Class 8 Science – Chapter 3
Synthetic Fibres and Plastics
MCQs (Exam Level)

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1. Which of the following is a synthetic fibre?
   a) Cotton
   b) Wool
   c) Nylon
   d) Silk

   Answer: c) Nylon

2. Rayon is obtained from:
   a) Petroleum
   b) Wood pulp
   c) Coal
   d) Cotton seeds

   Answer: b) Wood pulp

3. Which synthetic fibre resembles silk?
   a) Nylon
   b) Polyester
   c) Rayon
   d) Acrylic

   Answer: c) Rayon

4. Which plastic can be softened on heating and reshaped?
   a) Bakelite
   b) Melamine
   c) Thermosetting plastic
   d) Thermoplastic

   Answer: d) Thermoplastic

5. Which of the following is a thermosetting plastic?
   a) PVC
   b) Polythene
   c) Bakelite
   d) Nylon

   Answer: c) Bakelite

6. Plastic is not biodegradable because:
   a) It is soft
   b) It is colourful
   c) Microorganisms cannot decompose it
   d) It dissolves in water

   Answer: c) Microorganisms cannot decompose it

7. Which property makes plastics suitable for storing food?
   a) High conductivity
   b) Reactivity
   c) Non-reactive nature
   d) Transparency

   Answer: c) Non-reactive nature

8. Which plastic is used for making electrical switches?
   a) PVC
   b) Polythene
   c) Bakelite
   d) Polyester

   Answer: c) Bakelite

9. Which fibre is known as artificial wool?
   a) Nylon
   b) Rayon
   c) Acrylic
   d) Polyester

   Answer: c) Acrylic

10. Burning plastics is harmful because:
    a) It releases oxygen
    b) It produces pleasant smell
    c) It releases poisonous gases
    d) It reduces pollution

    Answer: c) It releases poisonous gases

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