1. Why is acrylic more popular than wool?
2. What is the difference between natural and synthetic fibres?
3. Write a few characteristics of synthetic fibres.
4. What is 4R principle?
5. What are biodegradable and non-biodegradable materials?
6. What are the disadvantages of plastics?
7. Why is it convenient to store plastic containers than metals?
8. What are the uses of nylon?
9. What do you mean by synthetic fibres?
10. Why is it advisable to not wear synthetic clothes while working near fire?
Answers
Answer:
Q1. The wool obtained from natural sources is quite expensive ,whereas clothes made from acrylic are relatively cheap. ... Though they couldn't absorb moist and sweat ,they are of good quality for fashionable clothes. They are more durable and affordable which makes them more popular than natural fibres
Q2. Natural fabrics, like merino wool, cotton, cashmere, and silk, are made of fibers that are produced by animals and plants. Synthetic fabrics, like polyester, nylon and acrylic, are "man-made" fibers that are created in laboratories.
Q3. Characteristics of Synthetic Fibres
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.
Synthetic fibres are easy to maintain and wash.
Q4. A number of waste prevention techniques are available, and they are commonly summarized as the so-called 4Rs: reduction, reuse, recycling and recovery.
Q5. Biodegradable substances are those that degrades or break down naturally. ... Materials like plants, animals, their waste, paper, fruits, flowers, vegetables fall under biodegradable substances, on the other hand, rubber, plastic, chemicals, paint plastic falls under the category of the non-biodegradable items.
Q6. Plastic bags thrown carelessly on roads get into drains and the sewer system and choke them. ...
Plastics give out harmful gases upon heating or burning which causes air pollution and many health problems.
Plastic bags filled with garbage is thrown away in the open.
Q7. Plastic containers seem more convenient than metal containers. This is because of their light weight, lower price, good strength and easy handling. Being lighter as compared to metals, plastics are used in cars, aircrafts and spacecrafts also.
Q8. Uses of Nylon
Clothing – Shirts, Foundation garments, lingerie, raincoats, underwear, swimwear and cycle wear.
Industrial uses – Conveyer and seat belts, parachutes, airbags, nets and ropes, tarpaulins, thread, and tents.
It is used to make a fish net
Q9. Synthetic fibers are fibers made by humans through chemical synthesis
Q10. Synthetic fibers melt on heating. If they catch fire, they melt and stick to the body of the person wearing them. This is why it is advised not to wear clothes made of synthetic fiber while working in a kitchen or in a fire laboratory.