Multiple Choice Questions

WORK AND ENERGY

Updated for CBSE 2027
94+ Practice Questions
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Practice Questions with Answers

Total 94 questions available

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Q. 1
Two bodies of masses m and 4m are moving with equal kinetic energy. The ratio of velocities is:
A
1:2
B
4:5
C
2:1
D
3:4
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Q. 2
If a force of F newton moves a body with constant speed v, the power delivered by it is:
A
Fv
B
F2v
C
v/F
D
F/v
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Q. 3
How is work defined scientifically when force acts in the direction of displacement?
A
Work = Displacement / Force
B
Work = Force / Displacement
C
Work = Force × Displacement
D
Work = Force + Displacement
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Q. 4
Choose the correctly matched pair:
A
Work - Force divided by distance
B
Power - Rate of doing work
C
Mechanical Energy - Only potential energy
D
Kinetic Energy - Potential energy of a raised object
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Q. 5
What is the formula for gravitational potential energy?
A
Ep = mv
B
Ep = 1/2 mv²
C
Ep = Fd
D
Ep = mgh
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Q. 6
If a bullock pulls a cart and it moves, what can we say about the work done?
A
Work is partial
B
No work is done
C
Work is negative
D
Work is done
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Q. 7
What distinguishes scientific work from everyday work?
A
Mental engagement
B
Time spent
C
Displacement caused
D
Effort expended
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Q. 8
What happens to work done when the displacement is zero?
A
Work is positive
B
Work is zero
C
Work is infinite
D
Work is negative
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Q. 9
Why is it important to understand the scientific conception of work?
A
It reduces fatigue
B
It improves concentration
C
It clarifies the meaning of work
D
It helps in physical fitness
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Q. 10
When an object falls freely, what happens to its potential and kinetic energy?
A
They both decrease simultaneously
B
Potential energy decreases, kinetic energy increases
C
They both increase
D
They remain constant
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Q. 11
How do we generally perceive activities like playing or watching a movie?
A
As waste of time
B
As productive work
C
As leisure activities
D
As hard work
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Q. 12
What happens to K.E. of a body when 3/4 of its mass is removed and its velocity is doubled?
A
Becomes 4 times
B
No change
C
Becomes 1/4 times
D
Becomes 1/2 times
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Q. 13
What is essential for work to be recognized scientifically?
A
Energy expenditure
B
Motivation
C
Force and displacement
D
Time spent
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Q. 14
How do you calculate average power?
A
Total distance divided by time
B
Total work divided by total time
C
Total energy divided by total mass
D
Total time divided by total energy
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Q. 15
For an object to have gravitational potential energy only, it must be:
A
Accelerating
B
Moving
C
Falling
D
At an elevated position
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Q. 16
A freely falling body during its fall will have:
A
Kinetic energy
B
Potential energy
C
Sound energy
D
Both kinetic and potential energy
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Q. 17
What happens to the energy of an object that does work?
A
It transforms into heat
B
It loses energy
C
It gains energy
D
It remains unchanged
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Q. 18
How is the work done expressed when the angle between force and displacement is 180 degrees?
A
W = Fs²
B
W = Fs
C
W = F/s
D
W = -Fs
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Q. 19
What is the larger unit of power often used?
A
Joule
B
Kilowatt (kW)
C
Horsepower
D
Newton
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Q. 20
What is the work done when a retarding force acts on an object moving in the opposite direction?
A
Work is negative
B
Work is zero
C
Work is infinite
D
Work is positive
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Q. 21
In the case of negative work, the angle between the force and displacement is:
A
0°
B
90°
C
45°
D
180°
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Q. 22
How is energy measured in relation to work?
A
In liters
B
In meters
C
In joules
D
In grams
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Q. 23
Who is James Prescott Joule?
A
A British physicist
B
A mathematician
C
A famous chemist
D
A historian
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Q. 24
When a raised hammer falls and drives a nail into wood, what happens to the energy?
