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Question

Assertion :Yield strength is the stress required to produce a small specific amount of deformation. Reason: The offset yield strength can be determined by the stress corresponding to the intersection of the stress-strain curve and a line parallel to the elastic line offset by a strain of 0.2 or 0.1%.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
AElastic limit.
BYield Point.
After elastic limit, we required a small stress to be deformed.And in this AB region if the metal reach,then if is not possible to regain its shape.Also we can measure the yield strength by graph.

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