Class 8 Science – Chapter 3
Synthetic Fibres and Plastics
Important Exam Questions

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🟠 A. Very Short Answer Questions (1 Mark)

1. What is rayon?
2. Name the first fully synthetic fibre.
3. Which plastic cannot be reshaped once moulded?
4. Name one use of nylon.
5. Is plastic biodegradable?
6. Which fibre resembles wool?

🟠 B. Short Answer Questions (2–3 Marks)

1. Define synthetic fibres. Give two examples.
2. Why is nylon used for making parachutes and ropes?
3. What are thermoplastics? Give two examples.
4. State two disadvantages of plastics.
5. Write any three properties of plastics.

🟠 C. Short Answer Questions (3–4 Marks)

1. Explain the difference between:
   • Natural fibres and synthetic fibres
   • Thermoplastics and thermosetting plastics
2. List four advantages of synthetic fibres.
3. Why are plastics used in electrical appliances?
4. Explain why plastics are non-biodegradable.

🟠 D. Long Answer Questions (5 Marks)

1. What are plastics? Describe their properties and uses.
2. Explain how plastics are harmful to the environment. What steps should we take to reduce plastic pollution?
3. Describe different types of synthetic fibres with their uses.

🟠 E. Case-Based / Application Questions

1. Why should we avoid using plastic bags? Suggest eco-friendly alternatives.
2. Why are handles of cooking utensils made of Bakelite?

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⭐ Focus on definitions, differences & environmental questions for exams!