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Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers
I. Choose the correct option.
Question 1.
Which of the following is natural fibre?
(a) Rayon
(b) Nylon
(c) Polyester
(d) Cotton
Answer
Answer: (d) Cotton
Question 2.
Which of the following is synthetic fibre?
(a) Nylon
(b) Cotton
(c) Silk
(d) Wood
Answer
Answer: (a) Nylon
Question 3.
The basic component of plant fibres is
(a) protein
(b) cellulose
(c) starch
(d) none of these
Answer
Answer: (b) cellulose
Question 4.
Raw materials for preparation of synthetic fibres are obtained from
(a) coal
(b) petroleum
(c) natural gas
(d) all of these
Answer
Answer: (d) all of these
Question 5.
Which of the following is known as artificial silk?
(a) Nylon
(b) Rayon
(c) Polyester
(d) Silk
Answer
Answer: (b) Rayon
Question 6.
In which year was nylon made?
(a) 1931
(b) 1964
(c) 1948
(d) 1950
Answer
Answer: (a) 1931
Question 7.
Which fibre is used as artificial wool?
(a) Acrylic
(b) Rayon
(c) Nylon
(d) Cotton
Answer
Answer: (a) Acrylic
Question 8.
Which of the following fibre has highest tensile strength?
(a) Cotton
(b) Silk
(c) Rayon
(d) Nylon
Answer
Answer: (d) Nylon
Question 9.
Common variety of polyester is
(a) terylene
(b) polymer
(c) viscose
(d) spinneret
Answer
Answer: (a) terylene
Question 10.
Polymers are made up of small units called
(a) layers
(b) molecules
(c) cells
(d) monomers
Answer
Answer: (d) monomers
Question 11.
Which of the following polyester is made by blending polyester and cotton?
(a) Terrywool
(b) Terrycot
(c) Terrysilk
(d) PET
Answer
Answer: (b) Terrycot
Question 12.
Wood pulp is used to make
(a) plastic
(b) wool
(c) jute
(d) rayon
Answer
Answer: (d) rayon
Question 13.
The property of materials by which they can be moulded into any shape is called
(a) conductivity
(b) elasticity
(c) plasticity
(d) none of these
Answer
Answer: (c) plasticity
Question 14.
Which of the following is a thermoplastic?
(a) Bakelite
(b) Melamine
(c) PVC
(d) Ail of these
Answer
Answer: (c) PVC
Question 15.
Which of the following are made from thermosetting plastic?
(a) Bottles
(b) Crockery
(c) Shoes
(d) Handbags
Answer
Answer: (b) Crockery
Question 16.
Polycarbonate is used to make
(a) compact discs
(b) straws
(c) bottles
(d) jars
Answer
Answer: (a) compact discs
Question 17.
Synthetic fibres are
(a) durable
(b) wrinkle free
(c) economical
(d) all of these
Answer
Answer: (d) all of these
Question 18.
Plastics that retain their plasticity on repeated heating are called
(a) thermosetting plastics
(b) thermoplastics
(c) thermal plastics
(d) none of these
Answer
Answer: (b) thermoplastics
Question 19.
Which of the following is a characteristic of plastics?
(a) Electrical conductors
(b) Heat conductors
(c) Biodegradable
(d) Non-biodegradable
Answer
Answer: (d) Non-biodegradable
Question 20.
Plastic that can resist fire is
(a) bakelite
(b) melamine
(c) PVC
(d) duroplast
Answer
Answer: (b) melamine
II. Fill in the Blanks
Question 1.
Clothes we wear are made up of thin strands called ……………..
Answer
Answer: Fibres
Question 2.
Fibres may be natural or ……………..
Answer
Answer: man-made
Question 3.
Raw materials for preparation of synthetic fibres are obtained from substances like …………….. , …………….. and ……………..
Answer
Answer: coal, petroleum, natural gas
Question 4.
…………….. are made up of small repeating units, joined together through bonds in linear pattern.
Answer
Answer: Polymers
Question 5.
Rayon synthesised for the first time in ……………..
Answer
Answer: England
Question 6.
Artificial silk is another name of ……………..
Answer
Answer: rayon
Question 7.
…………….. fibre is stronger than steel wire of same thickness.
Answer
Answer: Nylon
Question 8.
…………….. is the property of materials by which they can be moulded into any shape.
Answer
Answer: Plasticity
Question 9.
…………….. is an example of thermosetting plastics.
Answer
Answer: Crockery
Question 10.
Biodegradable plastics are being developed from plant materials such as …………….. and ……………..
Answer
Answer: cellulose, starch
Question 11.
Practicing 4R’s, i.e., …………….. , …………….. , …………….. , and …………….. should be encouraged.
Answer
Answer: Reduce, Reuse, Recycle, Recover
Question 12.
A device with holes which is used to make fibres is called ……………..
Answer
Answer: spinneret
Question 13.
Acrylic resembles ……………..
Answer
Answer: wool
Question 14.
Synthetic fibres do not absorb much ……………..
Answer
Answer: water
Question 15.
Synthetic fibres …………….. on heating.
Answer
Answer: melts
III. True or False
Question 1.
Rayon is a natural fibre.
Answer
Answer: False
Question 2.
Artificial silk is another name for silk.
Answer
Answer: False
Question 3.
Rayon synthesised for the first time in England.
Answer
Answer: True
Question 4.
Nylon was made in 1931.
Answer
Answer: True
Question 5.
Polyester is the strongest synthetic fibre.
Answer
Answer: False
Question 6.
Rayon is the first man-made cellulose fibre.
Answer
Answer: True
Question 7.
Synthetic fibres shrink a lot when washed.
Answer
Answer: False
Question 8.
Terylene is a common variety of polyester.
Answer
Answer: True
Question 9.
Terrywool is made by blending polyester and silk.
Answer
Answer: False
Question 10.
Nylon is used in combs and toothbrushes.
Answer
Answer: True
Question 11.
Bakelite and melamine are thermoplastics.
Answer
Answer: False
Question 12.
Synthetic fibres are moth and insect resistant.
Answer
Answer: True
Question 13.
If plastics are burnt, they evolve oxygen gas.
Answer
Answer: False
Question 14.
Jammu & Kashmir has banned the use of plastic bags.
Answer
Answer: True
Question 15.
Plastics are corrosive in nature.
Answer
Answer: False
IV. Match the following
| Column I | Column II |
| 1. Silk | (a) Non-stick coating |
| 2. Teflon | (b) Rayon |
| 3. Polymers | (c) Natural fibre |
| 4. Artificial silk | (d) Grasim India |
| 5. Largest producer of rayon | (e) Small units joined together |
| 6. Terylene | (f) Thermosetting plastic |
| 7. Acrylic | (g) Polyester |
| 8. Bakelite | (h) Polyvinyl chloride |
| 9. A single unit | (i) Artificial wool |
| 10. PVC | (j) Monomer |
Answer
Answer:
| Column I | Column II |
| 1. Silk | (c) Natural fibre |
| 2. Teflon | (a) Non-stick coating |
| 3. Polymers | (e) Small units joined together |
| 4. Artificial silk | (b) Rayon |
| 5. Largest producer of rayon | (d) Grasim India |
| 6. Terylene | (g) Polyester |
| 7. Acrylic | (i) Artificial wool |
| 8. Bakelite | (f) Thermosetting plastic |
| 9. A single unit | (j) Monomer |
| 10. PVC | (h) Polyvinyl chloride |
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