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MCQs

Total Questions : 1113 | Page 2 of 112 pages
Question 11. Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?
  1.    Ethylene glycol
  2.    Stearic acid estors
  3.    Tricresyl phosphate
  4.    Esters of phthalic acid
 Discuss Question
Answer: Option A. -> Ethylene glycol
Question 12. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
  1.    Glycerol
  2.    Nitro cellulose
  3.    Camphor
  4.    None of these
 Discuss Question
Answer: Option C. -> Camphor
Question 13. Nylon-66 compared to nylon-6 has
  1.    Lower melting point
  2.    More abrasion resistant properties
  3.    Higher hardness
  4.    All of the above
 Discuss Question
Answer: Option C. -> Higher hardness
Question 14. Which of the following is not a natural fibre?
  1.    Silk
  2.    Viscose rayon
  3.    Wool
  4.    Cotton
 Discuss Question
Answer: Option B. -> Viscose rayon
Question 15. __________ tubes are good substitude for human blood vessels onrheart by-pass operation.
  1.    PVC
  2.    Polythene
  3.    Teflon/dacron
  4.    Polystyrene
 Discuss Question
Answer: Option C. -> Teflon/dacron
Question 16. Polycaprolactum is also known as
  1.    Nylon-66
  2.    Nylon-6
  3.    Teflon
  4.    SBR
 Discuss Question
Answer: Option B. -> Nylon-6
Question 17. Which of the following low molecular weight (
  1.    Cellulose acetate
  2.    Polyvinyl acetate
  3.    Thiokol
  4.    PVC
 Discuss Question
Answer: Option B. -> Polyvinyl acetate
Question 18. Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent.
  1.    50
  2.    75
  3.    90
  4.    99
 Discuss Question
Answer: Option C. -> 90
Question 19. Unbreakable crockeries are made from __________ polymers.
  1.    Polystyrene
  2.    Melamine
  3.    Polystyrene
  4.    Polyurathane
 Discuss Question
Answer: Option B. -> Melamine
Question 20. Polypropylene is preferred to polythene, because the former is
  1.    Non-inflammable
  2.    Harder
  3.    Stronger
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C

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