Answer: volume falls as pressure rises.
- A pressure decreases as volume grows
- B the stress has no direction at all
- C volume falls as pressure rises
- D the strain is always negative
Correct answer: C. volume falls as pressure rises
Explanation: Increasing pressure reduces volume (ΔV is negative); the minus sign keeps the bulk modulus positive.
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.