Synthetic Fibres and Plastics Part 4: MCQs (Q76–Q100)
🧵 Synthetic Fibres and Plastics – MCQs for Class 8 Science
Part 4: Q76 – Q100
Q76. Which of these fibres is NOT synthetic?
A) Nylon
B) Polyester
C) Wool
D) Acrylic
✅ Correct Answer: C) Wool
Explanation:
- A) Nylon – Synthetic.
- B) Polyester – Synthetic.
- C) Wool – ✔ Natural animal fibre.
- D) Acrylic – Synthetic wool.
Q77. Which property makes plastics suitable for storing chemicals?
A) Light weight
B) Non-reactivity
C) Wrinkle-free
D) Transparency
✅ Correct Answer: B) Non-reactivity
Explanation:
- A) Light weight – Useful but not the main reason.
- B) Non-reactivity – ✔ Plastics don’t react with acids, bases.
- C) Wrinkle-free – Property of fibres, not plastics.
- D) Transparency – Only in some plastics.
Q78. Which of these is an example of thermoplastic?
A) Bakelite
B) Melamine
C) PVC
D) Teflon
✅ Correct Answer: C) PVC
Explanation:
- A) Bakelite – Thermosetting.
- B) Melamine – Thermosetting.
- C) PVC – ✔ Thermoplastic.
- D) Teflon – Thermosetting.
Q79. Which fibre is known for its elasticity and strength?
A) Rayon
B) Nylon
C) Acrylic
D) Polyester
✅ Correct Answer: B) Nylon
Explanation:
- A) Rayon – Shiny, but less strong.
- B) Nylon – ✔ Elastic and very strong.
- C) Acrylic – Wool substitute.
- D) Polyester – Durable but not as elastic as nylon.
Q80. Which of these plastics is used in making crockery?
A) PVC
B) Melamine
C) Teflon
D) Bakelite
✅ Correct Answer: B) Melamine
Explanation:
- A) PVC – Pipes.
- B) Melamine – ✔ Heat/fire resistant, used in plates/cups.
- C) Teflon – Non-stick cookware.
- D) Bakelite – Switches.
Q81. The major drawback of plastics is:
A) Light weight
B) Wrinkle resistance
C) Non-biodegradability
D) Strength
✅ Correct Answer: C) Non-biodegradability
Explanation:
- A, B, D – Advantages.
- C) Non-biodegradability – ✔ Causes pollution.
Q82. Which of these plastics is used to make water bottles?
A) Bakelite
B) PET
C) PVC
D) Nylon
✅ Correct Answer: B) PET
Explanation:
- A) Bakelite – Switches.
- B) PET – ✔ Used in bottles, jars.
- C) PVC – Pipes, raincoats.
- D) Nylon – Ropes.
Q83. Which fibre is also called “artificial wool”?
A) Nylon
B) Acrylic
C) Rayon
D) Polyester
✅ Correct Answer: B) Acrylic
Explanation:
- A) Nylon – Strong synthetic fibre.
- B) Acrylic – ✔ Looks like wool, used in sweaters.
- C) Rayon – Artificial silk.
- D) Polyester – Sarees, shirts.
Q84. Which of these plastics is thermosetting?
A) PET
B) Bakelite
C) PVC
D) Polythene
✅ Correct Answer: B) Bakelite
Explanation:
- A) PET – Thermoplastic.
- B) Bakelite – ✔ Thermosetting.
- C) PVC – Thermoplastic.
- D) Polythene – Thermoplastic.
Q85. Which fibre is best suited for sportswear?
A) Cotton
B) Polyester
C) Wool
D) Silk
✅ Correct Answer: B) Polyester
Explanation:
- A) Cotton – Absorbs sweat, dries slowly.
- B) Polyester – ✔ Light, durable, quick-drying.
- C) Wool – Warm, not for sports.
- D) Silk – Expensive, delicate.
Q86. Which fibre is blended with cotton to make T-shirts?
A) Nylon
B) Polyester
C) Acrylic
D) Rayon
✅ Correct Answer: B) Polyester
Explanation:
- A) Nylon – Rarely used in T-shirts.
- B) Polyester – ✔ Blended with cotton for comfort & durability.
- C) Acrylic – Wool substitute.
- D) Rayon – Blended with silk-like fabrics.
Q87. Which plastic is used for coating on non-stick pans?
A) Teflon
B) PVC
C) Bakelite
D) Melamine
✅ Correct Answer: A) Teflon
Explanation:
- A) Teflon – ✔ Heat-resistant, non-stick coating.
- B) PVC – Pipes.
- C) Bakelite – Switches.
- D) Melamine – Crockery.
Q88. Which synthetic fibre is also known as polyesters?
A) Nylon
B) Acrylic
C) Terylene
D) Rayon
✅ Correct Answer: C) Terylene
Explanation:
- A) Nylon – Polyamide.
- B) Acrylic – Wool substitute.
- C) Terylene – ✔ Common polyester fibre.
