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MCQs

Total Questions : 515 | Page 51 of 52 pages
Question 501. Which of the following is not an elastomer ?
  1.    Polyisoprene
  2.    Neoprene
  3.    Nitrile-butadiene
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Answer: (d).None of these
Question 502. 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.
 Discuss Question
Answer: Option D. -> urea-formaldehyde resins.
Answer: (d).urea-formaldehyde resins.
Question 503. __________ is a copolymer.
  1.    styrene butadiene rubber (SBR)
  2.    Neoprene
  3.    PVC
  4.    None of these
 Discuss Question
Answer: Option A. -> styrene butadiene rubber (SBR)
Answer: (a).styrene butadiene rubber (SBR)
Question 504. Polyvinyl chloride (PVC)
  1.    is produced by polycondensation reaction.
  2.    uses either emulsion or suspension polymerisation methods.
  3.    can be made thermosetting by adding a plasticiser.
  4.    softening temperature is 200°C.
 Discuss Question
Answer: Option B. -> uses either emulsion or suspension polymerisation methods.
Answer: (b).uses either emulsion or suspension polymerisation methods.
Question 505. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
  1.    polymethyl methacrylate (PMMA).
  2.    Polytetraflouroethylene(PTFE).
  3.    polycarbonates.
  4.    phenolic resins.
 Discuss Question
Answer: Option A. -> polymethyl methacrylate (PMMA).
Answer: (a).polymethyl methacrylate (PMMA).
Question 506. Which of the following is not a condensation polymer ?
  1.    Bakelite
  2.    Melamine polymer
  3.    Polymethylmethacrylate (PMMA)
  4.    None of these
 Discuss Question
Answer: Option C. -> Polymethylmethacrylate (PMMA)
Answer: (c).Polymethylmethacrylate (PMMA)
Question 507. Which of the following is the lowest cost plastic commercially available ?
  1.    Polythene
  2.    Teflon
  3.    Bakelite
  4.    PVC
 Discuss Question
Answer: Option A. -> Polythene
Answer: (a).Polythene
Question 508. Terylene is a/an
  1.    addition polymer
  2.    poly amide
  3.    homopolymer
  4.    none of these
 Discuss Question
Answer: Option D. -> none of these
Answer: (d).none of these
Question 509. Rayon is a __________ fibre.
  1.    cellulosic
  2.    polyamide
  3.    polyester
  4.    natural
 Discuss Question
Answer: Option A. -> cellulosic
Answer: (a).cellulosic
Question 510. Thermosetting plastic materials
  1.    can be repeatedly melted.
  2.    is useful for melt casting.
  3.    can not be melted after forming.
  4.    is useful for spinning.
 Discuss Question
Answer: Option C. -> can not be melted after forming.
Answer: (c).can not be melted after forming.

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