Power NEET Questions

Physics - Work, Energy, and Power

Power MCQ Questions


7.
A particle moves under a force F=-kx. The power at any instant is:
A.
Zero
B.
Positive
C.
Negative
D.
Cannot be determined
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ANSWER :
C. Negative
8.
A pump lifts 200 kg of water per minute to a height of 10 m. The power of the pump is:
A.
400 W
B.
500 W
C.
600 W
D.
700 W
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ANSWER :
B. 500 W
9.
The unit of power in CGS system is:
A.
Joule
B.
Erg/s
C.
Watt
D.
Calorie
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ANSWER :
B. Erg/s
10.
A cyclist is moving at 5 m/s and increases his speed to 10 m/s in 10 seconds. If the force exerted is 200 N, the power developed is:
A.
500 W
B.
1000 W
C.
1500 W
D.
2000 W
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ANSWER :
B. 1000 W
11.
An electric motor lifts a 75 kg mass vertically at a constant speed of 0.5 m/s. The power output of the motor is (take g = 10 m/sĀ²):

NEET - 2019

A.
250 W
B.
375 W
C.
500 W
D.
750 W
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ANSWER :
B. 375 W
12.
A force F = 10t N acts on a body moving along a straight line. If its velocity at t = 0 is 5 m/s, the instantaneous power at t = 2s is:
A.
100 W
B.
50 W
C.
200 W
D.
150 W
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ANSWER :
C. 200 W