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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘m’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period

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Correct option: B

Decreases initially and increases again

Option B (Decreases initially and increases again) is correct because the angular velocity decreases as the fluid spreads, increasing the moment of inertia, and then increases again as the fluid falls off, decreasing the moment of inertia.

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