Class VIII

Cables are kept away from expansion and sagging by giving
  1. rollers
  2. sliding joints
  3. allowance
  4. contraction joint
When substance cool off there is a decrease in
  1. size of substance
  2. vibrations
  3. temperature
  4. all of them
Gain or loss of heat affect state of
  1. matter
  2. conduction
  3. convection
  4. radiation
Railway tracks have gaps between them to deal with expansion in
  1. hot days
  2. cold days
  3. winters
  4. snow fall
Materials trapped air by fur, feathers, wool and sawdust are heat
  1. insulators
  2. conductors
  3. gainers
  4. losers
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