In the case of uniform circular motion,which of the following physical quantities does not remain constant?

$A$ body performing uniform circular motion of radius $R$ has frequency $n$. Its centripetal acceleration is

If the angular velocity of a merry-go-round is $60^o/s$ and you are $3.5\,m$ from the centre of rotation,your linear velocity will be

Assertion $(A)$: The speed of a body in uniform circular motion is constant.
Reason $(R)$: In uniform circular motion,the acceleration of the body is constant.

The angular speed of Earth around its own axis is ......... $rad/s$.

In Uniform Circular Motion ($U$.$C$.$M$.),when the time interval $\delta t \rightarrow 0$,the angle between the change in velocity $(\delta v)$ and the linear velocity $(v)$ will be (in $^{\circ}$)