A
It is lost
B
It is created
C
It is transformed
D
It is transferred
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Q. 25
A boy holds a mass on his stretched hand. Then:
A
Work done against gravity is zero
B
Muscular energy is used
C
Both (a) and (b)
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Q. 26
What happens if you push a rock and it doesn't move?
A
No work is done
B
Partial work is done
C
Energy is conserved
D
Work is done
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Q. 27
A body at rest cannot have:
A
Potential energy
B
Kinetic energy
C
Electrical energy
D
Both A and B
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Q. 28
If 100 joules of work is done in 5 seconds, what is the power?
A
10 W
B
50 W
C
20 W
D
5 W
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Q. 29
Choose the correctly matched pair.
A
Work done when force is applied but no displacement occurs - Work is done
B
Work done when force is zero - Positive work
C
Work done when force and displacement are perpendicular - Maximum work
D
Work done when force and displacement are in opposite directions - Negative work
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Q. 30
Potential energy is energy possessed by an object due to its:
A
Motion
B
Speed
C
Position
D
None of these
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Q. 31
When you lift a book, what indicates that work is done?
A
The book is heavy
B
The book moves up
C
You feel tired
D
You use both hands
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Q. 32
A porter with a suitcase on his head is climbing up stairs. The work done by the suitcase’s weight is:
A
Negative
B
Undefined
C
Positive
D
Zero
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Q. 33
According to the law of conservation of energy, which statement is true?
A
Energy transformation always leads to a loss of energy
B
Only kinetic energy is conserved, not potential energy
C
The total energy before and after transformation remains the same.
D
Energy can be created and destroyed
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Q. 34
Two bodies of equal weight are kept at heights h and 1.5h. The ratio of their potential energies is:
A
2 : 3
B
1 : 1
C
3 : 2
D
4 : 3
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Q. 35
In the case of pushing a pebble, what confirms that work is done?
A
You are tired
B
The pebble is heavy
C
The pebble moves
D
You push it slowly
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Q. 36
What two types of energy make up mechanical energy?
A
Kinetic energy and chemical energy
B
Potential energy and kinetic energy
C
Potential energy and thermal energy
D
Light energy and chemical energy
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Q. 37
Why might Kamali feel exhausted despite not doing scientific work?
A
Inefficient study methods
B
Poor time management
C
Mental energy expenditure
D
Lack of motivation
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Q. 38
The work done by the gravitational force on the moon as it revolves around the earth is:
A
F⋅πr
B
Zero
C
F⋅2πr
D
Negative work
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Q. 39
Which of the following is not an example of potential energy?
A
A compressed spring
B
A stretched rubber band
C
Water stored in a reservoir
D
A moving car
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Q. 40
A flying aeroplane possesses
A
only potential energy
B
only kinetic energy
C
both potential and kinetic energy
D
neither potential nor kinetic energy
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Q. 41
1 J is the energy required to do ____ of work.
A
1 N
B
98 J
C
1 J
D
9.8 N
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Q. 42
If an object of mass 2 kg is raised to a height of 5 m, what is its potential energy?
A
10 J
B
50 J
C
20 J
D
100 J
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Q. 43
What happens to the potential energy of an object when it is raised to a greater height?
A
It decreases
B
It remains the same
C
It increases
D
It becomes kinetic energy
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Q. 44
A force of 10 N displaces a body by 6 m in 3 seconds. The power is
A
5 W
B
1.8 W
C
180 W
D
20 W
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Q. 45
Elastic potential energy of a body can be achieved by:
A
Using an elastic band
B
Setting it into motion
C
Compressing or stretching the body
D
Raising the body to a height
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Q. 46
Which of the following produces energy because of temperature differences at various levels in the ocean?
A
Solar energy
B
Wave energy
C
Tidal energy
D
Ocean thermal energy
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Q. 47
In the SI system, the unit of potential energy is:
A
Joule
B
Newton
C
Watt
D
Metre per second
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Q. 48
What is the term used in science to define work as the product of force and displacement?
