Assertion :When a gas is compressed adiabatically it becomes more elastic.
Reason: An increase of pressure makes the medium more elastic.

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
When the pressure increases, the bulk modulus( $γ P$ ) increases and the gas become more elastic.

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