Physics
Grade-9
Easy
Question
Read the following statements and choose the correct option:
Assertion: All oscillatory motions are necessarily periodic motions, but all periodic motions are not oscillatory.
Reason: Simple pendulum is an example of oscillatory motion.
- The assertion is wrong, but the reason is right.
- The assertion and the reason are right, and the reason is the correct explanation of the assertion.
- The assertion and the reason both are wrong.
- Both assertion and reason are right, but the reason is not the correct explanation of the assertion.
Hint:
Oscillatory motion is the type of motion in which an object moves to and fro about a fixed point.
The correct answer is: Both assertion and reason are right, but the reason is not the correct explanation of the assertion.
Every oscillatory motion is periodic, because it repeats itself after regular intervals of time about mean position. But every periodic motion is not oscillatory. For example the earth rotates around the sun, but it is not to and fro motion about mean position.
Oscillatory motion is the type of motion in which an object moves to and fro about a fixed point. The swinging of a pendulum is an example of oscillatory motion.
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