- D) Rayon – Artificial silk.
Q89. Which property of plastics makes them dangerous when burnt?
A) They emit toxic gases
B) They absorb water
C) They become biodegradable
D) They melt quickly
✅ Correct Answer: A) They emit toxic gases
Explanation:
- A) Toxic gases – ✔ Main danger.
- B) Absorb water – False.
- C) Biodegradable – Opposite is true.
- D) Melt quickly – Property, but not the main danger.
Q90. Which of these is NOT a synthetic fibre?
A) Rayon
B) Nylon
C) Silk
D) Polyester
✅ Correct Answer: C) Silk
Explanation:
- A) Rayon – Semi-synthetic.
- B) Nylon – Synthetic.
- C) Silk – ✔ Natural fibre.
- D) Polyester – Synthetic.
Q91. Which type of plastic cannot be remoulded once set?
A) Thermoplastic
B) Thermosetting plastic
C) PVC
D) PET
✅ Correct Answer: B) Thermosetting plastic
Explanation:
- A) Thermoplastic – Can be reshaped.
- B) Thermosetting plastic – ✔ Permanently hard once set.
- C) PVC, D) PET – Both thermoplastics.
Q92. Which of these is a biodegradable fibre?
A) Nylon
B) Polyester
C) Cotton
D) Acrylic
✅ Correct Answer: C) Cotton
Explanation:
- A, B, D – Synthetic, non-biodegradable.
- C) Cotton – ✔ Natural, biodegradable.
Q93. Which of these plastics is used in making electric plugs and switches?
A) Bakelite
B) PVC
C) Teflon
D) Melamine
✅ Correct Answer: A) Bakelite
Explanation:
- A) Bakelite – ✔ Heat-resistant, insulator.
- B) PVC – Wire covering.
- C) Teflon – Non-stick cookware.
- D) Melamine – Crockery.
Q94. Which of these fibres is water repellent and dries quickly?
A) Polyester
B) Cotton
C) Wool
D) Rayon
✅ Correct Answer: A) Polyester
Explanation:
- A) Polyester – ✔ Dries fast, repels water.
- B) Cotton – Absorbs water.
- C) Wool – Absorbs moisture.
- D) Rayon – Absorbs moisture.
Q95. Which of these plastics is used in making bulletproof glass?
A) PVC
B) Polycarbonate
C) Bakelite
D) Melamine
✅ Correct Answer: B) Polycarbonate
Explanation:
- A) PVC – Pipes.
- B) Polycarbonate – ✔ Strong, impact resistant.
- C) Bakelite – Switches.
- D) Melamine – Crockery.
Q96. Which of these is the main reason for widespread use of plastics?
A) Expensive
B) Non-reactive and durable
C) Biodegradable
D) Heavy
✅ Correct Answer: B) Non-reactive and durable
Explanation:
- A) Expensive – False.
- B) Non-reactive and durable – ✔ Main reason.
- C) Biodegradable – False.
- D) Heavy – Opposite is true (lightweight).
Q97. Which synthetic fibre is used in making ropes for rock climbing?
A) Polyester
B) Nylon
C) Acrylic
D) Rayon
✅ Correct Answer: B) Nylon
Explanation:
- A) Polyester – Clothes.
- B) Nylon – ✔ Strong and elastic, ideal for ropes.
- C) Acrylic – Wool substitute.
- D) Rayon – Artificial silk.
Q98. Which is a common thermoplastic used in toys and pipes?
A) Bakelite
B) Melamine
C) PVC
D) Polyester
✅ Correct Answer: C) PVC
Explanation:
- A) Bakelite – Switches.
- B) Melamine – Crockery.
- C) PVC – ✔ Flexible, used in toys, pipes.
- D) Polyester – Clothes.
Q99. Which of these plastics is fire resistant?
A) Melamine
B) Nylon
C) Polyester
D) PVC
✅ Correct Answer: A) Melamine
Explanation:
- A) Melamine – ✔ Fire-resistant.
- B, C, D – Burn easily.
Q100. Which fibre is called the “wonder fibre of the 20th century”?
A) Polyester
B) Nylon
C) Rayon
D) Acrylic
✅ Correct Answer: B) Nylon
Explanation:
- A) Polyester – Durable but not the wonder fibre.
- B) Nylon – ✔ First fully synthetic fibre, called wonder fibre.
- C) Rayon – Artificial silk.
- D) Acrylic – Artificial wool.
Synthetic Fibres Class 8 MCQs, CBSE Class 8 Science MCQs, NCERT Class 8 Plastics MCQs, Online Learning Science MCQs, Important MCQs Class 8, cbse class 8 science synthetic fibres and plastics mcqs with answers, ncert class 8 synthetic fibres and plastics objective questions, important mcqs for class 8 science synthetic fibres board exams, online learning mcqs for class 8 synthetic fibres and plastics, chapter wise mcqs for class 8 science synthetic fibres and plastics