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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Assertion: A sphere cannot roll on a smooth inclined surface.
Reason: The motion of a rigid body which is pivoted or fixed in some way is rotation.

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Correct option: B

If both assertion and reason are true but reason is not the correct explanation of assertion

Option B is correct because the assertion and reason are both true, but the reason does not explain the assertion. A sphere cannot roll on a smooth surface because there's no friction to provide torque, and the reason correctly states the nature of rotational motion.

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\left( {rad\,{s^{ - 2}}} \right)