Science

Synthetic Fibres and Plastics

Question:

Explain the difference between thermoplastic and thermosetting plastics.

Answer:

There are two types of plastics: Thermosetting plastics and Thermoplastics. Thermosetting plastic Thermoplastic Thermosetting plastic cannot be bent easily. It may break when forced to bend. Thermoplastic can be bent easily. Thermosetting plastic cannot be softened by heating. Thus, it cannot be reshaped once moulded. Thermoplastic can be softened easily by heating. Thus, it can be reshaped.
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Questions and Answers

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.
Answer

Q 2.

Explain why some fibres are called synthetic.
Answer

Q 3.

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

Q 4.

Give examples which indicate that nylon fibres are very strong.
Answer

Q 5.

Explain the difference between thermoplastic and thermosetting plastics.
Answer

Q 6.

Explain why plastic containers are favoured for storing food.
Answer

Q 7.

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

Q 8.

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

Q 9.

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

Q 10.

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

Q 11.

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

Q 12.

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