Which of the following is a natural polymer?
Protein
Polythene
Buna-S
Bakelite
Choose the thermoplastics and thermosetting plastics from the following :
Melamine, Polythene, Bakelite, Polyvinyl chloride
The plastic which is coated on the uniforms of fireman to make them fire -resistant is :
(a) bakelite (b) polythene (c) teflon (d) melamine