🧵 Synthetic Fibres and Plastics – MCQs for Class 8 Science

Part 1: Q1 – Q25

Q1. Which of the following is a synthetic fibre?

A) Cotton
B) Wool
C) Nylon
D) Silk

✅ Correct Answer: C) Nylon

Explanation:

• A) Cotton – Natural fibre.
• B) Wool – Natural animal fibre.
• C) Nylon – ✔ First fully synthetic fibre.
• D) Silk – Natural fibre from silkworms.

Q2. Rayon is also called:

A) Artificial silk
B) Synthetic wool
C) Plastic fibre
D) Polyester

✅ Correct Answer: A) Artificial silk

Explanation:

• A) Artificial silk – ✔ Rayon looks like silk, hence the name.
• B) Synthetic wool – Refers to acrylic.
• C) Plastic fibre – Incorrect.
• D) Polyester – Different synthetic fibre.

Q3. Nylon was first prepared in:

A) India
B) Japan
C) Germany
D) USA

✅ Correct Answer: D) USA

Explanation:

• A) India – Not correct.
• B) Japan – Not correct.
• C) Germany – Not correct.
• D) USA – ✔ Nylon was first made there in 1931.

Q4. Which synthetic fibre is used for making ropes and parachutes?

A) Rayon
B) Nylon
C) Acrylic
D) Polyester

✅ Correct Answer: B) Nylon

Explanation:

• A) Rayon – Not very strong.
• B) Nylon – ✔ Strong, elastic, used in ropes, parachutes.
• C) Acrylic – Used as synthetic wool.
• D) Polyester – Used for clothes and bottles.

Q5. Acrylic is often used as a substitute for:

A) Cotton
B) Silk
C) Wool
D) Nylon

✅ Correct Answer: C) Wool

Explanation:

• A) Cotton – Different fibre.
• B) Silk – Rayon is substitute.
• C) Wool – ✔ Acrylic is artificial wool.
• D) Nylon – Not substitute.

Q6. Which fibre is prepared from wood pulp?

A) Nylon
B) Acrylic
C) Polyester
D) Rayon

✅ Correct Answer: D) Rayon

Explanation:

• A) Nylon – Fully synthetic.
• B) Acrylic – Artificial wool.
• C) Polyester – Synthetic fibre.
• D) Rayon – ✔ Semi-synthetic from wood pulp.

Q7. Which plastic can be softened on heating and moulded repeatedly?

A) Thermoplastics
B) Thermosetting plastics
C) Rayon
D) Nylon

✅ Correct Answer: A) Thermoplastics

Explanation:

• A) Thermoplastics – ✔ Soften on heating, can be reshaped.
• B) Thermosetting plastics – Harden permanently.
• C) Rayon – Fibre, not plastic.
• D) Nylon – Fibre, not thermoplastic.

Q8. Bakelite is an example of:

A) Thermoplastic
B) Thermosetting plastic
C) Synthetic fibre
D) Biodegradable plastic

✅ Correct Answer: B) Thermosetting plastic

Explanation:

• A) Thermoplastic – Can be remoulded.
• B) Thermosetting plastic – ✔ Bakelite once set cannot be remoulded.
• C) Synthetic fibre – Wrong category.
• D) Biodegradable – Bakelite is not biodegradable.

Q9. Which of the following is a thermoplastic?

A) Bakelite
B) Melamine
C) Polythene
D) PVC

✅ Correct Answer: C) Polythene and D) PVC

Explanation:

• A) Bakelite – Thermosetting.
• B) Melamine – Thermosetting.
• C) Polythene – ✔ Thermoplastic.
• D) PVC – ✔ Thermoplastic.

Q10. Melamine is a type of:

A) Thermoplastic
B) Thermosetting plastic
C) Natural fibre
D) Synthetic fibre

✅ Correct Answer: B) Thermosetting plastic

Explanation:

• A) Thermoplastic – Incorrect.
• B) Thermosetting plastic – ✔ Melamine resists fire and heat.
• C) Natural fibre – Not correct.
• D) Synthetic fibre – Not a fibre.

Q11. Which synthetic fibre is used for making PET bottles?

A) Nylon
B) Polyester
C) Acrylic
D) Rayon

✅ Correct Answer: B) Polyester

Explanation:

• A) Nylon – Ropes, parachutes.
• B) Polyester – ✔ Used in PET bottles.
• C) Acrylic – Artificial wool.
• D) Rayon – Semi-synthetic fibre.

Q12. Terylene is a type of:

A) Rayon
B) Nylon
C) Polyester
D) Acrylic

✅ Correct Answer: C) Polyester

Explanation:

• A) Rayon – Semi-synthetic.
• B) Nylon – Polyamide.
• C) Polyester – ✔ Terylene is polyester fibre.
• D) Acrylic – Synthetic wool.

