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42. Two discs of the same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio

(a)  1 :  81

(b)  1 : 27

(c)   1 :  9

(d)  1 :  3

Ans. a

(9)

5/5 - (1 vote)

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