Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power

Conservation of Mechanical Energy MCQ Questions


1.
A ball of mass m is dropped from a height h. Assuming no air resistance, what will be its speed just before hitting the ground?
A.
√(2gh)
B.
gh
C.
2gh
D.
√(gh)
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ANSWER :
A. √(2gh)
2.
Which of the following is true about the conservation of mechanical energy?
A.
It holds only in the presence of non-conservative forces.
B.
It holds only for moving bodies.
C.
It is valid when only conservative forces act.
D.
It is valid for all types of forces.
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ANSWER :
C. It is valid when only conservative forces act.
3.
A pendulum bob of mass m is released from height H. What will be the velocity of the bob at the lowest point of its motion?
A.
√(2gH)
B.
gH
C.
2gH
D.
H/2
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ANSWER :
A. √(2gH)
4.
A block slides down a frictionless incline of height H. What is the speed of the block when it reaches the bottom?
A.
√(2gH)
B.
gH
C.
2gH
D.
√(H/g)
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ANSWER :
A. √(2gH)
5.
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
6.
In a system where only conservative forces act, the sum of kinetic energy and potential energy is:
A.
Always decreasing
B.
Always increasing
C.
Constant
D.
Zero
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ANSWER :
C. Constant