Assertion :Motion of a ball bouncing elastically in vertical direction on a smooth horizontal floor is a periodic motion, but not an SHM. Reason: Motion is SHM when restoring force is proportional to displacement from mean position.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Motion of a ball bouncing elastically in vertical direction on a smooth horizontal floor is a periodic motion, because it will keep bouncing with a fixed time interval. But it is not a SHM because there is no restoring force which is proportional to the displacement from the mean position. there is a force $m g$ which is constant. Hence both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

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