Q14 of 83 Page 55

Which of the two is a thermosetting plastic: PVC or bakelite?

The plastics which cannot be softened by heating, when moulded once are called thermosetting plastics. Bakelite is a thermosetting plastic.


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12

Name four different plastics.

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Give one use of Teflon.

 15

Fill in the following blanks with suitable words:

(a) Synthetic fibres are also called..........or……fibres.


(b) Synthetic fibres are made from raw materials called.............


(c) Like synthetic fibres, plastic is also a ............


(d) The use of plastics can be reduced by using bags made of ............or ................instead of polythene bags.

 16

What is a polymer? Name the natural polymer from which cotton is made.