List of top Physics Questions on Waves and Oscillations asked in CUET (UG)

A pendulum completes 20 oscillations in 40 seconds. What is its frequency?
Two sitar stings A and B playing a note are slightly out of tune and produces beats of frequency 5 Hz. The tension in string B is slightly increased and beat frequency become 3 Hz. What is the original frequency of B if frequency of A is 427 Hz.