51. Which of the following is a thermoplastic polymer?
- a) Bakelite
- b) Melamine
- c) PVC
- d) Vulcanized rubber
Answer: c) PVC
Explanation: PVC (Polyvinyl chloride) is a thermoplastic polymer that can be reshaped when heated and solidified when cooled. It is used in pipes, cables, and flooring.
52. Which polymer is formed by the polymerization of isoprene?
- a) Natural rubber
- b) Polystyrene
- c) Polyvinyl chloride
- d) Nylon-6,6
Answer: a) Natural rubber
Explanation: Natural rubber is a polymer of isoprene. It is an elastomer, which exhibits high elasticity.
53. Which of the following polymers is prepared by addition polymerization?
- a) Polyester
- b) Nylon-6,6
- c) Polystyrene
- d) Bakelite
Answer: c) Polystyrene
Explanation: Polystyrene is an addition polymer formed from the polymerization of styrene monomers.
54. Which polymer is used to make lightweight plastic bags?
- a) Polystyrene
- b) Polyethylene
- c) Nylon
- d) Polypropylene
Answer: b) Polyethylene
Explanation: Polyethylene is commonly used for lightweight plastic bags due to its flexibility and low cost.
55. Which of the following polymers is used to make paints and coatings?
- a) Polyurethane
- b) Polyvinyl chloride
- c) Polystyrene
- d) Polyethylene
Answer: a) Polyurethane
Explanation: Polyurethane is used in making paints, varnishes, and coatings because of its durability and resistance to wear.
56. Which of the following is a copolymer?
- a) Polypropylene
- b) Polystyrene
- c) Nylon-6,6
- d) Bakelite
Answer: c) Nylon-6,6
Explanation: Nylon-6,6 is a copolymer formed from two different monomers: hexamethylene diamine and adipic acid.
57. Which of the following is a synthetic rubber?
- a) Polyvinyl chloride
- b) Buna-S
- c) Polyester
- d) Nylon
Answer: b) Buna-S
Explanation: Buna-S is a synthetic rubber made from the copolymerization of butadiene and styrene. It is widely used in tire manufacturing.
58. The polymerization of which monomer results in Teflon?
- a) Ethylene
- b) Tetrafluoroethylene
- c) Styrene
- d) Vinyl chloride
Answer: b) Tetrafluoroethylene
Explanation: Teflon is a polymer of tetrafluoroethylene, known for its non-stick properties and resistance to heat and chemicals.
59. Which of the following is a step-growth polymer?
- a) Polyethylene
- b) Polyester
- c) Polystyrene
- d) Polyvinyl chloride
Answer: b) Polyester
Explanation: Polyester is a step-growth polymer produced by the condensation reaction between a diacid and a diol, with water as a by-product.
60. Which polymer is produced by the polymerization of acrylonitrile?
- a) Polyethylene
- b) Polyacrylonitrile
- c) Polystyrene
- d) Nylon-6,6
Answer: b) Polyacrylonitrile
Explanation: Polyacrylonitrile (PAN) is produced by the polymerization of acrylonitrile and is used in the manufacture of synthetic fibers.
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