Science

Synthetic Fibres and Plastics

Question:

Explain why plastic containers are favoured for storing food.

Answer:

The characteristics that make plastics favourable for storing food items are:(i) Light weight (ii) Lower price (iii) Good strength (iv) Easy handling
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Synthetic Fibres and Plastics

Q 1.

Categorize the materials of the following products into 'can be recycled' and 'cannot be recycled'. Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.

Q 2.

Explain why some fibres are called synthetic.

Q 3.

Give examples which indicate that nylon fibres are very strong.

Q 4.

Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.

Q 5.

Explain the difference between thermoplastic and thermosetting plastics.

Q 6.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Q 7.

Explain why plastic containers are favoured for storing food.

Q 8.

Explain why the following are made of thermosetting plastics. (a) Saucepan handles (b) Electric plugs/switches/plug boards

Q 9.

Give examples to show that plastics are non-corrosive in nature.

Q 10.

Describe an activity to show that thermoplastic is a poor conductor of electricity.

Q 11.

Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

Q 12.

Avoid plastics as far as possible'. Comment on this advice.