Synthetic Fibres and Plastics MCQs Class 8
CBSE Class 8 Science – MCQs with Answers & Explanations
Section 3: Synthetic Fibres and Plastics
Topic: Synthetic Fibres and Plastics MCQs Class 8
Based on NCERT | CBSE Board Examinations
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 Science examination preparation.
1. Synthetic fibres are made from:
Answer: C
Explanation: Synthetic fibres are man‑made using chemical substances derived mainly from petrochemicals.
Explanation: Synthetic fibres are man‑made using chemical substances derived mainly from petrochemicals.
2. Which is a synthetic fibre?
Answer: C
Explanation: Nylon is the first fully synthetic fibre developed in laboratories.
Explanation: Nylon is the first fully synthetic fibre developed in laboratories.
3. Synthetic fibres are also called:
Answer: C
Explanation: Since they are made from petrochemicals, they are called petro fibres.
Explanation: Since they are made from petrochemicals, they are called petro fibres.
4. Rayon is made from:
Answer: A
Explanation: Rayon is a semi‑synthetic fibre made from cellulose obtained from wood pulp.
Explanation: Rayon is a semi‑synthetic fibre made from cellulose obtained from wood pulp.
5. Nylon is known for:
Answer: B
Explanation: Nylon fibres are strong, elastic and lightweight.
Explanation: Nylon fibres are strong, elastic and lightweight.
6. Polyester is used in making:
Answer: B
Explanation: Polyester fibres and PET plastics are widely used commercially.
Explanation: Polyester fibres and PET plastics are widely used commercially.
7. Plastics are:
Answer: B
Explanation: Plastics are long‑chain synthetic polymers.
Explanation: Plastics are long‑chain synthetic polymers.
8. Which plastic can be remoulded?
Answer: B
Explanation: Thermoplastics soften on heating and can be reshaped.
Explanation: Thermoplastics soften on heating and can be reshaped.
9. Bakelite is a:
Answer: B
Explanation: It becomes hard permanently after heating.
Explanation: It becomes hard permanently after heating.
10. Plastics are non‑biodegradable because:
Answer: B
Explanation: Microorganisms cannot break plastic polymers easily.
Explanation: Microorganisms cannot break plastic polymers easily.
11. Terylene is a type of:
Answer: B
Explanation: Terylene is a polyester fibre.
Explanation: Terylene is a polyester fibre.
12. Acrylic is used as substitute for:
Answer: C
Explanation: Acrylic is called artificial wool.
Explanation: Acrylic is called artificial wool.
13. PET stands for:
Answer: A
Explanation: PET is widely used in bottles and packaging.
Explanation: PET is widely used in bottles and packaging.
14. Melamine is used for:
Answer: C
Explanation: Melamine is heat resistant and durable.
Explanation: Melamine is heat resistant and durable.
15. Plastics are poor conductors of:
Answer: A
Explanation: Hence used in electrical insulation.
Explanation: Hence used in electrical insulation.
16. 5R principle includes all EXCEPT:
Answer: D
Explanation: 5R promotes minimizing plastic use.
Explanation: 5R promotes minimizing plastic use.
17. Synthetic fibres melt on heating so:
Answer: B
Explanation: They stick to skin causing burns.
Explanation: They stick to skin causing burns.
18. Polythene bags cause:
Answer: B
Explanation: Non‑biodegradable waste accumulates.
Explanation: Non‑biodegradable waste accumulates.
19. Biodegradable plastics are:
Answer: A
Explanation: New eco‑friendly plastics decompose naturally.
Explanation: New eco‑friendly plastics decompose naturally.
20. Synthetic fibres are preferred because they are:
Answer: B
Explanation: They are strong, elastic and easy to maintain.
Explanation: They are strong, elastic and easy to maintain.
