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Consider a planet moving in an elliptica...

Consider a planet moving in an elliptical orbit around the Sun. The work done on the planet by the gravitational force of the Sun

A

is zero in any small part of the orbit

B

is zero in some parts of the orbit

C

is zero in complete revolution

D

is zero in no part of the motion

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The correct Answer is:
B, C
When a planet is on the major axis of the orbit, gravitational force on the planet is nomal to its motion. So, no work is done. As that energy remains the same, no work is done in complete revolution.
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