Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power

Conservation of Mechanical Energy MCQ Questions


7.
Which of the following conditions violate the principle of conservation of mechanical energy?
A.
Frictionless motion
B.
Presence of air resistance
C.
Only gravitational force acting
D.
Elastic collisions
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ANSWER :
B. Presence of air resistance
8.
A satellite in orbit around Earth has constant:
A.
Kinetic energy
B.
Potential energy
C.
Total mechanical energy
D.
Acceleration
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ANSWER :
C. Total mechanical energy
9.
A skier starts from rest at the top of a frictionless hill of height H. What is the skier’s speed at the bottom?
A.
√(2gH)
B.
gH
C.
H/2
D.
g/H
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ANSWER :
A. √(2gH)
10.
The potential energy of a mass attached to a spring is given by (1/2)kx². What happens to the total mechanical energy in the absence of friction?
A.
It remains constant
B.
It decreases
C.
It increases
D.
It fluctuates
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ANSWER :
A. It remains constant
11.
If an object falls freely under gravity, which of the following statements is correct?
A.
Only kinetic energy increases
B.
Only potential energy decreases
C.
Mechanical energy is conserved
D.
Mechanical energy is lost
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ANSWER :
C. Mechanical energy is conserved
12.
A stone is thrown vertically upwards with initial speed u. What is the speed when it returns to the same height?
A.
u
B.
2u
C.
√u
D.
Zero
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ANSWER :
A. u