Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power

Work-Energy Theorem MCQ Questions


1.
The work-energy theorem states that:
A.
Total energy of a body is always constant
B.
Change in kinetic energy of a body equals the work done on it by the net force
C.
Work done by a force equals force times time
D.
KE equals work done only when body starts from rest
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ANSWER :
B. Change in kinetic energy of a body equals the work done on it by the net force
2.
Mathematically, the work-energy theorem is expressed as:
A.
Kf + Ki = W_net
B.
Kf − Ki = W_net
C.
W_net = ½mv²
D.
ΔK = −W_net
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ANSWER :
B. Kf − Ki = W_net
3.
A body of mass 1 kg is moving with a velocity of 10 m/s. A constant force acts on it for 4 seconds, increasing its velocity to 20 m/s. The work done by the force over this period is:

NEET - 2015

A.
100 J
B.
150 J
C.
200 J
D.
250 J
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ANSWER :
C. 200 J
4.
The work-energy theorem for constant force is derived from:
A.
Conservation of momentum
B.
Newton's Second Law (F = ma) combined with kinematics (v² − u² = 2as)
C.
Conservation of energy
D.
Newton's Third Law
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ANSWER :
A. Conservation of momentum
5.
For 3-dimensional motion under constant force, the work-energy theorem is obtained by:
A.
Using conservation of momentum in 3D
B.
Using v² − u² = 2a·d (vector form), then multiplying by m/2 to get F·d = ΔKE
C.
Using v² − u² = 2as in x-direction only
D.
Integrating Newton's 2nd Law over time
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ANSWER :
A. Using conservation of momentum in 3D
6.
The work-energy theorem is related to Newton's Second Law in that:
A.
They are completely independent principles
B.
WE theorem is the vector form of Newton's 2nd Law
C.
WE theorem is the scalar (integral) form of Newton's 2nd Law — temporal information is integrated over
D.
WE theorem is more general than Newton's 2nd Law
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ANSWER :
C. WE theorem is the scalar (integral) form of Newton's 2nd Law — temporal information is integrated over