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
(19)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)