A) PVC, PMMA, polystyrene
B) Polythene, Bakelite, nylon-6
C) Glyptal, Melmac, PAN
D) Polypropylene, urea-formaldehyde, Teflon
Correct Answer: A
Solution :
[a] Thermoplastics are the plastics which become soft on heating and hard on cooling, i.e., they can be moulded again and again, e.g. PVC, polythene, PMMA, polystyrene, polypropylenem, Teflon, etc. Note: Melmac, Bakelite and urea-formaldehyde are thermosetting polymers.
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