Assertion :If the ice on the polar caps of the earth melts, then length of day will increase. Reason: Moment of inertia of the earth increases, as ice on polar caps melts.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Since the ice is accumulated on the poles, the distance of this mass of ice from the axis of rotation is less. When it melts to form water, water would spread in entire ocean, even in places far off from the axis of rotation, and hence the moment of inertia would increase.
This increase in moment of inertia would increase the length of the day.

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