Synthetic Fibres and Plastics Important Questions Answers
Let us tell the students studying in class 8 that you can get the question answers of all the chapters of class 8th from our website. By using these question answers, you can easily prepare for all the subjects. Therefore, today in this post, thequestion answers of class 8 Science chapter 3 synthetic fibers and plasticsare given. Read these question answers carefully, it will be beneficial for you. If you like the information given in these questions, then definitely share it with your friends.
Question 1. Name some natural fibers.
Answer: Cotton, wool, silk.
Question 2. Name a natural polymer.
Answer: Cellulose.
Question 3. Name the fiber that is similar to silk but is man-made.
Answer: Rayon.
Question 4. Which fiber is obtained from wood pulp?
Answer: Rayon.
Question 5. In which year was nylon made?
Answer: 1931.
Question 6. Which fiber is made from coal, air, and water?
Answer: Nylon.
Question 7. Which fiber is used to make parachutes and tents?
Answer: Nylon.
Question 8. What is PET?
Answer: It is a type of polyester used in making bottles, utensils, film, and wire.
Question 9. Why are parachutes and rock climbing ropes made of nylon?
Answer: Because of its strength.
Question 10. Mention some characteristics of plastic.
Answer: Plastic has properties of recycling, reusability, coloring, melting, and can be made into sheets and wires.
Question 11. What are polyethylene and PVC?
Answer: They are thermoplastics.
Question 12. Bakelite is an example of which type of plastic?
Answer: Thermosetting plastic.
Question 13. Where is Teflon used?
Answer: Teflon is used in non-stick cookware.
Question 14. Give two examples of thermoplastic.
Answer: (i) Polyethylene (ii) PVC.
Question 15. Why do plastic bottles lose their shape with hot water?
Answer: Because plastic bottles are made of thermoplastics, which melt when heated.
Question 16. Which thermosetting plastic is vaporizable, heat resistant, and fireproof?
Answer: Melamine.
Question 17. Why is plastic used instead of metals in cars, airplanes, etc.?
Answer: Because it is lighter than metals.
Question 18. Why are plastic containers easy to use?
Answer: Plastic containers are lightweight, cheap, strong, and easy to handle.
Question 19. Name two non-biodegradable substances.
Answer: (1) Plastic (2) Metal utensils.
Question 20. Write two reasons for using artificial fibers instead of natural fibers.
Answer: Durability and availability.
Question 21. What is one major harmful property of synthetic fibers?
Answer: They melt when heated.
Question 22. What are biodegradable substances?
Answer: Biodegradable substances are those that do not decompose by bacteria and are called non-degradable substances.
Question 23. Which substance is responsible for the death of animals and blockage of drains?
Answer: Plastic bags.
Question 24. What is the 4R principle?
Answer: Reduce, Reuse, Recycle, and Recover.
Question 25. Plastic is non-degradable. Is it environmentally friendly or hostile?
Answer: Environmentally hostile.
Question 26. What are synthetic fibers?
Answer: Synthetic fibers are fibers made by humans, different from natural fibers. A synthetic fiber is a chain made by joining small units.
Question 27. Give some examples of synthetic fibers.
Answer: Rayon, nylon, polyester, plastic, acrylic, terrylene, etc.
Question 28. Mention the uses of polyethylene.
Answer: Polyethylene sheets for packing, bags for milk packing, polyethylene containers, and pipes for storage and transfer of water, oil, and other substances. It is also used as a waterproof material.
Question 29. Write some uses of PVC.
Answer: PVC is used for making bottles, floor tiles, raincoats, shoe soles, sandals, and leather-like materials.
Question 30. What are biodegradable substances?
Answer: Biodegradable substances are those that can be easily decomposed by microorganisms (bacteria). Dead bodies of organisms, human excreta, and many other substances are decomposed by bacteria into simple compounds. Such substances are called biodegradable.
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