Power and Energy NDA Questions

NDA Physics

Power and Energy MCQ Questions


7.
An object is dropped from a certain height As it falls, its kinetic energy
A.
Varies randomly
B.
Stays constant
C.
Increases
D.
Decreases
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ANSWER :
C. Increases
8.
The relationship between power and work done is given by
A.
Power = Work ÷ Time
B.
Power = Work × Time
C.
Power = Work ÷ Distance
D.
Power = Distance ÷ Work
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ANSWER :
A. Power = Work ÷ Time
9.
A hydroelectric plant generates electricity by converting
A.
Potential energy to electrical energy
B.
Kinetic energy to electrical energy
C.
Chemical energy to electrical energy
D.
Both a) and b)
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ANSWER :
D. Both a) and b)
10.
A pendulum has maximum potential energy at
A.
The lowest point in its swing
B.
The highest point in its swing
C.
Halfway through its swing
D.
Throughout the swing
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ANSWER :
B. The highest point in its swing
11.
If a machine does work at a constant rate, then its power
A.
Fluctuates
B.
Decreases over time
C.
Increases over time
D.
Remains constant
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ANSWER :
D. Remains constant
12.
An object has a potential energy of 500 J before it is released What happens to its energy as it falls?
A.
It remains as potential energy
B.
It is converted to power
C.
It is converted to kinetic energy
D.
It is destroyed
😑 View Answer Rough Work Error
ANSWER :
C. It is converted to kinetic energy