1 Mark Question
Answer : Yes, the velocity of a particle in a uniform circular motion is variable or the circular motion is accelerated even though the speed of particle is uniform.
3 Marks Questions
Answer : With reference to their direction of action, centripetal force is directed towards the centre of circle whereas centrifugal force is opposite to centripetal force (i.e., radially outward).
Answer : i) Speed remains constant in uniform circular motion.
ii) Centripetal force is required for uniform circular motion.
Centripetal force is directed towards the centre.