Which term describes a material that remains pliable and can be reshaped repeatedly before setting?

• A. Smart fibres
• B. Thermochromic ink
• C. Polymorph
• D. Composite materials

Answer: (C)

The statement tests how a material can be softened, shaped, and then harden, while allowing this process to be repeated many times. Polymorph fits this idea: it’s a low-melting thermoplastic used for modeling. When placed in hot water, it becomes pliable and can be molded into a shape; as it cools, it sets. You can reheat it and reshape it again and again until you’re satisfied. This repeatable softening and reshaping is a hallmark of thermoplastics, which distinguishes Polymorph from other choices. Smart fibres are fabrics that respond to stimuli, thermochromic ink changes color with temperature, and composite materials are combinations of different materials that aren’t defined by repeated reshaping before setting in the same way.