Question

Choose the correct statements about 'Forced vibration':

• A. There is a presence of external periodic force.
  
• B. The frequency of vibration is equal to the frequency of the applied force.
  
• C. The amplitude of vibration does not depend on the frequency of the applied force.
  
• D. The frequency of vibration changes with a change in the frequency of the applied force.

Answer 1

Answer: (A), (B), (D)

The correct options are
A

There is a presence of external periodic force.

B

The frequency of vibration is equal to the frequency of the applied force.

D

The frequency of vibration changes with a change in the frequency of the applied force.

The vibrations of a body which take place under the influence of an external periodic force acting on it, are called the 'Forced vibrations'.

For a body under forced vibration, its frequency of vibration depends on the frequency of the applied force. And it gradually acquires the frequency of the applied force. In other words, the frequency of vibration changes with a change in the frequency of the applied force. So, options(A),(B) and (D) are correct.