infinity.

MCQ No. 53

Escape velocity is the minimum velocity required for an object to:

a. Move in a circular path

b. Reach the highest point and return

c. Escape permanently from a planet's gravitational field

d. Travel at constant speed

Correct Answer: c. Escape permanently from a planet's gravitational field

Explanation:
Escape velocity is the minimum speed required for an object to escape a planet's gravitational attraction without further propulsion.

MCQ No. 54

The escape velocity depends upon:

a. Mass of the escaping object

b. Mass and radius of the planet

c. Colour of the planet

d. Shape of the object

Correct Answer: b. Mass and radius of the planet

Explanation:
The escape velocity is given by

v_e=\sqrt{\frac{2GM}{R}}

It depends on the planet's mass and radius but not on the mass of the escaping object.

MCQ No. 55

The approximate escape velocity from the Earth is:

a. 7.9 km/s

b. 9.8 km/s

c. 11.2 km/s

d. 15.0 km/s

Correct Answer: c. 11.2 km/s

Explanation:
The escape velocity from the Earth's surface is approximately 11.2 km/s.

MCQ No. 56

Power is defined as:

a. Force × displacement

b. Energy × time

c. Work done per unit time

d. Force per unit area

Correct Answer: c. Work done per unit time

Explanation:
Power is the rate at which work is done or energy is transferred.

P=\frac{W}{t}

MCQ No. 57

The SI unit of power is:

a. Joule

b. Newton

c. Watt

d. Pascal

Correct Answer: c. Watt

Explanation:
The SI unit of power is the watt (W). One watt is equal to one joule of work done per second.

MCQ No. 58

One watt is equal to:

a. 1 N·m

b. 1 J/s

c. 1 N/s

d. 1 kg·m/s

Correct Answer: b. 1 J/s

Explanation:
Power is defined as work done per unit time.

1\text{ W}=1\text{ J/s}

MCQ No. 59

Power can also be expressed as:

a. $P=Fv$

b. $P=mv$

c. $P=Fd$

d. $P=ma$

Correct Answer: a. $P=Fv$

Explanation:
When the force and velocity are in the same direction,

P=Fv

This equation gives the instantaneous power delivered by the force.

MCQ No. 60

A machine does 500 J of work in 10 seconds. Its power is:

a. 25 W

b. 40 W

c. 50 W

d. 100 W

Correct Answer: c. 50 W

Explanation:

P=\frac{W}{t}

=\frac{500}{10}=50\text{ W}

MCQ No. 61

Efficiency is the ratio of:

a. Input work to output work

b. Useful output energy to input energy

c. Output power to time

d. Force to displacement

Correct Answer: b. Useful output energy to input energy

Explanation:
Efficiency measures how effectively a machine converts input energy into useful output energy.

\eta=\frac{\text{Useful Output}}{\text{Input}}\times100\%

MCQ No. 62

Efficiency is usually expressed as:

a. Joules

b. Watts

c. Percentage

d. Newtons

Correct Answer: c. Percentage

Explanation:
Efficiency is a dimensionless ratio and is commonly expressed as a percentage.

MCQ No. 63

An ideal machine has an efficiency of:

a. 50%

b. 75%

c. 90%

d. 100%

Correct Answer: d. 100%

Explanation:
An ideal machine has no energy losses due to friction or other resistive forces. Therefore, all input energy is converted into useful output.

MCQ No. 64

The main cause of energy loss in practical machines is:

a. Gravity

b. Friction

c. Magnetism

d. Electricity

Correct Answer: b. Friction

Explanation:
Friction converts useful mechanical energy into heat and sound, reducing the efficiency of machines.

MCQ No. 65

The work done against friction is mainly converted into:

a. Light energy

b. Heat energy

c. Nuclear energy

d. Electrical energy

Correct Answer: b. Heat energy

Explanation:
Friction converts mechanical energy into thermal energy, which is dissipated into the surroundings.

