Power NEET Questions

Physics - Work, Energy, and Power

Power MCQ Questions


1.
Power is defined as:
A.
Force multiplied by velocity
B.
Total work done in a process
C.
Rate at which work is done or energy is transferred
D.
Work done per unit displacement
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ANSWER :
C. Rate at which work is done or energy is transferred
2.
The average power of a force is defined as:
A.
P_av = F × t
B.
P_av = W/t (work done divided by total time)
C.
P_av = F × v at any instant
D.
P_av = ΔKE/Δs
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ANSWER :
B. P_av = W/t (work done divided by total time)
3.
Instantaneous power is defined as:
A.
W/t at any fixed instant
B.
F × v (dot product of force and velocity)
C.
The maximum power delivered
D.
Power when velocity is maximum
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ANSWER :
B. F × v (dot product of force and velocity)
4.
A pump is used to lift 500 kg of water from a depth of 80 meters in 10 minutes. The power required by the pump is (take g = 10 m/s²):

NEET - 2020

A.
500 W
B.
600 W
C.
700 W
D.
800 W
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ANSWER :
A. 500 W
5.
A force F acts on a body moving with velocity v. The instantaneous power is:
A.
P = F·v = Fv cosθ
B.
P = Fv sinθ
C.
P = F/v
D.
P = F + v
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ANSWER :
A. P = F·v = Fv cosθ
6.
The SI unit of power is:
A.
Watt (W) = 1 J s⁻¹
B.
Newton-metre (N·m)
C.
Joule (J)
D.
Erg per second
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ANSWER :
A. Watt (W) = 1 J s⁻¹