Synthetic Fibres and Plastics Part 3: MCQs (Q51–Q75)
🧵 Synthetic Fibres and Plastics – MCQs for Class 8 Science
Part 3: Q51 – Q75
Q51. Which of the following is called a regenerated fibre?
A) Nylon
B) Rayon
C) Acrylic
D) Polyester
✅ Correct Answer: B) Rayon
Explanation:
- A) Nylon – Fully synthetic.
- B) Rayon – ✔ Made from wood pulp → regenerated cellulose fibre.
- C) Acrylic – Synthetic wool.
- D) Polyester – Synthetic fibre.
Q52. Which plastic is often called PVC?
A) Polyvinyl chloride
B) Polyvinyl carbamide
C) Polyvinyl carbonate
D) Polyvinyl cyanide
✅ Correct Answer: A) Polyvinyl chloride
Explanation:
- A) Polyvinyl chloride – ✔ Full form of PVC.
- B, C, D – Incorrect expansions.
Q53. Which synthetic fibre is most commonly used for making sarees and shirts?
A) Rayon
B) Polyester
C) Acrylic
D) Nylon
✅ Correct Answer: B) Polyester
Explanation:
- A) Rayon – Used for dress materials, not very common in shirts.
- B) Polyester – ✔ Popular fabric for clothes.
- C) Acrylic – Substitute for wool.
- D) Nylon – More industrial use.
Q54. Which of these is an advantage of synthetic fibres?
A) Absorb moisture easily
B) Wrinkle easily
C) Quick drying
D) Expensive
✅ Correct Answer: C) Quick drying
Explanation:
- A) Absorb moisture – False, natural fibres do.
- B) Wrinkle easily – Not true, synthetics are wrinkle-free.
- C) Quick drying – ✔ Important advantage.
- D) Expensive – They are cheaper than natural silk/wool.
Q55. Which synthetic fibre is commonly blended with cotton to make fabrics?
A) Nylon
B) Polyester
C) Acrylic
D) Rayon
✅ Correct Answer: B) Polyester
Explanation:
- A) Nylon – Rare in blends with cotton.
- B) Polyester – ✔ Cotton + polyester blend makes durable fabrics.
- C) Acrylic – Used with wool.
- D) Rayon – Blended but less common with cotton.
Q56. Which of the following is NOT a property of synthetic fibres?
A) Lightweight
B) Durable
C) Non-biodegradable
D) Absorb sweat
✅ Correct Answer: D) Absorb sweat
Explanation:
- A) Lightweight – True.
- B) Durable – True.
- C) Non-biodegradable – True (a drawback).
- D) Absorb sweat – ✔ False, synthetics don’t absorb sweat well.
Q57. Which plastic is often used to make water pipes?
A) Nylon
B) PVC
C) Teflon
D) Bakelite
✅ Correct Answer: B) PVC
Explanation:
- A) Nylon – Ropes, parachutes.
- B) PVC – ✔ Durable, flexible → used in pipes.
- C) Teflon – Non-stick cookware.
- D) Bakelite – Switches, handles.
Q58. Which fibre is also called “artificial silk”?
A) Polyester
B) Acrylic
C) Rayon
D) Nylon
✅ Correct Answer: C) Rayon
Explanation:
- A) Polyester – Common for clothes.
- B) Acrylic – Artificial wool.
- C) Rayon – ✔ Shiny, smooth like silk.
- D) Nylon – Strong synthetic fibre.
Q59. Which of these is NOT a thermosetting plastic?
A) Melamine
B) Bakelite
C) PVC
D) Teflon
✅ Correct Answer: C) PVC
Explanation:
- A) Melamine – Thermosetting.
- B) Bakelite – Thermosetting.
- C) PVC – ✔ Thermoplastic.
- D) Teflon – Thermosetting.
Q60. Which synthetic fibre is best for winter wear as substitute for wool?
A) Nylon
B) Acrylic
C) Polyester
D) Rayon
✅ Correct Answer: B) Acrylic
Explanation:
- A) Nylon – Strong but not wool-like.
- B) Acrylic – ✔ Artificial wool, warm and cheap.
- C) Polyester – Common for summer clothes.
- D) Rayon – Shiny like silk, not warm.
Q61. The plastic used in making helmets is:
A) Bakelite
B) Polycarbonate
C) PVC
D) Teflon
✅ Correct Answer: B) Polycarbonate
Explanation:
- A) Bakelite – Switches.
- B) Polycarbonate – ✔ Strong, impact-resistant, used in helmets.
- C) PVC – Pipes.
- D) Teflon – Cookware coating.
Q62. Which fibre is a polyamide?
A) Nylon
B) Acrylic
C) Polyester
D) Rayon
✅ Correct Answer: A) Nylon
Explanation:
- A) Nylon – ✔ Belongs to polyamide group.
