The Hooke’s law is valid for
[amp_mcq option1=”only proportional region of the stress-strain curve” option2=”entire stress-strain curve” option3=”entire elastic region of the stress-strain curve” option4=”elastic as well as plastic region of the stress-strain curve” correct=”option1″]
This question was previously asked in
UPSC CDS-1 – 2019
The correct answer is A. Hooke’s law states that the stress is directly proportional to the strain within the elastic limit of a material. More specifically, this linear relationship holds true only in the initial part of the elastic region, which is known as the proportional region. Beyond the proportional limit, the material may still behave elastically (return to its original shape upon unloading), but the stress-strain relationship becomes non-linear.
Hooke’s law (Stress ∝ Strain) is strictly valid only in the proportional region of the stress-strain curve.