Polymer Technology

21. _________ tubes are good substitute for human blood vessels on heart by-pass operation.

  1. PVC
  2. Polythene
  3. Teflon/Dacron
  4. Polystyrene

Correct answer: (C)
Teflon/Dacron

22. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of _________ °C.

  1. -5
  2. 11232
  3. 250-280
  4. 500-600

Correct answer: (C)
250-280

23. A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of

  1. Siloxane elastomers
  2. Polyamides
  3. Vinyl polymers
  4. Urea-formaldehyde resins

Correct answer: (D)
Urea-formaldehyde resins

24. 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

Correct answer: (A)
In a chain without the elimination of water

25. A copolymer of vinyl and vinylidene chloride is called

  1. Treylene
  2. Orlon
  3. Saran
  4. Dacron

Correct answer: (C)
Saran

26. Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but

  1. Polyacrylonitrile
  2. Polyamide
  3. Saturated polyester
  4. Alkyd resin

Correct answer: (A)
Polyacrylonitrile

27. Acrylonitrile is mainly used in the _________ industry.

  1. Polymer
  2. Printing
  3. Dyeing
  4. Photographic

Correct answer: (A)
Polymer

28. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styreneacrylonitrile copolymer with butadiene based elastomer, is a/an

  1. Rigid foam
  2. Engineering plastic
  3. Thermosetting polymer
  4. Spongy rubber

Correct answer: (B)
Engineering plastic

29. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its

  1. Tensile strength
  2. Chemical resistance
  3. Flexibility
  4. All (A), (B) & (C)

Correct answer: (C)
Flexibility

30. Addition of stabiliser during PVC manufacture is done to

  1. Improve its impact strength
  2. Improve its elasticity
  3. Reduce the melt viscosity & glass transition temperature
  4. Prevent its thermal degradation

Correct answer: (D)
Prevent its thermal degradation

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