List of top Physics Questions on System of Particles & Rotational Motion asked in UPSEE

Four balls each of radius $ 10\, cm $ and mass $ 1\, kg, 2\, kg, 3\, kg $ and $ 4 \,kg $ are attached to the periphery of massless plate of radius $ 1\,m $ .

What is moment of inertia of the system about the centre of plate ?

A thin wire of mass $ M $ and length $ L $ is bent to form a circular ring. The moment of inertia of this ring about its axis is