Question

Statement I: Centripetal acceleration is always directed towards the centre of rotation of an object undergoing uniform circular motion.
Statement II:For uniform circular motion centripetal acceleration is a constant vector.

• A. If both statement I and statement II are true and statement II is the correct explanation of statement I.
• B. If both statement I and statement II are true but statement II is not the correct explanation of statement I.
• C. If statement I is true but statement II is false.
• D. If both statement I and statement II are false.

Answer 1

Answer: (C)

Centripetal acceleration $=\frac{v^{2}}{R}$
For uniform circular motion, $v$ and $R$ are constant, the magnitude of the centripetal acceleration is constant. But the direction changes-pointing always towards the centre. Therefore, a centripetal acceleration is not a constant vector.