NEET Physics Free Damped Forced Oscillations and Resonance MCQs Set A

Question. In case of a forced vibration, the resonance wave becomes very sharp when the
(a) damping force is small
(b) restoring force is small
(c) quality factor is small
(d) applied periodic force is small

Answer: A

Question. What is the amplitude of simple harmonic motion at resonance in the ideal case of zero damping?
(a) Infinite
(b) 1
(c) – 1
(d) Zero

Answer: A

Question.  In case of sustained forced oscillations the amplitude ofN oscillations
(a) decreases linearly
(b) decreases sinusoidally
(c) decreases exponentially
(d) always remains constant

Answer: A

Question. The frequency of the simple harmonic motion attained in forced oscillations, after the forced oscillation die out, is
(a) the frequency of the driving force
(b) double the frequency of the driving force
(c) double the natural frequency of the particle
(d) the natural frequency of the particle

Answer: A

Question. Choose the false statement(s) for a forced oscillation.
I. Displacement amplitude of an oscillator is independent of the angular frequency of the driving force.
II. The amplitude tends to infinity when the driving frequency equals the natural frequency.
III. Maximum possible amplitude for a given driving frequency is governed by the driving frequency and the damping
(a) I only
(b) I and II
(c) II only
(d) I, II and III

Answer: A

Question. Assertion: Amplitude of a forced vibration can never reach infinity.
Reason: The driving frequency cannot be increased beyond a certain limit.
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct.
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A