MCQ No. 66

Which of the following is a conventional source of energy?

a. Wind energy

b. Solar energy

c. Coal

d. Tidal energy

Correct Answer: c. Coal

Explanation:
Coal is a fossil fuel and is considered a conventional source of energy because it has been widely used for many years.

MCQ No. 67

Which of the following is a non-conventional source of energy?

a. Petroleum

b. Natural gas

c. Solar energy

d. Coal

Correct Answer: c. Solar energy

Explanation:
Solar energy is renewable and environmentally friendly, making it a non-conventional source of energy.

MCQ No. 68

Wind energy is classified as:

a. Conventional energy

b. Non-conventional energy

c. Fossil fuel

d. Nuclear energy

Correct Answer: b. Non-conventional energy

Explanation:
Wind energy is renewable, sustainable, and does not produce air pollution during electricity generation.

MCQ No. 69

Which renewable energy source uses flowing water to generate electricity?

a. Biomass energy

b. Hydroelectric energy

c. Coal energy

d. Petroleum energy

Correct Answer: b. Hydroelectric energy

Explanation:
Hydroelectric power stations convert the potential and kinetic energy of flowing water into electrical energy.

MCQ No. 70

Which renewable energy source uses sunlight directly?

a. Coal

b. Petroleum

c. Solar energy

d. Natural gas

Correct Answer: c. Solar energy

Explanation:
Solar panels convert sunlight directly into electrical energy using photovoltaic cells.

MCQ No. 71

Which source of energy utilizes heat from inside the Earth?

a. Wind energy

b. Solar energy

c. Geothermal energy

d. Hydroelectric energy

Correct Answer: c. Geothermal energy

Explanation:
Geothermal energy uses heat from beneath the Earth's surface to generate electricity and provide heating.

MCQ No. 72

Which of the following is an advantage of renewable energy sources?

a. They produce unlimited pollution.

b. They are exhaustible.

c. They are environmentally friendly.

d. They increase greenhouse gas emissions.

Correct Answer: c. They are environmentally friendly.

Explanation:
Renewable energy sources such as solar and wind energy produce little or no pollution during operation and help reduce greenhouse gas emissions.

MCQ No. 73

Which of the following is a limitation of fossil fuels?

a. They are renewable.

b. They are available in unlimited quantities.

c. They cause environmental pollution.

d. They produce no greenhouse gases.

Correct Answer: c. They cause environmental pollution.

Explanation:
Burning fossil fuels releases carbon dioxide and other pollutants, contributing to global warming and air pollution.

MCQ No. 74

The law of conservation of energy states that energy can:

a. Be created but not destroyed.

b. Be destroyed but not created.

c. Neither be created nor destroyed but only transformed from one form to another.

d. Be lost permanently during motion.

Correct Answer: c. Neither be created nor destroyed but only transformed from one form to another.

Explanation:
The total energy of an isolated system remains constant, although it may change from one form to another.

MCQ No. 75

Which statement best explains the relationship between work and energy?

a. Work and energy are unrelated quantities.

b. Work is the transfer of energy when a force causes displacement.

c. Energy is produced only by machines.

d. Work is always equal to power.

Correct Answer: b. Work is the transfer of energy when a force causes displacement.

Explanation:
Work is the process through which energy is transferred from one object or system to another by the action of a force causing displacement. This relationship forms the basis of the work-energy theorem and many applications in mechanics.

MCQ No. 76

Energy is defined as the:

a. Product of force and displacement

b. Capacity to do work

c. Rate of doing work

d. Force per unit mass

Correct Answer: b. Capacity to do work

Explanation:
Energy is the ability or capacity of a body or system to perform work. It exists in many forms, such as kinetic, potential, thermal, and electrical energy.

MCQ No. 77

The SI unit of energy is:

a. Watt

b. Newton

c. Joule

d. Pascal

Correct Answer: c. Joule

Explanation:
The SI unit of energy is the joule (J), which is the same as the SI unit of work because work is a transfer of energy.

