A solid disc is recast into a thin walled cylinder of same radus. Which will have larger moment of inertia ?

A disc is recast into a thin walled cylinder of same radius. Which will have large moment of inertia?

A disc is recast into hollow and thin cylinder of same radius, which will have larger moment of inertia.

An iron disc and a wooden disc have the same radius. Then which will have larger moment of inertia about the diameter ?

An iron disc and a wooden disc have the same radius. Then which will have larger moment of inertia about the diameter ?

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

Two discs A and B have same mass and same thickness but A is made of aluminium and B is made of lead. Which has larger moment of inertia about the central axis?