A
Power
B
Motion
C
Work
D
Energy
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Q. 49
What is the unit of energy named after James Prescott Joule?
A
Newton
B
Joule (J)
C
Calorie
D
Watt
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Q. 50
In common parlance, what does 'working hard' imply?
A
Physical exhaustion
B
Mental effort
C
Energy expenditure
D
All of the above
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Q. 51
What is energy often defined as in scientific terms?
A
Capability to do work
B
Kinetic energy
C
Ability to move
D
Potential energy
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Q. 52
What does power measure?
A
Total energy
B
Mass of an object
C
Speed of light
D
Rate of doing work
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Q. 53
A body is acted upon by a force of 25 N acquires an acceleration of 5 m/s² and covers a distance in 2 sec. If the body starts from rest, the Kinetic energy acquired by it is?
A
75 J
B
25 J
C
250 J
D
100 J
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Q. 54
Which of the following is NOT a form of energy mentioned in the text?
A
Mechanical energy
B
Heat energy
C
Nuclear energy
D
Electrical energy
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Q. 55
On tripling the speed of motion of a body, the change in K.E. is:
A
8 times
B
9 times
C
4 times
D
2 times
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Q. 56
Newton-metre is the unit of:
A
Work
B
Power
C
Momentum
D
Gravitational intensity
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Q. 57
If the bulbs of 60 W and 40 W are connected in series to a 220 V source, the bulb that glows brighter is:
A
60 W bulb
B
40 W bulb
C
Both will glow equally bright
D
Depends on the maker of the bulb
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Q. 58
What is the unit of work?
A
Pascal
B
Joule (J)
C
Newton
D
Meter
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Q. 59
What does the law of conservation of energy state?
A
Energy can be destroyed
B
Energy cannot be transferred
C
Energy can only be transformed
D
Energy can be created
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Q. 60
Does standing still with a heavy load count as work scientifically?
A
No
B
Yes
C
Depends on the load
D
Sometimes
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Q. 61
What is the unit of energy in the International System of Units (SI)?
A
Joule (J)
B
Pascal
C
Watt
D
Newton
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Q. 62
What does a positive work indicate in terms of force and displacement?
A
Force acts perpendicular
B
Force acts in the same direction
C
Force acts opposite to displacement
D
No force applied
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Q. 63
What significant law did Joule verify experimentally?
A
Law of conservation of energy
B
Law of thermodynamics
C
Law of motion
D
Law of universal gravitation
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Q. 64
Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal:
A
Momentum
B
Acceleration
C
Kinetic energy
D
Potential energy
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Q. 65
What type of energy is gained when an object is raised to a height?
A
Thermal energy
B
Electrical energy
C
Gravitational potential energy
D
Kinetic energy
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Q. 66
If a force of 1 N displaces an object by 1 m, how much work is done?
A
1 J
B
1 N m
C
2 J
D
0 J
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Q. 67
A body of mass 44 kg is moving at a velocity of 10 m/s and is brought to rest in 10 mins; the work done is:
A
220 J
B
-2200 J
C
22 J
D
22000 J
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Q. 68
What is the mechanical equivalent of heat?
A
A form of kinetic energy
B
A type of potential energy
C
A conversion factor between heat and work
D
A measure of heat transfer
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Q. 69
What remains constant during the free fall of an object?
A
Potential energy only
B
Kinetic energy only
C
Total mechanical energy
D
None of the above
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Q. 70
What happens to the total energy of a system during energy transformation?
A
It remains unchanged
B
It decreases
C
It fluctuates
D
It increases
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Q. 71
How does the scientific definition of work differ from common understanding?
A
Focus on mental effort
B
Focus on movement
C
Focus on physical appearance
D
Focus on time spent
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Q. 72
Which activity is considered to involve scientific work?