MCQ No. 78

Which form of energy is possessed by a body due to its motion?

a. Potential energy

b. Kinetic energy

c. Chemical energy

d. Nuclear energy

Correct Answer: b. Kinetic energy

Explanation:
Kinetic energy is the energy possessed by a body because of its motion. A stationary object has zero kinetic energy.

MCQ No. 79

The kinetic energy of a body is given by:

a. $KE = mgh$

b. $KE = \frac{1}{2}mv^2$

c. $KE = Fd$

d. $KE = ma$

Correct Answer: b. $K E = \frac{1}{2} m v^{2}$

Explanation:
The kinetic energy of a moving body depends on its mass and the square of its speed.

KE=\frac12mv^2

MCQ No. 80

A body of mass 4 kg moves with a speed of 5 m/s. Its kinetic energy is:

a. 25 J

b. 40 J

c. 50 J

d. 100 J

Correct Answer: c. 50 J

Explanation:

KE=\frac12mv^2

=\frac12\times4\times5^2 =2\times25 =50\text{ J}

MCQ No. 81

If the mass of a moving body is doubled while its speed remains unchanged, its kinetic energy becomes:

a. Half

b. Double

c. Four times

d. Unchanged

Correct Answer: b. Double

Explanation:
Since kinetic energy is directly proportional to mass,

KE=\frac12mv^2,

doubling the mass doubles the kinetic energy.

MCQ No. 82

If the speed of a body is doubled, its kinetic energy becomes:

a. Double

b. Triple

c. Four times

d. Eight times

Correct Answer: c. Four times

Explanation:
Kinetic energy is proportional to the square of the speed.

KE\propto v^2

Therefore, doubling the speed increases the kinetic energy by a factor of four.

MCQ No. 83

A stationary body possesses:

a. Kinetic energy only

b. Potential energy only

c. No kinetic energy

d. Infinite energy

Correct Answer: c. No kinetic energy

Explanation:
Since the velocity of a stationary body is zero,

KE=\frac12mv^2=0.

MCQ No. 84

Gravitational potential energy is associated with a body's:

a. Speed

b. Position

c. Temperature

d. Colour

Correct Answer: b. Position

Explanation:
Gravitational potential energy depends on the position of a body relative to a chosen reference level.

MCQ No. 85

The work done in raising an object is stored as:

a. Heat energy

b. Sound energy

c. Gravitational potential energy

d. Electrical energy

Correct Answer: c. Gravitational potential energy

Explanation:
When work is done against gravity, the energy is stored as gravitational potential energy.

MCQ No. 86

The total mechanical energy of a body is the sum of:

a. Heat energy and sound energy

b. Kinetic energy and potential energy

c. Electrical energy and chemical energy

d. Nuclear energy and thermal energy

Correct Answer: b. Kinetic energy and potential energy

Explanation:
Mechanical energy consists of the kinetic energy due to motion and the potential energy due to position.

MCQ No. 87

In the absence of friction, the total mechanical energy of a system:

a. Increases continuously

b. Decreases continuously

c. Remains constant

d. Becomes zero

Correct Answer: c. Remains constant

Explanation:
When only conservative forces act, the law of conservation of mechanical energy states that the total mechanical energy remains constant.

MCQ No. 88

During the free fall of an object (ignoring air resistance), gravitational potential energy is converted into:

a. Electrical energy

b. Heat energy

c. Kinetic energy

d. Nuclear energy

Correct Answer: c. Kinetic energy

Explanation:
As an object falls, its height decreases and its speed increases. Thus, gravitational potential energy is converted into kinetic energy.

MCQ No. 89

Which force is responsible for the conversion of potential energy into kinetic energy during free fall?

a. Friction

b. Magnetic force

c. Gravitational force

d. Electrostatic force

Correct Answer: c. Gravitational force

Explanation:
Gravity accelerates falling objects, converting their gravitational potential energy into kinetic energy.

MCQ No. 90

Which of the following quantities is a scalar?

a. Force

b. Velocity

c. Displacement

d. Energy

Correct Answer: d. Energy

Explanation:
Energy has magnitude only and no direction. Therefore, it is a scalar quantity.

