Question

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

• A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion
• B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
• C. If Assertion is true but the Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (C)

If Assertion is true but the Reason is false

Answer 2

Resonance occurs when the frequency of the applied force becomes nearly equal to the natural frequency of vibration of the body. During resonance the amplitude of the forced vibration reaches its maximum value. So, if we increase the frequency of the externally impressed periodic force, the amplitude of the forced vibration does not increase but it decreases. So the given reason is false.