Chapter 3 – Synthetic Fibres and Plastics
Assignment 1
Q.1. Name a natural polymer occurring in plants.
Q.2. Name a synthetic fibre which works like wool.
Q.3. Why is polyester not suitable for summer wear?
Q.4. Why rayon is different from synthetic fibres?
Q.5. Write any two advantages of synthetic fibres.
Q.6. Name the unit used in the formation of a polymer.
Q.7. Name the polymer which is used in making non-stick cookware.
Q.8. Name the polymer which is commonly used as a packaging material.
Q.9. Why cotton, wool and silk are natural fibres?
Q.10. Why are some fibres called synthetic?
Q.11. Mark the correct answer.
Rayon is different from synthetic fibres because
(a) it has a silk like appearance
(b) it is obtained from wood pulp
(c) its fibres can also be woven like those of natural fibres
Q.12. Fill in the blanks with appropriate words.
(a) Synthetic fibres are also called ............... or ............... fibres.
(b) Synthetic fibres are synthesised from raw materials called ............... .
(c) Like synthetic fibres, plastic is also a ............... .
Q.13. Give examples which indicate that nylon fibres are very strong.
Q.14. Explain why plastic containers are favoured for storing food?
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