III. Answer the following questions in one sentence.
1. Give an example of a natural fibre.
2. What is a polymer?
3. Name any two synthetic fibres.
4. Name the first man-made fibre.
5. Name a synthetic fibre that is obtained from crude oil.
6. Why are raincoats made of synthetic material?
7. Why is it not advisable to wear synthetic clothes in the kitchen?
8. Name the two types of plastics.
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Answer:
1.Jute
2.A substance which has a molecular structure bulid up chiefly or completely froma large number of similar units bonded together.
3.Rayon and nylon
4.Nylon
5.Nylon
6.They do not able to absorb water as they are waterproof.
7.Synthetic fibre catch fire easily.
8.Polyvinyl chloride and polyethylene terephthalate
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