Question

3. Fill in the blanks:
1) Synthetic fibres are also called ________ and ________ fibres.
2) Acrylic fibres are a substitute of ________.
3) Thermoplastics ________ on heating and become ________ when cooled.
4) A plastic used for making crockery is ________.
5) Plastics are ________ and on burning releases ________ gases.

Answer 1

1) Synthetic fibres are also called man made and artificial fibres.

2) Acrylic fibres are a substitute of wool.

3) Thermoplastics molten on heating and become harden when cooled.

4) A plastic used for making crockery is PET (poly-ethylene).

5) Plastics are disposable and on burning releases sulphur dioxide gases.

Answer 2

Answer:

1. Man made and artificial fibre

2.wool

3.molten and harden

4.Pet(polythene)

5.Disposable and poisonous gases

Explanation:

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