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MCQs

Total Questions : 515 | Page 48 of 52 pages
Question 471. Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
  1.    resorcinol
  2.    phenol
  3.    para-cresol
  4.    melamine
 Discuss Question
Answer: Option D. -> melamine
Answer: (d).melamine
Question 472. Neoprene is rendered non-inflammable, because of
  1.    its cross-linked structure.
  2.    its linear chain structure.
  3.    the presence of chlorine atoms in its monomer.
  4.    the absence of chlorine atoms in its monomer.
 Discuss Question
Answer: Option C. -> the presence of chlorine atoms in its monomer.
Answer: (c).the presence of chlorine atoms in its monomer.
Question 473. Pick out the wrong statement.
  1.    Polystyrene is a thermoplastic polymer.
  2.    Protein is a natural polymer.
  3.    Neoprene is a natural rubber.
  4.    Polythene is a copolymer, while SBR is a homopolymer.
 Discuss Question
Answer: Option C. -> Neoprene is a natural rubber.
Answer: (c).Neoprene is a natural rubber.
Question 474. Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is
  1.    Ni
  2.    V₂O₅
  3.    Fe
  4.    aluminium triethyl combined with titanium tetrachloride
 Discuss Question
Answer: Option D. -> aluminium triethyl combined with titanium tetrachloride
Answer: (d).aluminium triethyl combined with titanium tetrachloride
Question 475. Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as
  1.    hardeners
  2.    anti-shrinkage agents
  3.    plasticisers
  4.    transparency improver
 Discuss Question
Answer: Option C. -> plasticisers
Answer: (c).plasticisers
Question 476. Which of the following is not the commercial name of polymethylmethacrylate (PMMA) ?
  1.    Perspex
  2.    Lucite
  3.    Plexiglass
  4.    Teflon
 Discuss Question
Answer: Option D. -> Teflon
Answer: (d).Teflon
Question 477. Density of low density polythene is about __________ gm/c.c.
  1.    0.38
  2.    0.56
  3.    0.81
  4.    0.91
 Discuss Question
Answer: Option D. -> 0.91
Answer: (d).0.91
Question 478. In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is
  1.    terylene
  2.    polybutadiene
  3.    PVC
  4.    polypropylene
 Discuss Question
Answer: Option A. -> terylene
Answer: (a).terylene
Question 479. Gutta parcha rubber is
  1.    soft & tacky at room temperature.
  2.    an isomer of natural rubber.
  3.    a thermosetting resin.
  4.    recovered by coagulation of rubber latex.
 Discuss Question
Answer: Option B. -> an isomer of natural rubber.
Answer: (b).an isomer of natural rubber.
Question 480. The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is
  1.    polyvinyl alcohol
  2.    polyvinyl acetale
  3.    polyvinyl butyral
  4.    PVC
 Discuss Question
Answer: Option C. -> polyvinyl butyral
Answer: (c).polyvinyl butyral

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