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The axis \( \mathrm{X} \) and \( \mathrm{Z} \) in the plane of a disc are mutually perpendicular and \( \mathrm{Y} \)-axis is perpendicular to the plane of the disc. If the moment of inertia of the body about \( \mathrm{X} \) and \( \mathrm{Y} \) axes is respectively \( 30 \mathrm{~kg} \) \( \mathrm{m}^{2} \) and \( 40 \mathrm{~kg} \mathrm{~m}^{2} \) then M.I. about Z-axis in \( \mathrm{kg} \) \( \mathrm{m}^{2} \) will be :-
(1) 70
(2) 50
(3) 10
(4) Zero
(W)
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