In this question, a statement of assertion 
is followed by a statement of reason 
. Mark the correct choice as:
Assertion: If earth shrink to half its present size, length of the day would become 6 hours.
Reason: As size of the earth changes its moment of inertia changes.
Text Solution
Verified by ExpertsThe correct answer is:
A
: According to principle of conservation of angular momentum. 
constant.
constant or 
constant.
[Where 
is radius of gyration and 
]
When 
becomes 
becomes 
. Therefore, 
becomes 
of initial value i.e. 
.
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