A field in which the work done in a moving a body along closed path is zero is called________________?
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A. electric field
B. conservative field
C. electromagnetic field
D. gravitational field
Physics MCQ's
The average power and instantaneous power become equal if work is done at __________________?
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A. any rate
B. at variable rate
C. at uniform rate
D. at high rate
If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
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A. 38.2 J
B. 392.1 J
C. 39.2 J
D. 3.92 J
Work done on the body equals to the _____________________?
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A. change in its K.E always
B. change in its P.E always
C. change in its K.E and change in its P.E
D. neither change in K.E and nor change in its P.E
A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
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A. The extension of the wire is proportional to the force applied
B. The weight of the wire is negligible
C. The wire is not stretched beyond its elastic limit
D. The cross sectional area of the wire remains constant
The dimension of force is____________________?
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A. MLT-2
B. ML2T-2
C. ML2T2
D. ML-2T-2
Propulsion force of a rocket is____________________?
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A. non-conservative force
B. conservative force
C. both A and B
D. none of these
Work done by variable force is determined by dividing____________________?
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A. force into small interval
B. displacement into small interval
C. both force and displacement into small intervals
D. force into small and displacement into large intervals
When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
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A. zero
B. minimum
C. infinity
D. maximum