Answer: Stress is directly proportional to strain.
- A Stress is inversely proportional to strain
- B Stress is directly proportional to strain
- C Stress equals strain
- D Stress is independent of strain
Correct answer: B. Stress is directly proportional to strain
Explanation: Hookes law: stress is proportional to strain within the elastic limit, with the modulus as the constant of proportionality.
A typical stress-strain curve: the initial straight line (Hooke's Law region, slope = Young's modulus) ends at the elastic limit; beyond the yield point, deformation becomes permanent, peaking at the ultimate tensile strength before the wire finally fractures.
Concept context
Stress, strain, Hookes law, and the elastic moduli that describe how solids deform and recover under load.