System of Particles and Rotational Motion Questions

The moment of inertia of a uniform circular disc of radius $R$ and mass $M$ about an axis touching the disc at its diameter and normal to the disc is:

A tube of length $L$ is filled completely with an incompressible liquid of mass $M$ and closed at both ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity $\omega$. The force exerted by the liquid at the other end is:

A uniform rod of length $l$ and mass $M$ is free to rotate in a vertical plane about A. The rod initially in the horizontal position is released. The initial angular acceleration of the rod is: (Moment of inertia of the rod about A is $\frac{M{l}^2}{3}$)