Class VIII

A fluid is a substance which can
  1. flow
  2. evaporate
  3. condense
  4. gain heat
A joint which is made between adjoining rails to expand without bending is called
  1. rail joint
  2. sliding joint
  3. expansion joint
  4. contraction joint
Mercury is
  1. harmless
  2. safe
  3. non-toxic
  4. poisonous
Heat which in in form of infra-red waves, emitted in all directions at speed of light is
  1. conduction
  2. convection
  3. radiation
  4. expansion
Heat gain causes a metal to
  1. expand
  2. contract
  3. shrink
  4. stable
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