Power NEET Questions

Physics - Work, Energy, and Power

Power MCQ Questions


13.
The rate of change of kinetic energy is equal to:
A.
Work done
B.
Power
C.
Force
D.
Momentum
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ANSWER :
B. Power
14.
A vehicle is moving in a circular path of radius r with speed v. The power required to maintain uniform circular motion is proportional to:
A.
v3
B.
v2
C.
v
D.
v4
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ANSWER :
A. v3
15.
If a particle moves in a circular path with constant speed, its power:
A.
Remains constant
B.
Increases
C.
Decreases
D.
Is zero
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ANSWER :
D. Is zero
16.
A machine supplies constant power to a body. The displacement is proportional to:
A.
t
B.
t2
C.
t3
D.
t4
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ANSWER :
C. t3
17.
A body of mass 1 kg begins to move under the action of a time-dependent force F = (2t î + 3t² ĵ) N, where î and ĵ are unit vectors along the x and y axes. What power will be developed by the force at time t?

NEET - 2016

A.
(2t² + 3t³) W
B.
(2t³ + 3t⁴) W
C.
(t² + t³) W
D.
(2t² + 3t⁴) W
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ANSWER :
A. (2t² + 3t³) W
18.
Power is said to be negative when:
A.
Force is opposite to velocity
B.
Force and velocity are in same direction
C.
No work is done
D.
Speed is zero
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ANSWER :
A. Force is opposite to velocity