MCQ No. 91

The work-energy theorem states that the net work done on a body is equal to the:

a. Change in momentum

b. Change in kinetic energy

c. Change in potential energy

d. Product of force and time

Correct Answer: b. Change in kinetic energy

Explanation:
The work-energy theorem establishes that the net work done by all forces acting on a body equals the change in its kinetic energy.

MCQ No. 92

Which quantity is directly proportional to the square of the speed of a body?

a. Momentum

b. Force

c. Kinetic energy

d. Power

Correct Answer: c. Kinetic energy

Explanation:
Since

KE=\frac12mv^2,

kinetic energy varies directly with the square of the speed.

MCQ No. 93

A body of mass 3 kg is lifted through a height of 10 m. Taking $g=10\,\text{m/s}^2$ , its gain in gravitational potential energy is:

a. 150 J

b. 200 J

c. 300 J

d. 600 J

Correct Answer: c. 300 J

Explanation:

PE=mgh

=3\times10\times10=300\text{ J}

MCQ No. 94

If the height of an object is doubled while its mass remains constant, its gravitational potential energy becomes:

a. Half

b. Double

c. Four times

d. Unchanged

Correct Answer: b. Double

Explanation:
Gravitational potential energy is directly proportional to height.

PE=mgh

Doubling the height doubles the potential energy.

MCQ No. 95

The efficiency of a machine can never be greater than:

a. 25%

b. 50%

c. 75%

d. 100%

Correct Answer: d. 100%

Explanation:
According to the law of conservation of energy, a machine cannot produce more useful energy than it receives. Therefore, its efficiency cannot exceed 100%.

MCQ No. 96

Which of the following quantities is measured in watts?

a. Work

b. Power

c. Energy

d. Potential energy

Correct Answer: b. Power

Explanation:
The watt (W) is the SI unit of power, representing one joule of work done per second.

MCQ No. 97

A machine receives 1000 J of energy and produces 800 J of useful output. Its efficiency is:

a. 60%

b. 70%

c. 80%

d. 90%

Correct Answer: c. 80%

Explanation:

\eta=\frac{800}{1000}\times100 =80\%

MCQ No. 98

Which of the following renewable energy sources is most suitable for regions with strong and continuous winds?

a. Coal

b. Petroleum

c. Wind energy

d. Natural gas

Correct Answer: c. Wind energy

Explanation:
Wind turbines efficiently convert the kinetic energy of moving air into electrical energy in areas with consistent wind.

MCQ No. 99

The main purpose of improving the efficiency of machines is to:

a. Increase energy losses

b. Reduce useful output

c. Minimize energy losses and obtain more useful work

d. Increase friction

Correct Answer: c. Minimize energy losses and obtain more useful work

Explanation:
Improving efficiency reduces energy losses due to friction, heat, and sound, allowing a greater fraction of the input energy to become useful output.

MCQ No. 100

Which statement correctly summarizes the concepts of work, energy, and power?

a. Work, energy, and power are measured in the same SI unit.

b. Work is the transfer of energy, energy is the capacity to do work, and power is the rate of doing work.

c. Power is the capacity to do work, while energy is the rate of doing work.

d. Work and power are vector quantities.

Correct Answer: b. Work is the transfer of energy, energy is the capacity to do work, and power is the rate of doing work.

Explanation:
Work is the transfer of energy by a force acting through a displacement. Energy is the ability to do work, while power measures how quickly work is done or energy is transferred. These three concepts are fundamental to understanding mechanics and energy transformations.

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Work and Energy – 100 Basic MCQs with Answers & Explanations | Board & MDCAT Preparation

100 Important MCQs (Level -1) on Work and Energy, Physics (Unit-Wise MCQs Practice):

👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

This MCQ collection covers:

This question bank helps students to:

Work and Energy MCQs (Level-II) – 100 Advanced & Numerical MCQs (MCQs 101–200)

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