Physics - Rotation Question with Solution | TestHub

MI of disk of radius$a$about given axis is$m{a}^2/2$

MI of ring of radius$a$about given axis is$m{a}^2$

MI of square of side$2a$about given axis is$m{\left(2a\right)}^2/6=2m{a}^2/3$

MI of four rods forming square of side$2a$about given axis is$4\times m{\left(2a\right)}^2/12+m{a}^2=4m{a}^2/3$

So among all options four rods forming square of side$2a$has highest moment of inertia of$4m{a}^2/3$about an axis passing through its center of mass and perpendicular to the plane of body.