Assertion :The stress-strain relationship in elastic region need not be linear and can be non-linear. Reason: Steel has non linear,profile in elastic zone.

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 C Assertion is correct but Reason is incorrect
$A$ is the elastic limit.
From Hook's law,we can say that within elastic limit stress is linearly proportional to strain.
$s t r e s s \propto s t r a i n$
$∴$ within elastic limit the graph must be linear.
As steel is not a elastic body so, it does not show a linear profile in elastic zone.

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