synthetic fibres

Question 1

monomers

Answer 1

each small unit is a chemical substance called monomers

Question 2

polymers

Answer 2

when monomers join together to form large units is called polymers

Question 3

types of synthetic fibres

Answer 3

1. rayon
2. nylon
3. polyester
4. acrylic fibre

Question 4

rayon

Answer 4

it is made up from wood pulp. resembles silk and is also called artificial silk. uses- textile industry, bed sheets, aprons, carpets etc

Question 5

nylon

Answer 5

it is a polyamide fibre, uses fishing nets, climbing ropes, shirts, socks. it is strong, lightweight, lustrous, extremely fine, wrinkle free does not absorb water.

Question 6

characterstics of synthetic fibres

Answer 6

Synthetic fibres are cheaper than natural fibre.
Synthetic fibres are stronger than natural fibre.
Synthetic fibres are more durable than natural fibre.
Synthetic fabrics are dried up in less time.

Question 7

polyester

Answer 7

made up of repeating units of a chemical called ester. dress, curtains, suits, shirts etc

Question 8

acrylic fibres

Answer 8

lightweight, soft and warm. jackets, blankets, shawls etc

Question 9

themoplastic

Answer 9

gets easily deformed and can be moulded again and again. ex- polythene

Question 10

thermo setting plastics

Answer 10

do not become soft on heating, once moulded cant be moulded again. ex- bakelite, melamine

Question 11

plastics and enviroment

Answer 11

plastics are non- biodegradable. they cause air, water, soil pollution and it also cause animal deaths