Assertion :Strain causes the stress in an elastic body Reason: An elastic rubber is more plastic in body.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$A n s w e r : -$ B option
$Y o u n g^{'} s m o d u l u s (Y) = \frac{s t r e s s}{s t r a i n}$
If strain changes stress also changes since $Y$ is constant for a material.
Also, $p o i s s o n^{'} s r a t i o (ν) = \frac{l a t e r a l s t r a i n}{l o n g i t u d i n a l s t r a i n}$
$ν = 0.5$ for rubber and is most elastic material.
So, both are correct but not reason of assertion.

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