Assertion :Ratio of stress and strain is always constant for a substance. Reason: This ratio is called modulus of elasticity,

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 D Both Assertion and Reason are incorrect
Ratio of stress and strain is constant only in the proportionality limit. Modulus of elasticity is also defined only for this stage. Thus both statements are incorrect in general.

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