Class XII

One of the statements below is not true for the classification of polymers can be classified on the basis of their
  1. unique mechanical properties
  2. mode of polymerisation
  3. structure of the polymers
  4. resistance to different agents
Intermolecular forces of thermoplastic polymers are
  1. same as elatomers.
  2. more than fibres
  3. between elastomers and fibres
  4. more than elastomers
In vulcanisarion of rubber,
  1. sulphur crosslinks are introduced
  2. None of these
  3. sulphur reacts to form a new compound
  4. sulphur adds new protective layer over rubber
Given the polymers: A = Nylon; B = Buna – S; C = Polythene. Arrange these in decreasing order of their intermolecular forces.
  1. C < A < B
  2. B < C < A
  3. B > C > A
  4. A > B > C
Which of the following is used as for manufacturing conveyor belts, gaskets and hoses.
  1. Buna – N
  2. None of these
  3. Buna – S
  4. Neoprene
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