Question

LONG ANSWER TYPE QUESTIONS
1. Mention two advantages and two disadvantages of synthetic fibres.
Write any two characteristic properties and two important uses of each of the followi
(a) Polythene
(b) Teflon
(c) Bakelite
(d) Melamine
3. How does the excessive use of plastics affect the environment?
4. Explain how you would compare the strength of threads of different materials.
5. How can you control the problems caused by plastics?​

Answer 1

Explanation:

1) Advantages of Synthetic Fibres

Advantages of Synthetic FibresSynthetic fibres have the following advantages:-

1.Most synthetic fibres have good elasticity.

2.Most fabrics made of synthetic fibres do not wrinkle easily.

3.Fabrics made of synthetic fibres are generally more durable, less expensive, and more readily available than those made of natural fibres.

4.Most synthetic fibres can handle heavy loads without breaking.

Synthetic fibres have the following disadvantages.

1.Most fabrics made from synthetic fibres require careful ironing as they melt easily.

2.Most fabrics made from synthetic fibres absorb very little moisture. They become sticky when the body sweats, which makes them uncomfortable to wear in hot weather.

3.Most fabrics made from synthetic fibres catch fire very easily. Therefore, it is dangerous to wear them near a source of fire (e.g., while working in the kitchen).

Answer 2

Answer:

Adventages

1 Synthetic fibres are very durable and do not wrinkle easily.

2 They are elastic and can be easily stretched out.

Disadvantages

1 The mono-fibers do not trap air pockets like cotton and provide poor insulation.

2 Synthetic fibers burn more rapidly than natural.