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NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES

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Assertion A Moment of inertia of a circular disc of mass

M

and radius

R

about

X,\,Y -

axes (passing
through its plane) and

Z -

axis which is perpendicular to its plane were found to be

{l_x}\,\,,\,\,\,{l_y}

and

{l_z}

respectively. The respective radii of gyration about all the three axes will be the same.
Reason R A rigid body making rotational motion has fixed mass and shape.
In the light of the above statements, choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: D

A is not correct but R is correct.

Option D (A is not correct but R is correct) is correct because the radii of gyration about different axes of a circular disc are not the same, but the statement about a rigid body having fixed mass and shape is correct.

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