Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power

Work-Energy Theorem MCQ Questions


7.
The work done by a force is equal to the change in kinetic energy of the object. This is valid for:
A.
Constant force only
B.
Variable force only
C.
Conservative forces only
D.
All forces
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ANSWER :
D. All forces
8.
A car of mass 1000 kg is moving at a speed of 20 m/s. If a braking force of 5000 N is applied, what distance will the car take to stop?
A.
40 m
B.
80 m
C.
20 m
D.
60 m
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ANSWER :
A. 40 m
9.
A particle moves under the influence of a force F = -kx. Starting from rest, its displacement as a function of time is best described by:

NEET - 2018

A.
Linear increase
B.
Parabolic increase
C.
Simple harmonic motion
D.
Exponential increase
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ANSWER :
C. Simple harmonic motion
10.
A force of 10 N is applied on a 2 kg object, causing its speed to increase from 5 m/s to 10 m/s. What is the work done by the force?
A.
50 J
B.
75 J
C.
100 J
D.
125 J
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ANSWER :
C. 100 J
11.
Which of the following statements about the work-energy theorem is correct?
A.
Work done by all forces is always equal to the change in kinetic energy
B.
Work done by the net external force is equal to the change in kinetic energy
C.
Work done by conservative forces is equal to the change in potential energy
D.
Work done by friction is always positive
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ANSWER :
B. Work done by the net external force is equal to the change in kinetic energy
12.
A force of 20 N acts on a 4 kg mass moving with a speed of 2 m/s over a distance of 5 m. The final speed of the mass is:
A.
5 m/s
B.
7 m/s
C.
9 m/s
D.
11 m/s
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ANSWER :
B. 7 m/s