71. Which polymer is used to make strong, shatterproof lenses and windows?
- a) Polycarbonate
- b) Polystyrene
- c) Nylon-6
- d) Polyethylene
Answer: a) Polycarbonate
Explanation: Polycarbonate is used to make strong, impact-resistant lenses and windows due to its toughness and transparency.
72. Which of the following is an elastomer?
- a) Polyethylene
- b) Vulcanized rubber
- c) Bakelite
- d) Polystyrene
Answer: b) Vulcanized rubber
Explanation: Vulcanized rubber is an elastomer that has improved elasticity and strength due to the process of vulcanization, where sulfur is added to form cross-links between polymer chains.
73. Which polymer is used for packaging materials due to its flexibility and strength?
- a) Polyethylene
- b) Bakelite
- c) Kevlar
- d) Nylon
Answer: a) Polyethylene
Explanation: Polyethylene is used in packaging materials like plastic bags and bottles because of its flexibility, strength, and resistance to moisture.
74. Which of the following is an example of a condensation polymer?
- a) Polyethylene
- b) Nylon-6
- c) Polypropylene
- d) Polystyrene
Answer: b) Nylon-6
Explanation: Nylon-6 is a condensation polymer formed by the polymerization of caprolactam. Water is released during the polymerization process.
75. Which of the following is a synthetic biodegradable polymer?
- a) Polystyrene
- b) Polypropylene
- c) PHBV (Polyhydroxybutyrate-co-valerate)
- d) Nylon-6,6
Answer: c) PHBV (Polyhydroxybutyrate-co-valerate)
Explanation: PHBV is a biodegradable copolymer, used in packaging and medical implants. It breaks down naturally in the environment.
76. Which polymer is commonly used to make artificial joints and implants?
- a) Polyvinyl chloride
- b) Nylon-6
- c) Teflon
- d) High-density polyethylene (HDPE)
Answer: d) High-density polyethylene (HDPE)
Explanation: HDPE is used in making artificial joints and medical implants due to its strength, chemical resistance, and biocompatibility.
77. Which of the following polymers is formed by addition polymerization?
- a) Nylon-6,6
- b) Bakelite
- c) Polyvinyl chloride
- d) Dacron
Answer: c) Polyvinyl chloride
Explanation: Polyvinyl chloride (PVC) is formed by the addition polymerization of vinyl chloride monomers.
78. Which polymer is used to manufacture lightweight, high-strength materials for aerospace applications?
- a) Polyethylene
- b) Bakelite
- c) Kevlar
- d) Polypropylene
Answer: c) Kevlar
Explanation: Kevlar is used in aerospace applications due to its high tensile strength, lightweight nature, and resistance to heat.
79. Which of the following is a thermoplastic polymer?
- a) Bakelite
- b) Vulcanized rubber
- c) Polystyrene
- d) Epoxy resin
Answer: c) Polystyrene
Explanation: Polystyrene is a thermoplastic polymer that can be softened and reshaped upon heating.
80. Which polymer is formed by the polymerization of butadiene and acrylonitrile?
- a) Neoprene
- b) Buna-N
- c) PVC
- d) Nylon-6
Answer: b) Buna-N
Explanation: Buna-N is a copolymer of butadiene and acrylonitrile, used in making synthetic rubber with good resistance to oil and chemicals.
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