Discussion
When the body vibrates under the influence of external force, then body is said under :
Answer: C
The body is under forced vibration.
Forced vibration is vibration maintained by an external periodic force, and the body vibrates at the frequency of that force. Resonance, the large amplitude when the forcing frequency equals the natural frequency, is a feature of forced vibration.
Natural (free) vibration takes place with no external force once the body has been disturbed, at its own natural frequency; 'tree vibration' in the options is evidently a misprint for free vibration. Damped vibration describes vibration whose amplitude dies away because of resistance, whether free or forced.
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