Class VII

An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
  1. flow from iron ball to water
  2. not flow from iron ball to water or from water to iron ball.
  3. flow from water to iron ball
  4. increase the temperature of both.
Boiling point of water is
  1. 0° C
  2. 100° C
  3. 357° C
  4. -39°C
Bodies transmitting heat via radiation
  1. do not require any medium
  2. are liquids only
  3. make heat travels in one direction only.
  4. solids only.
A wooden spoon is dipped in a cup of ice cream. Its other end
  1. becomes cold by the process of conduction.
  2. becomes cold by the process of convection
  3. becomes cold by the process of radiation
  4. does not become cold.
One litre of water at 30°C is mixed with one litre of water at 50°C. Thetemperature of the mixture will be
  1. 80°C
  2. more than 50°C but less than 80°C
  3. 20°C
  4. between 30°C and 50°C
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