A
Reading books
B
Climbing stairs
C
Watching TV
D
Humming a tune
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Q. 73
A boy climbs onto a wall that is 3.4 m high and gains 2250 J of potential energy. What is the mass of the boy? Take g = 9.8 m/s².
A
50 kg
B
70 kg
C
67.5 kg
D
62.5 kg
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Q. 74
How does the work done by gravity depend on the height?
A
It depends on the path taken
B
It depends on the speed of the object
C
It depends on the object’s weight
D
It depends on the height difference
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Q. 75
What is the work done against gravity when raising an object?
A
mg + h
B
mg × h
C
mgh²
D
mg - h
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Q. 76
The kinetic energy of a body changes from 12 J to 60 J due to the action of a force of 5N on an object of mass 4 kg. The work done by the force is:
A
24 J
B
60 J
C
48 J
D
36 J
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Q. 77
A fish with a weight of 35 kg dives and hits the ground (zero height) with kinetic energy equal to 3500 J. Find the height through which the fish dived. Take g = 10 m/s².
A
1 km
B
20 m
C
100 m
D
10 m
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Q. 78
Two masses m and 2m are dropped from a height h. On reaching the ground:
A
K.E. of the heavier is 4 times the K.E. of the lighter
B
K.E. of the lighter is 4 times the K.E. of the heavier
C
K.E. of them will be equal
D
K.E. of the heavier is more than that of the lighter
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Q. 79
If the velocity of a moving car is halved, its kinetic energy would:
A
Become Half
B
Become one fourth
C
Remain the same
D
Double
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Q. 80
What happens if a force is applied but there is no displacement?
A
Work is done
B
Work is not done
C
Work is negative
D
Work is infinite
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Q. 81
How fast should a person with mass 50 kg walk so that his kinetic energy is 625 J?
A
5 km/s
B
15 km/s
C
0.5 m/s
D
5 m/s
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Q. 82
What is the formula for kinetic energy?
A
KE = mv
B
KE = Fd
C
KE = mgh
D
KE = 1/2 mv²
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Q. 83
When a baby pulls a toy car with a constant force in the same direction as its movement, how is the work classified?
A
Zero work
B
Negative work
C
No work
D
Positive work
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Q. 84
In which case is the maximum work done when moving a body through a distance of 3 m?
A
When pushed over an inclined plane
B
When lifted vertically upward
C
When pushed over smooth rollers
D
When pushed on a plain horizontal surface
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Q. 85
In which scenario is the work done considered positive?
A
Force opposite to displacement
B
Force parallel to displacement
C
Force perpendicular to displacement
D
No force applied
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Q. 86
If the speed of an object doubles, its kinetic energy becomes:
A
Double
B
Half
C
Four times
D
One-fourth
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Q. 87
What is the primary source of energy for us?
A
The Moon
B
Wind
C
The Sun
D
Fossil fuels
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Q. 88
What happens to work done when the force is zero?
A
Work is infinite
B
Work is negative
C
Work is zero
D
Work is positive
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Q. 89
A mass ‘m’ falls from a height ‘h’. At any point in its path, the total energy is:
A
mgh/4
B
Depends on the height
C
mgh
D
mgh/2
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Q. 90
A body of mass 4 kg has a momentum of 25 kg m/s, its K.E. is:
A
25.5 J
B
78.12 J
C
70.66 J
D
100 J
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Q. 91
What is the unit of power named after?
A
Albert Einstein
B
Isaac Newton
C
James Watt
D
Nikola Tesla
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Q. 92
If a girl pulls a trolley and it doesn't move, is work done?
A
Yes
B
No
C
Partially
D
Depends on the force applied
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Q. 93
If 1 newton of force displaces a body by 1 m, the work done is
A
1 joule
B
5 joule
C
10 joule
D
Depends on time
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Q. 94
What are the two conditions necessary for work to be done scientifically?
A
Energy expenditure and time
B
Mass and force
C
Force applied and displacement
D
Distance moved and speed
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