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