In this question, a statement of assertion is followed by …

Physics System of Particles Rotational Motion Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

Assertion: The spin angular velocity of a star is greatly enhanced when it collapse under gravitational pull and become a neutron star.
Reason: According to law of conservation of angular momentum there is increase in angular velocity of collapsing star.

If both assertion and reason are true and reason is the correct explanation of assertion.

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

If assertion is true but reason is false.

If assertion is false but reason is true.

Text Solution

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The correct answer is:

: On collapsing under gravitational pull, size of star decreases. Therefore, its moment of inertia

decreases. As angular momentum ( ) is conserved, and decreases, therefore, spin angular velocity increases.

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