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MCQs

Total Questions : 1113 | Page 8 of 112 pages
Question 71. Commercial production of polypropylene employs __________ polymerisation.
  1.    Emulsion
  2.    Suspension
  3.    Solution
  4.    Bulk
 Discuss Question
Answer: Option C. -> Solution
Question 72. Amino resins are used in paper treatment to improve its
  1.    Wet tear and bursting strength
  2.    Folding endurance
  3.    Wet rub resistance
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 73. Phenol formaldehyde
  1.    Employs addition polymerisation
  2.    Employs condensation polymerisation
  3.    Is a monomer
  4.    Is an abrasive material
 Discuss Question
Answer: Option B. -> Employs condensation polymerisation
Question 74. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to
  1.    Protect rubber goods from attack by oxygen & ozone present in the atmosphere
  2.    Reduce its viscosity to permit easier processing
  3.    Reduce the time of vulcanisation and quantity of vulcanising agent
  4.    Increase its viscosity
 Discuss Question
Answer: Option B. -> Reduce its viscosity to permit easier processing
Question 75. Phthalic anhydride is used
  1.    In making PVC
  2.    As plasticisers
  3.    In insecticides manufacture
  4.    For making nylon-6
 Discuss Question
Answer: Option B. -> As plasticisers
Question 76. Pick out the wrong statement.
  1.    Polymeric fibres are never produced by addition polymerisation
  2.    Property of tackiness is exhibited by uncured rubber
  3.    Sharp melting point is not observed in thermoplastic polymers
  4.    Polythene generally has an excellent resistance to ultra violet rays
 Discuss Question
Answer: Option A. -> Polymeric fibres are never produced by addition polymerisation
Question 77. Polycaprolactum is
  1.    Nylon-6
  2.    Nylon-66
  3.    Dacron
  4.    Rayon
 Discuss Question
Answer: Option A. -> Nylon-6
Question 78. Polycaprolactum is nothing but
  1.    Orlon
  2.    Nylon 6, 6
  3.    Nylon 6
  4.    Saran
 Discuss Question
Answer: Option C. -> Nylon 6
Question 79. Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties.
  1.    Thermoplastic
  2.    Thermosetting
  3.    Elastometric
  4.    Brittleness
 Discuss Question
Answer: Option C. -> Elastometric
Question 80. __________ is produced by polymerisation of chloroprene.
  1.    Thiokol (a polysulphide rubber)
  2.    Butyl rubber
  3.    Neoprene
  4.    Polyurathane rubber
 Discuss Question
Answer: Option C. -> Neoprene

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