A body is in rotational motion. Is it necessary that a torque be acting on it ?

A body is set into rotational motion due to

A rigid body is rotating about a vertical axis at n rotations per minute, If the axis slowly becomes horizontal in t seconds and the body keeps on rotating at n rotations per minute then the torque acting on the body will be, if the moment of inertia of the body about axis of rotation is I.

Rotational Motion - Torque

Rigid Body|Rotational Motion

If the resultant torque of all the forces acting on a body is zero about a point is it necessary that it will be zero about any other point?

A : For a body to be in rotational equilibrium the net torque acting on the body about any point is zero. R : For net torque to be zero, net force should also be zero.

A body is in pure rolling on a surface. Is it necessarily being acted upon by an external torque ?

If a body is rotating, is it necessarily being acted upon by an external torque ?

A rigid body is rotating about a vertical axis. In t second, the axis gradually becomes horizontal. But the rigid body continues to make v rotations per second throughout the time interval of 1 second. If the moment of inertia I of the body about the axis of rotation can he taken as constant, then the torque acting on the body is

A body in circular motion is acted upon by