When a disc rotates with uniform angular velocity, which of the following is not true ?

Options

A. The sense of rotation remains same
B. The orientation of the axis of rotation remain same
C. The speed of rotation is non-zero and remains same
D. The angular acceleration is non-zero and remains same

Answer

D

Explanation

We know that angular acceleration
`alpha=(d omega)/(dt)`,
where `omega` is angular velocity of the disc
given `omega=` constant
`rArr alpha=(d omega)/(dt)=(0)/(dt)=0`
Hence, angular acceleration is zero.