MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics

MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics

1. Polythene and PVC are examples of
(a) Bio degradable substance
(b) Thermosetting plastics
(c) Thermoplastics
(d) Rayon
► (c) Thermoplastics

2. _____ is blended with wool for making carpets.
(a) Rayon
(b) Nylon
(c) Polystyrene
(d) Polyester
► (a) Rayon

3. Fabric is made of
(a) steel
(b) fibre
(c) paper
(d) none of these
► (b) fibre

4. The raw materials used in making nylon
(a) Wood pulp
(b) Cellulose
(c) Coal, water, air
(d) All of these
► (c) Coal, water, air

5. Which of the following set of features belong to thermoplastics ?
(a) soft and brittle
(b) hard and strong
(c) hard and less brittle
(d) soft and less brittle
► (d) soft and less brittle

6. Which of the following is a thermosetting plastic ?
(a) Nylon
(b) PTFE
(c) Polyester
(d) Melamine
► (d) Melamine

7. First synthetic fibre formed from natural material is:
(a) Rayon
(b) Acrylon
(c) Nylon
(d) Polyester
► (a) Rayon

8. Statement incorrect for synthetic fibres is/are:
(a) non-biodegradable
(b) very expensive
(c) long lasting
(d) all the above
► (b) very expensive

9. The first man-made fibre is
(a) nylon
(b) polyester
(c) rayon
(d) cotton
► (c) rayon

10. Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather?
(a) Synthetic fibres catch fire very easily.
(b) Synthetic fibres do not absorb sweat.
(c) Synthetic fibres stick to the body.
(d) Both (b) and (c).
► (d) Both (b) and (c).

11. A man- made fibre obtained from natural source is :
(a) Acrylic
(b) Nylon
(c) Rayon
(d) Polyester
► (c) Rayon

12. Fibre obtained by chemical treatment of wood pulp is called ___________.    
(a) Natural silk
(b) Rayon
(c) Nylon
(d) Polyester
► (b) Rayon

13. When plastics are burnt they release:
(a) oxygen gas
(b) biogas
(c) toxic gases
(d) nitrogen gas
► (c) toxic gases

14. The strongest fibre is called:
(a) rayon
(b) nylon
(c) acrylic
(d) none of these
► (b) nylon

15. Remoulding can be done of :
(a) Polyvinyl chloride
(b) Bakelite
(c) Melamine
(d) Formaldehyde
► (a) Polyvinyl chloride

16. Raw materials for the synthetic fibres are derived from :
(a) petroleum products
(b) plant products
(c) animal products
(d) only coal
► (a) petroleum products

17. The lightweight plastic material is :
(a) Polypropylene
(b) Polythene
(c) Bakelite
(d) Polyester
► (a) Polypropylene

18. The small units used in making synthetic fibres are:
(a) molecules
(b) polymers
(c) cells
(d) none of these
► (b) polymers

19. Which of the following is not a characteristic of plastics?
(a) Plastics are poor conductors of heat.
(b) Plastics are insoluble in water.
(c) Plastics are non-inflammable.
(d) Plastics do not react with water and air.
► (c) Plastics are non-inflammable.

20. The oldest synthetic plastic is :
(a) Polyester
(b) Bakelite
(c) Melamine
(d) Polythene
► (b) Bakelite

21. Plastics are generally made from
(a) coal
(b) plant products
(c) kerosene
(d) petroleum
► (d) petroleum

22. Which of the following is used for making stockings and parachutes?
(a) Bakelite
(b) Wool
(c) Nylon
(d) Cotton
► (c) Nylon

23. Which of the following materials is the best for making garments and jackets that can be used in wet or damp environment?
(a) Polyester
(b) Wool
(c) Cotton
(d) None of these
► (a) Polyester

24. The fibre made up by the chemical treatment of wood pulp is
(a) Rayon
(b) Nylon
(c) Polyester
(d) None of these
► (a) Rayon
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