Polymers which soften on heating and harden when cooled are?

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Polymers which soften on heating and harden when cooled are? Answer: Thermoplastics

Thermoplastic polymers are softened by heat and hardened on cooling. This process is reversible, meaning they can be reshaped repeatedly. Examples: Polyethylene (PE), Polystyrene (PS), PVC, Nylon.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.