The periodic vibrations of a body of constant amplitude in the absence of any external force on it are called

Forced vibrations

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Free vibration

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Damped vibrations

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All

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Solution

The correct option is B Free vibration
Forced vibrations: External force is acting on the body.
Free vibration: Constant amplitude and no external force.
Damped vibration: Amplitude is not constant, it keeps on decreasing due to environmental factors of the system like air resistance.
Therefore, correct option is B.

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The periodic vibrations of a body in the absence of any external force is called:

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