Power NEET Questions

Physics - Work, Energy, and Power

Power MCQ Questions


7.
The dimensional formula of power is:
A.
[ML²T⁻²]
B.
[MLT⁻²]
C.
[ML²T⁻³]
D.
[ML³T⁻³]
😑 View Answer Rough Work Error
ANSWER :
C. [ML²T⁻³]
8.
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/s²):

NEET - 2019

A.
250 W
B.
375 W
C.
500 W
D.
750 W
😑 View Answer Rough Work Error
ANSWER :
B. 375 W
9.
One horse-power (hp) is equal to:
A.
1000 W
B.
550 W
C.
746 W
D.
373 W
😑 View Answer Rough Work Error
ANSWER :
C. 746 W
10.
Power is a:
A.
Vector quantity, direction same as force
B.
Vector quantity, direction same as velocity
C.
Scalar quantity that can be positive, negative, or zero
D.
Scalar quantity, always positive
😑 View Answer Rough Work Error
ANSWER :
C. Scalar quantity that can be positive, negative, or zero
11.
A man does 1500 J of work in 30 s. His average power is:
A.
50 W
B.
45000 W
C.
0.02 W
D.
500 W
😑 View Answer Rough Work Error
ANSWER :
A. 50 W
12.
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
😑 View Answer Rough Work Error
ANSWER :
A. (2t² + 3t³) W