Assertion: On a banked curved track, vertical component of normal reaction provides the necessary centripetal force. Reason : Centripetal force is not always required for turning.

• A

  If both assertion and reason are true and reason is the correct explanation of assertion.
• B

  If both assertion and reason are true but reason is not the correct explanation of assertion.
• C

  If assertion is true but reason is false.
• Correct answer
  D

  If both assertion and reason are false.

Hence, the correct answer is option: 'D'.