Synthetic fibers are A ) Light and easily washable B ) not washable C ) very hard D ) None of these Synthetic fibers are A ) Light and easily washable... B ) not washable C ) very hard D ) None of these Synthetic fibers are A ) Light and easily washable B ) not washable C ) very hard D ) None of these answer
Answers
Rayon is different from synthetic fibres because:
• It has a silk like appearance.
• It is obtained from wood pulp.
• Its fibres can also be woven like those of natural fibres.
• It is obtained from wood pulp.
Ans. It is obtained from wood pulp
3. Fill in the blanks with appropriate word:
a) Synthetic fibres are also called man-made or artificial fibres.
b) Synthetic fibres are synthesized from raw-materials called petrochemicals.
c) Like synthic fibres, plastic is also a polymer.
4. Give examples which indicate that nylon fibres are very strong.
Ans. Nylon fibres are very strong so they are used for making parachutes and ropes for rock-climbing.
5. Explain why plastic containers are favored for storing food?
Ans. Plastics do not react with food items and they are strong, light and durable. Hence they are favored for storing food.
6. Explain the differences between thermoplastics and thermosetting plastics.
Ans. Differences:
ThermoplasticsThermosetting plastics1. These are the plastics that can be deformed easily on heating and can bend also.
2. They are used for manufacturing cars, toys and containers.1. These are the plastics that cannot be softened by heating once they are moulded.
2. Bakelites are used for making electrical switches, handles for various utensils etc.