$(a)$ Define uniform circular motion.
$(b)$ Is the uniform circular motion an accelerated motion? Give reasons for your answer.

(N/A) Uniform circular motion is defined as the motion of an object traveling along a circular path at a constant speed.
$(b)$ Yes,uniform circular motion is an accelerated motion. Even though the speed of the object remains constant,the direction of its velocity changes continuously at every point along the circular path. Since acceleration is defined as the rate of change of velocity,and velocity is a vector quantity (having both magnitude and direction),the continuous change in direction results in a continuous change in velocity,thereby causing acceleration.