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Total Questions : 1113 | Page 17 of 112 pages
Question 161. Viscosity of a polymer solution or melt
  1.    Decreases with increase in molecular weight
  2.    Decreases with increase in temperature
  3.    Increases with increase in temperature
  4.    Does not vary with temperature rise
 Discuss Question
Answer: Option C. -> Increases with increase in temperature
Question 162. __________ polythene is most prone to stress-cracking
  1.    High density
  2.    Low density
  3.    Cross-linked
  4.    Linear low density
 Discuss Question
Answer: Option A. -> High density
Question 163. __________ is not a polyester fibre.
  1.    Terylene
  2.    Dacron
  3.    Nylon
  4.    Polyacrylonitrite
 Discuss Question
Answer: Option C. -> Nylon
Question 164. The starting material used for the manufacture of caprolactum is
  1.    Ethyl benzene
  2.    Cyclohexane
  3.    Ethylene glycol
  4.    DMT
 Discuss Question
Answer: Option B. -> Cyclohexane
Question 165. Contact lenses for eyes are made of perspex, which is nothing but
  1.    Polymethylmethacrylate
  2.    Polystyrene
  3.    Unsaturated polyester
  4.    Polypropylene
 Discuss Question
Answer: Option A. -> Polymethylmethacrylate
Question 166. Most commonly used rubber vulcanisation agent is
  1.    Sulphur
  2.    Bromine
  3.    Platinum
  4.    Alumina
 Discuss Question
Answer: Option A. -> Sulphur
Question 167. Most of the plastics are safe to be used upto a maximum temperature of __________ °C.
  1.    100
  2.    150
  3.    350
  4.    450
 Discuss Question
Answer: Option B. -> 150
Question 168. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
  1.    -5
  2.    10-30
  3.    250-280
  4.    500-600
 Discuss Question
Answer: Option C. -> 250-280
Question 169. Hot drink (e.g, tea) cups are usually made of
  1.    Polystyrene
  2.    Polythene
  3.    Polypropylene
  4.    PVC
 Discuss Question
Answer: Option A. -> Polystyrene
Question 170. A copolymer is formed by the combination of two or more monomer molecules
  1.    In a chain without the elimination of water
  2.    With the elimination of small amount of water
  3.    Of the same monomer by elimination of small molecules of water
  4.    None of these
 Discuss Question
Answer: Option A. -> In a chain without the elimination of water

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