21. Which polymer is used in the production of textile fibers?
- a) Polyvinyl chloride
- b) Polytetrafluoroethylene
- c) Nylon-6
- d) Polypropylene
Answer: c) Nylon-6
Explanation: Nylon-6 is commonly used in the production of synthetic fibers for textiles due to its strength, elasticity, and resistance to abrasion.
22. Which of the following is a thermosetting plastic?
- a) Polyethylene
- b) Bakelite
- c) Polypropylene
- d) Polystyrene
Answer: b) Bakelite
Explanation: Bakelite is a thermosetting plastic, meaning once it has been molded and set, it cannot be remelted. It is often used in electrical insulators and kitchenware.
23. Which polymer is formed by the polymerization of caprolactam?
- a) Nylon-6
- b) Nylon-6,6
- c) Kevlar
- d) Dacron
Answer: a) Nylon-6
Explanation: Nylon-6 is formed by the ring-opening polymerization of caprolactam, which results in a linear polyamide used in fibers and plastics.
24. Which type of polymerization involves the loss of small molecules like water or methanol?
- a) Addition polymerization
- b) Condensation polymerization
- c) Free radical polymerization
- d) Chain-growth polymerization
Answer: b) Condensation polymerization
Explanation: Condensation polymerization involves the combination of monomers with the elimination of small molecules like water, methanol, or hydrogen chloride, as seen in the formation of polyamides or polyesters.
25. Which polymer is used for making flexible hoses and insulating cables?
- a) Polyethylene
- b) PVC
- c) Bakelite
- d) Polyester
Answer: b) PVC
Explanation: Polyvinyl chloride (PVC) is used to make flexible hoses, electrical cable insulation, and pipes due to its durability, flexibility, and resistance to environmental degradation.
26. Which of the following is a biopolymer?
- a) Polythene
- b) Polyacrylonitrile
- c) Polylactic acid (PLA)
- d) Polystyrene
Answer: c) Polylactic acid (PLA)
Explanation: Polylactic acid (PLA) is a biopolymer made from renewable resources like corn starch or sugarcane. It is biodegradable and used in packaging and medical implants.
27. Which of the following monomers is used in the manufacture of Teflon?
- a) Vinyl chloride
- b) Ethylene
- c) Tetrafluoroethylene
- d) Propylene
Answer: c) Tetrafluoroethylene
Explanation: Teflon is formed by the polymerization of tetrafluoroethylene. It is known for its non-stick properties and chemical resistance.
28. Which of the following is an example of a homopolymer?
- a) Nylon-6,6
- b) Polyethylene
- c) Styrene-butadiene rubber
- d) Polyester
Answer: b) Polyethylene
Explanation: A homopolymer is made from only one type of monomer. Polyethylene is formed by the polymerization of ethylene monomers, making it a homopolymer.
29. Which of the following is a synthetic fiber?
- a) Silk
- b) Wool
- c) Nylon
- d) Cotton
Answer: c) Nylon
Explanation: Nylon is a synthetic fiber made from polyamides, while silk, wool, and cotton are natural fibers.
30. Which of the following polymers is used to make bulletproof vests?
- a) Nylon-6
- b) Kevlar
- c) Polyethylene
- d) Bakelite
Answer: b) Kevlar
Explanation: Kevlar is a strong, lightweight polymer that has high tensile strength, making it suitable for use in bulletproof vests and other protective gear.
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