Polymer Technology

11. _________ is not a polyester fibre.

  1. Terylene
  2. Dacron
  3. Nylon
  4. Polyacrylonitrile

Correct answer: (C)
Nylon

12. _________ is produced by polymerisation of chloroprene.

  1. Thiokol (a polysulphide rubber)
  2. Butyl rubber
  3. Neoprene
  4. Polyurethane rubber

Correct answer: (C)
Neoprene

13. _________ moulding is used for shaping of thermosetting plastics exclusively.

  1. Compression
  2. Injection
  3. Transfer
  4. Extrusion

Correct answer: (C)
Transfer

14. _________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.

  1. Percent elongation
  2. Resilience
  3. Freezing point
  4. Strength

Correct answer: (B)
Resilience

15. _________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.

  1. Fibrous
  2. Leathery
  3. Rubbery
  4. Hard

Correct answer: (B)
Leathery

16. _________ polymer is used for making unbreakable crockery.

  1. Thermoplastic
  2. Melamine
  3. Addition
  4. None of these

Correct answer: (B)
Melamine

17. _________ polythene is most prone to stress-cracking

  1. High density
  2. Low density
  3. Cross-linked
  4. Linear low density

Correct answer: (A)
High density

18. _________ practically possess no elasticity.

  1. Vulcanite or ebonite
  2. Spandex fibre
  3. Polysulphide rubber
  4. Epoxy resin

Correct answer: (A)
Vulcanite or ebonite

19. _________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine.

  1. Epoxy
  2. Amino
  3. Alkyd
  4. Phenolic

Correct answer: (B)
Amino

20. _________ scrap can be recycled & reutilised.

  1. Bakelite
  2. Epoxy resin
  3. Polythene
  4. None of these

Correct answer: (C)
Polythene

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