Q13. The strongest synthetic fibre is:

A) Nylon
B) Rayon
C) Polyester
D) Acrylic

✅ Correct Answer: A) Nylon

Explanation:

• A) Nylon – ✔ Very strong, elastic.
• B) Rayon – Not strong.
• C) Polyester – Durable but not as strong.
• D) Acrylic – Less strong.

Q14. Which plastic is used for making non-stick cookware?

A) PVC
B) Bakelite
C) Teflon
D) Melamine

✅ Correct Answer: C) Teflon

Explanation:

• A) PVC – Pipes.
• B) Bakelite – Switches, handles.
• C) Teflon – ✔ Non-stick coating.
• D) Melamine – Heat-resistant crockery.

Q15. Which synthetic fibre resembles silk?

A) Nylon
B) Polyester
C) Acrylic
D) Rayon

✅ Correct Answer: D) Rayon

Explanation:

• A) Nylon – Stronger, used in ropes.
• B) Polyester – Not silky.
• C) Acrylic – Looks like wool.
• D) Rayon – ✔ Called artificial silk.

Q16. Which property of plastic makes it useful for storing food?

A) Good conductor
B) Corrosion resistant
C) Non-reactive
D) Biodegradable

✅ Correct Answer: C) Non-reactive

Explanation:

• A) Good conductor – Wrong (plastics are insulators).
• B) Corrosion resistant – True but not main reason.
• C) Non-reactive – ✔ Don’t react with food.
• D) Biodegradable – Plastics are non-biodegradable.

Q17. Which of the following plastics is used for making electrical switches?

A) PVC
B) Bakelite
C) Melamine
D) Teflon

✅ Correct Answer: B) Bakelite

Explanation:

• A) PVC – Pipes.
• B) Bakelite – ✔ Heat-resistant, insulator → switches.
• C) Melamine – Heat-resistant plates.
• D) Teflon – Non-stick coating.

Q18. Which plastic is used for making pipes?

A) Bakelite
B) PVC
C) Melamine
D) Nylon

✅ Correct Answer: B) PVC

Explanation:

• A) Bakelite – Switches.
• B) PVC – ✔ Polyvinyl chloride used in pipes.
• C) Melamine – Heat-resistant crockery.
• D) Nylon – Ropes, parachutes.

Q19. Which of these is biodegradable?

A) Nylon
B) Polyester
C) Cotton
D) Acrylic

✅ Correct Answer: C) Cotton

Explanation:

• A) Nylon – Non-biodegradable.
• B) Polyester – Non-biodegradable.
• C) Cotton – ✔ Natural fibre, biodegradable.
• D) Acrylic – Non-biodegradable.

Q20. Which plastic is used in making bulletproof material?

A) PVC
B) Teflon
C) Bakelite
D) Polycarbonate

✅ Correct Answer: D) Polycarbonate

Explanation:

• A) PVC – Pipes.
• B) Teflon – Non-stick coating.
• C) Bakelite – Switches.
• D) Polycarbonate – ✔ Used in bulletproof glass.

Q21. Synthetic fibres are also called:

A) Artificial fibres
B) Man-made fibres
C) Natural fibres
D) Plastic fibres

✅ Correct Answer: B) Man-made fibres

Explanation:

• A) Artificial fibres – Partially true.
• B) Man-made fibres – ✔ Correct scientific term.
• C) Natural fibres – From plants/animals.
• D) Plastic fibres – Misleading term.

Q22. Which of these plastics is fire-resistant?

A) Nylon
B) Polyester
C) Melamine
D) PVC

✅ Correct Answer: C) Melamine

Explanation:

• A) Nylon – Catches fire easily.
• B) Polyester – Burns easily.
• C) Melamine – ✔ Fire-resistant plastic.
• D) PVC – Non-reactive, not fireproof.

Q23. Which of the following is NOT a use of plastics?

A) Making ropes
B) Making bottles
C) Making furniture
D) Making oxygen

✅ Correct Answer: D) Making oxygen

Explanation:

• A) Ropes – Nylon ropes.
• B) Bottles – PET bottles.
• C) Furniture – Plastic furniture.
• D) Oxygen – ✔ Not related to plastics.

Q24. Which of these is a disadvantage of synthetic fibres?

A) Wrinkle-free
B) Melt on heating
C) Strong
D) Light weight

✅ Correct Answer: B) Melt on heating

Explanation:

• A) Wrinkle-free – Advantage.
• B) Melt on heating – ✔ Major drawback.
• C) Strong – Advantage.
• D) Light weight – Advantage.

Q25. The main environmental problem with plastics is:

A) Non-reactivity
B) Durability
C) Non-biodegradability
D) Strength

✅ Correct Answer: C) Non-biodegradability

Explanation:

• A) Non-reactivity – Advantage.
• B) Durability – Advantage.
• C) Non-biodegradability – ✔ Causes pollution.
• D) Strength – Advantage.

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