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When a body moves in a circular path undergoing uniform circular motion no work is done during half a circular motion since

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there is no net force acting on body

there is no displacement of the body

force and displacement are always perpendicular to each other

Given statement is wrong. Work done during a complete circular motion is zero but some work is done during half a circular motion

answer is C.

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Detailed Solution

When a body moves in a circular path, then centripetal force is always directed towards centre of circular path. Hence, centripetal force and displacement (directed tangentially) are perpendicular to each other.

$∴$ Work done W = F s cos $90^{0}$ = 0

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