The adjoining figure shows a disc of mass M and radius R lying in the X-Y plane with its centre on X-axis at a distance α from the origin. Then the moment of inertia of the disc about the X-axis is
(a) M(R2/2)
(b) M(R2/4)
(c) M(R2/4+a2)
(d) M(R2/2+a2)
Ans.b
(36)