31. Which of the following is a condensation polymer?
- a) Polypropylene
- b) Polyethylene
- c) Dacron
- d) Polystyrene
Answer: c) Dacron
Explanation: Dacron is a polyester formed by condensation polymerization of ethylene glycol and terephthalic acid, with water as the by-product.
32. Which of the following is an example of an elastomer?
- a) Polystyrene
- b) Polyethylene
- c) Buna-N
- d) Bakelite
Answer: c) Buna-N
Explanation: Buna-N is an elastomer made from copolymerization of butadiene and acrylonitrile, commonly used in making rubber materials such as gaskets and seals.
33. The monomer of natural rubber is:
- a) Isoprene
- b) Ethylene
- c) Propylene
- d) Vinyl chloride
Answer: a) Isoprene
Explanation: Natural rubber is a polymer of isoprene (2-methyl-1,3-butadiene), which undergoes polymerization to form long chains of polyisoprene.
34. The polymer commonly used to manufacture non-stick cookware is:
- a) Polyethylene
- b) Polystyrene
- c) Teflon
- d) PVC
Answer: c) Teflon
Explanation: Teflon (polytetrafluoroethylene) is used in non-stick cookware because of its high heat resistance and non-reactive, slippery surface.
35. Which of the following is a synthetic polymer?
- a) Cellulose
- b) Silk
- c) Nylon-6,6
- d) Rubber
Answer: c) Nylon-6,6
Explanation: Nylon-6,6 is a synthetic polymer, produced by condensation polymerization of hexamethylene diamine and adipic acid.
36. Which polymer is formed by the polymerization of ethylene glycol and terephthalic acid?
- a) Nylon-6,6
- b) Dacron
- c) Polyethylene
- d) Polystyrene
Answer: b) Dacron
Explanation: Dacron is a polyester formed by the condensation polymerization of ethylene glycol and terephthalic acid.
37. Which of the following polymers is formed by step-growth polymerization?
- a) Polystyrene
- b) Polyethylene
- c) Nylon-6,6
- d) PVC
Answer: c) Nylon-6,6
Explanation: Nylon-6,6 is produced via step-growth polymerization, involving the combination of hexamethylene diamine and adipic acid.
38. Which of the following is a copolymer?
- a) Polyethylene
- b) Polystyrene
- c) Nylon-6,6
- d) Buna-S
Answer: d) Buna-S
Explanation: Buna-S is a copolymer made from butadiene and styrene, widely used in the rubber industry, especially for tires.
39. Which polymer is used to make PET bottles?
- a) Polyethylene
- b) Polyvinyl chloride
- c) Polyethylene terephthalate
- d) Polystyrene
Answer: c) Polyethylene terephthalate
Explanation: Polyethylene terephthalate (PET) is widely used in making plastic bottles and containers due to its strength and lightweight nature.
40. Which polymer is widely used in electrical insulation?
- a) Bakelite
- b) PVC
- c) Polyethylene
- d) Polystyrene
Answer: b) PVC
Explanation: PVC (Polyvinyl chloride) is commonly used for electrical insulation because of its excellent insulating properties and durability.
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