Question

# Which of the following statements is not correct about periodic and oscillatory motion?

A

If the motion repeats itself after a certain fixed interval of time, it is called periodic motion.

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B

The to and fro motion of a body about a fixed point is called oscillatory motion.

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C

All periodic motions can be called oscillatory motions.

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D

All oscillatory motions can be called periodic motions.

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Solution

## The correct option is C All periodic motions can be called oscillatory motions. Oscillatory motion: A to and fro or back and forth motion of a body about its mean position in a fixed interval of time. For example, the motion of a pendulum. Periodic motion: Any motion that repeats itself at regular interval of time. For example, the motion of planets around the Sun, the motion of a pendulum. All oscillatory motions are periodic but NOT all periodic motions are oscillatory. For example, the motion of a planet around the Sun is periodic but not oscillatory.

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