List of top Physics Questions on simple harmonic motion asked in BHU UET

Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by $1\%, 3$ beats are produced in $2\,s$ . The initial frequency of vibration of each wire is:

The motion of a particle varies with time according to the relation $ y=a(\sin \omega t+\cos \omega t) $