NEET Physics Stress & Strain MCQ Question
Which of the following statements about stress and strain in materials is correct?
Permanent deformation occurs when the material is subjected to stress beyond its elastic limit.
All materials recover their original dimensions after the removal of stress.
Ductile materials have a close ultimate strength and fracture point.
Strain is always proportional to stress in plastic deformation.
Correct Answer
Detailed Explanation
Statement A is correct as it describes permanent set due to exceeding the elastic limit, consistent with the definition of plastic deformation. Statement B is incorrect because materials can have permanent deformation. Statement C is misleading as ductile materials typically have a far apart ultimate strength and fracture point. Statement D is false since plastic deformation does not adhere to the proportionality of stress and strain.
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