- B) Acrylic – Synthetic wool.
- C) Polyester – Polyesters.
- D) Rayon – Semi-synthetic cellulose.
Q63. Which plastic is used for making cooker handles?
A) Teflon
B) Melamine
C) Bakelite
D) PVC
✅ Correct Answer: C) Bakelite
Explanation:
- A) Teflon – Cookware coating.
- B) Melamine – Crockery, fire-resistant.
- C) Bakelite – ✔ Heat-resistant, used in handles.
- D) PVC – Pipes.
Q64. Which is the main disadvantage of synthetic fibres?
A) Wrinkle-free
B) Strong
C) Melt easily on heating
D) Cheaper
✅ Correct Answer: C) Melt easily on heating
Explanation:
- A, B, D – Advantages.
- C) Melt easily – ✔ They stick to the skin when burnt.
Q65. Which synthetic fibre is non-biodegradable?
A) Nylon
B) Acrylic
C) Polyester
D) All of these
✅ Correct Answer: D) All of these
Explanation:
- A) Nylon – Non-biodegradable.
- B) Acrylic – Non-biodegradable.
- C) Polyester – Non-biodegradable.
- D) All of these – ✔ Correct.
Q66. The fibre used in making carpets and blankets is:
A) Polyester
B) Acrylic
C) Rayon
D) Nylon
✅ Correct Answer: B) Acrylic
Explanation:
- A) Polyester – Sarees, shirts.
- B) Acrylic – ✔ Wool-like fibre for blankets/carpets.
- C) Rayon – Dress materials.
- D) Nylon – Industrial uses.
Q67. Which of these is NOT an advantage of plastics?
A) Cheap
B) Durable
C) Biodegradable
D) Light weight
✅ Correct Answer: C) Biodegradable
Explanation:
- A, B, D – True advantages.
- C) Biodegradable – ✔ False; plastics are not biodegradable.
Q68. Which fibre is also called “terylene”?
A) Rayon
B) Polyester
C) Nylon
D) Acrylic
✅ Correct Answer: B) Polyester
Explanation:
- A) Rayon – Artificial silk.
- B) Polyester – ✔ Terylene is a popular polyester fibre.
- C) Nylon – Polyamide.
- D) Acrylic – Artificial wool.
Q69. Which plastic is used in making handles of frying pans?
A) Bakelite
B) Melamine
C) PVC
D) Polyester
✅ Correct Answer: A) Bakelite
Explanation:
- A) Bakelite – ✔ Heat-resistant.
- B) Melamine – Fire-resistant, used in crockery.
- C) PVC – Pipes.
- D) Polyester – Clothes.
Q70. Which is a semi-synthetic fibre?
A) Nylon
B) Rayon
C) Acrylic
D) Polyester
✅ Correct Answer: B) Rayon
Explanation:
- A) Nylon – Fully synthetic.
- B) Rayon – ✔ Derived from cellulose, semi-synthetic.
- C) Acrylic – Synthetic.
- D) Polyester – Synthetic.
Q71. Which plastic is used in making waterproof raincoats?
A) Bakelite
B) PVC
C) Melamine
D) Teflon
✅ Correct Answer: B) PVC
Explanation:
- A) Bakelite – Switches.
- B) PVC – ✔ Flexible and waterproof, used in raincoats.
- C) Melamine – Crockery.
- D) Teflon – Cookware.
Q72. Which fibre is used for making fishing nets?
A) Polyester
B) Nylon
C) Rayon
D) Acrylic
✅ Correct Answer: B) Nylon
Explanation:
- A) Polyester – Clothes.
- B) Nylon – ✔ Strong, elastic, used in fishing nets.
- C) Rayon – Shiny fibre.
- D) Acrylic – Artificial wool.
Q73. Which of the following is used for making plastic bottles?
A) PVC
B) PET
C) Bakelite
D) Nylon
✅ Correct Answer: B) PET
Explanation:
- A) PVC – Pipes.
- B) PET – ✔ Bottles, jars, containers.
- C) Bakelite – Switches.
- D) Nylon – Ropes.
Q74. Which plastic is used in making non-stick coating of utensils?
A) PVC
B) Melamine
C) Teflon
D) Bakelite
✅ Correct Answer: C) Teflon
Explanation:
- A) PVC – Pipes.
- B) Melamine – Fire-resistant crockery.
- C) Teflon – ✔ Non-stick cookware coating.
- D) Bakelite – Switches, handles.
Q75. Which of these plastics is recyclable?
A) Thermosetting plastics
B) Thermoplastics
C) Both A and B
D) None
✅ Correct Answer: B) Thermoplastics
Explanation:
- A) Thermosetting – Cannot be remoulded.
- B) Thermoplastics – ✔ Can be melted and reshaped → recyclable.
- C) Both – Incorrect.
- D) None – Incorrect.
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