Which of the following bodies of same mass and same radius has minimum moment of inertia?

The following bodies have same mass and radius. The body with large moment of inertia about geometric axis is

Two lenses, one convex and other concave, are of same mass and same radius. Which will have greater moment of inertia?

Two lenses one convex and one concave are of same mass and same radius. Which will have greater moment of inertia about its pole?

Which of the following molecule has same dipole moment :-

A ring and a disc have same mass and same radius. Then ratio of moment of inertia of ring to the moment of inertia of disc is

A ring and a disc have same mass and same radius. Then ratio of moment of inertia of ring to the moment of inertia of disc is

A circular ring and a disc have same mass and radius. Which has larger moment of inertia?