Answer: plastic.
- A plastic
- B elastic
- C rigid
- D simply dense
Correct answer: A. plastic
Explanation: Plastic materials retain the deformation once the load is removed.
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.