A) If both the assertion and reason are true and reason explains the assertion.
B) If both the assertion and reason are true but reason does not explain the assertion.
C) If assertion is true but reason is false.
D) If assertion is false but reason is true.
Correct Answer: A
Solution :
When the ice on the polar caps melts, the mass concentrated near the axis of rotation is spread out. The moment of inertia of system increases. Since, no external torque acts on the system. \[l\omega =\] constant. Therefore, if \[l\] increases, the angular speed will decrease. So. the time period of rotation of the earth \[\left( T=\frac{2\pi }{\omega } \right)\] increases i.e., the duration of the day will increase.
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