MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
Which is the relationship between stress and strain?
Think it through first, then pick an option.
- a inversely proportional
- b directly proportional
- c proportional to the square root
- d inversely proportional to the square
Answer and explanation
Correct answer: b directly proportional
Within the elastic limit stress ∝ strain, that is stress = constant × strain.
Why the other options are wrong
- a inversely proportional: In Hooke's law stress is directly proportional to strain; if it were inverse, more strain would give less stress.
- c proportional to the square root: Hooke's law has no square-root relation; stress is directly proportional to strain.
- d inversely proportional to the square: Hooke's law has no inverse-square relation; the relation is simple direct proportion.
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