Answer: bulk modulus.
- A Young's modulus
- B shear modulus
- C all three moduli
- D bulk modulus
Correct answer: D. bulk modulus
Explanation: A gas cannot sustain shear or tension but resists volume change, so it has only a bulk modulus.
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.