Oscillations Te...

Assertion Sine and cosine functions are periodic functions.
Reason Sinusoidal functions repeats it values after a definite interval of time.

Assertion Ocean waves hitting a beach are always found to be nearly normal to the shore.
Reason Ocean waves hitting a beach are assumed as plane waves.

Assertion When a simple pendulum is made to oscillate on the surface of moon, its time period increases.
Reason Moon is much smaller as compared to earth.

Assertion Resonance is special case of forced vibration in which the natural frequency of vibration of the body is the same as the impressed frequency of external periodic force and the amplitude of forced vibration is maximum.
Reason The amplitude of forced vibrations of a body increase with an increase in the frequency of the externally impressed periodic force.

Assertion The graph of total energy of a particle in S.H.M. w.r.t., position is a straight line with zero slope.
Reason Total energy of particle in S.H.M. remains constant throughout its motion.

Assertion Consider motion for a mass spring system under gravity, motion of M is not a simply harmonic motion unless Mg is negligibly small.
Reason For simple harmonic motion acceleration must be proportional to displacement and is directed towards the mean position.

Assertion In simple harmonic motion, the velocity is maximum when acceleration is minimum.
Reason Displacement and velocity of S.H.M. differ is phase by π/2.

Assertion Damped oscillation indicates loss of energy.
Reason The energy loss in damped oscillation may be due to friction, air resistance etc.

Assertion In a S.H.M., kinetic and potential energies become equal when the displacement is 1/√2 times the amplitude.
Reason In S.H.M. kinetic energy is zero when potential energy is maximum.

Assertion If the amplitude of a simple harmonic oscillator is doubled, its total energy becomes four times.
Reason The total energy is directly proportional to the square of amplitude of vibration of the harmonic oscillator.