Synthetic Fibres and Plastics For Class 8 Science Important Questions

Q 1 –Which of the following is natural fibre?
(a) Rayon
(b) Nylon
(c) Polyester
(d) Cotton

Q 2 –Which of the following is synthetic fibre?
(a) Nylon
(b) Cotton
(c) Silk
(d) Wood

Q 3 –The basic component of plant fibres is
(a) protein
(b) cellulose
(c) starch
(d) none of these

Q 4 –Raw materials for preparation of synthetic fibres are obtained from
(a) coal
(b) petroleum
(c) natural gas
(d) all of these

Q 5 –Which of the following is known as artificial silk?
(a) Nylon
(b) Rayon
(c) Polyester
(d) Silk

Q 6 –Which fibre is used as artificial wool?
(a) Acrylic
(b) Rayon
(c) Nylon
(d) Cotton

Q 7 –Common variety of polyester is
(a) terylene
(b) polymer
(c) viscose
(d) spinneret

Q 8 –Which of the following polyester is made by blending polyester and cotton?
(a) Terrywool
(b) Terrycot
(c) Terrysilk
(d) PET

Q 9 –Which of the following are made from thermosetting plastic?
(a) Bottles
(b) Crockery
(c) Shoes
(d) Handbags

Q 10 –Synthetic fibres are
(a) durable
(b) wrinkle free
(c) economical
(d) all of these

Q 11 –Fill in the blanks

  1. Clothes we wear are made up of thin strands called ……………..
  2. Fibres may be natural or ……………..
  3. Raw materials for preparation of synthetic fibres are obtained from substances like …………….. , …………….. and ……………..
  4. …………….. are made up of small repeating units, joined together through bonds in linear pattern.
  5. Artificial silk is another name of ……………..

Q 12 –True or false

  1. Rayon is a natural fibre.
  2. Artificial silk is another name for silk.
  3. Rayon synthesised for the first time in England.
  4. Nylon was made in 1931.
  5. Polyester is the strongest synthetic fibre.

Q 13 –Match the following

Column A

Column B

1. Polythene

a. Natural fibre

2. Fabric

b. Bad conductor of heat and electricity

3. Plastics

c. Choke respiratory system of animals

4. Polymers

d. Made from fibres

5. Cotton

e. Made from small units of monomers

Q 14 –Why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen?

Q 15 – Write some properties and uses of melamine.

Q 16 –Describe about nylon. Write its uses and properties.

Q 17 – ‘Plastics are hazard to environment’. Explain this statement.

Q 18 –List the strategies for plastic waste management.

Q 19 –Devise an activity to show that organic waste is biodegradable while plastic is not.

Q 20 –Write the advantages of synthetic fibres.

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