Answer the second question

When the body moves in a circular path with uniform speed, it is called uniform circular motion. 
It is possible for a body to move in a circular path with uniform speed as long as it is traveling equal distances in equal interval of time, but the velocity cannot be uniform since the direction of motion is continually changing.

Hence due to the change in velocity, the motion is an accelerated motion, circular accelerated motion. Though, the speed may not change but direction will change.