Class VII

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
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
  1. copper bottom makes the pan more durable
  2. such pans appear colourful.
  3. copper is a better conductor of heat than the stainless steel
  4. copper is easier to clean than the stainless steel.
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.
Sea breeze is caused due to
  1. conduction
  2. convection
  3. radiation
  4. all of these
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.
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