Question

8. Which of the following plastics cannot be melted again and again on heating? (a) Polythene (b) PVC (c) Bakelite (d) All of these​

Answer 1

Answer:

(b) cotton

Natural fibres are greatly elongated hair-like substances obtained from plants or animals. They can be spun into filaments, threads or ropes. Cotton fibre is almost pure cellulose that grows in a protective capsule around the seeds of cotton plants.