61. Which of the following polymers is commonly used in the production of textiles?
- a) Polyvinyl chloride
- b) Polyethylene
- c) Nylon
- d) Polystyrene
Answer: c) Nylon
Explanation: Nylon is a synthetic fiber used widely in the textile industry due to its strength, durability, and elasticity.
62. Which polymer is used in the production of disposable cups and food containers?
- a) Polyvinyl chloride
- b) Polystyrene
- c) Polypropylene
- d) Polyethylene
Answer: b) Polystyrene
Explanation: Polystyrene is used in the production of disposable cups, plates, and food containers due to its lightweight and rigid properties.
63. Which of the following polymers is used in making fibers for ropes and textiles?
- a) Polypropylene
- b) Polyethylene
- c) Polyester
- d) Polystyrene
Answer: c) Polyester
Explanation: Polyester fibers are widely used in textiles and for making ropes due to their strength, durability, and resistance to shrinkage.
64. Which of the following is a thermosetting polymer?
- a) Polyethylene
- b) Polystyrene
- c) Bakelite
- d) Nylon
Answer: c) Bakelite
Explanation: Bakelite is a thermosetting polymer that hardens permanently after being molded. It is widely used in electrical insulators and kitchenware.
65. Which polymer is used to manufacture water pipes?
- a) Polystyrene
- b) Polyvinyl chloride (PVC)
- c) Nylon-6
- d) Polyethylene
Answer: b) Polyvinyl chloride (PVC)
Explanation: PVC is widely used in the manufacturing of water pipes because of its chemical resistance, durability, and low cost.
66. The polymer used to make parachutes and ropes for mountain climbing is:
- a) Polyethylene
- b) Kevlar
- c) Polypropylene
- d) Bakelite
Answer: b) Kevlar
Explanation: Kevlar is an extremely strong polymer used in making parachutes, ropes for mountain climbing, and bulletproof vests due to its high tensile strength.
67. Which of the following polymers is a biodegradable polymer?
- a) Polyethylene
- b) Polystyrene
- c) Polyhydroxybutyrate (PHB)
- d) Polyvinyl chloride
Answer: c) Polyhydroxybutyrate (PHB)
Explanation: PHB is a biodegradable polymer produced by microorganisms. It is used in medical applications and packaging due to its ability to degrade naturally.
68. Which polymer is used in making non-stick coatings for cookware?
- a) Polypropylene
- b) Polyvinyl chloride
- c) Teflon
- d) Polystyrene
Answer: c) Teflon
Explanation: Teflon is used for non-stick coatings due to its high heat resistance and non-reactive surface, making it ideal for cookware.
69. Which of the following is a characteristic of thermosetting polymers?
- a) They soften on heating.
- b) They can be reshaped repeatedly.
- c) They form extensive cross-links.
- d) They have a linear structure.
Answer: c) They form extensive cross-links.
Explanation: Thermosetting polymers form extensive cross-links when heated, resulting in a rigid structure that cannot be remolded or reshaped after setting.
70. Which of the following is a natural polymer?
- a) Polystyrene
- b) Nylon
- c) Cellulose
- d) Polyethylene
Answer: c) Cellulose
Explanation: Cellulose is a natural polymer found in the cell walls of plants. It is composed of glucose units and is the most abundant organic compound on Earth.
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