Polymer Technology

91. In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for _________ fibres.

  1. Polythene
  2. PVC
  3. Rayon
  4. Polyvinyl acetate

Correct answer: (B)
PVC

92. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the _________ fibres.

  1. Viscose rayon
  2. Acrylic
  3. Polyvinyl acetate
  4. Saturated polyester

Correct answer: (D)
Saturated polyester

93. In condensation polymerisation as compared to addition polymerisation

  1. The monomers are unsaturated compounds
  2. No co-product is lost
  3. The monomers contain two functional groups
  4. Generally only one monomer is involved

Correct answer: (C)
The monomers contain two functional groups

94. In nylon-6, the number 6 represents the total number of

  1. Carbon atoms in the ring
  2. Carbon atoms in the linear polymer chain
  3. Nitrogen atoms in the ring
  4. Hydrogen atoms in the ring

Correct answer: (B)
Carbon atoms in the linear polymer chain

95. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the

  1. Hexamethylene diamine and the ring
  2. Hexamethylene diamine and the adipic acid
  3. Adipic acid and the ring
  4. None of these

Correct answer: (B)
Hexamethylene diamine and the adipic acid

96. 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

Correct answer: (A)
Terylene

97. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of

  1. Cross linked polystyrene
  2. Phenol formaldehyde resins
  3. Polyesters
  4. Polyamides

Correct answer: (A)
Cross linked polystyrene

98. Ion exchange resins are made of

  1. Lucite
  2. Sulphonated Bakelite
  3. Polystyrene
  4. Teflon

Correct answer: (B)
Sulphonated Bakelite

99. Lavatory cisterns are normally made of

  1. Expanded polystyrene
  2. Saturated polyester
  3. Perspex
  4. PVC

Correct answer: (A)
Expanded polystyrene

100. Linear polymers are normally

  1. Thermosetting
  2. Thermoplastic
  3. Elastometric
  4. Having extremely high softening point

Correct answer: (B)
Thermoplastic

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