Q56 of 83 Page 57

Rayon is different from truly synthetic fibres because:

Rayon is the man-made fibre which is regarded as artificial silk. It is obtained by the chemical treatment of wood pulp or cellulose.

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54

Explain why, thermoplastics become soft on heating but thermosetting plastics do not become soft on heating. Draw labelled diagrams to illustrate your answer.

 55

What is meant by biodegradable and non-biodegradable materials? Give examples of two biodegradable and two non-biodegradable materials.

 57

The synthetic material which can be used for marking fabrics as well as shatterproof bottles and jars is:

 58

Which of the following has cross-linked polymer chains?