Can a moving object have a constant speed but a changing velocity?

$A$ particle is moving with constant speed in a circular path. When the particle turns by an angle $90^{\circ}$,the ratio of instantaneous velocity to its average velocity is $\pi : x \sqrt{2}$. The value of $x$ will be $.........$

For a particle moving in a circular path with constant speed,which component of its linear acceleration is constant and which component is not constant?

As shown in the figure,a particle is moving with a constant speed $v = \pi \, m/s$ in a circular path. Considering its motion from point $A$ to point $B$,where the angle subtended at the center is $120^{\circ}$,the magnitude of the average velocity is:

In uniform circular motion,

The angular velocity of a particle rotating in a circular orbit $100$ times per minute is