Chapter 3 – Synthetic Fibers and Plastics
Assignment 2
Q.1. Explain the differences between thermoplastics and thermosetting plastics.
Q.2. Explain why the following. are made up of thermosetting plastics?
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Q.3. Categorise the materials of the following products into “can be recycled” and “cannot be recycled” categories.
Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electric switches.
Q.4. Ravi wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Ravi, giving your reason.
Q.5. Give examples to show that plastics are non-corrosive in nature.
Q.6. Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.
Q.7. "Avoid plastics as far as possible". Comment on this advice.
Q.8. Match the terms of Column A correctly with the phrases given in Column B.
|
Column A |
Column B |
|
(a) Polyester |
(i) Prepared by using wood pulp. |
|
(b) Teflon |
(ii) Used for making parachutes and stockings. |
|
(c) Rayon |
(iii) Used to make non-stick cookware. |
|
(d) Nylon |
(iv) Fabrics do not wrinkle easily. |
Q.9. "Manufacturing synthetic fibres is actually helping conservation of forests". Comment.
Q.10. Describe an activity to show that thermoplastic is a poor conductor of electricity.
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