Available Answers

1. 1.

   Choose and write the correct answer(MCQs):

   1. Which of these are the best conductor of heat?
      1. water
      2. zinc
      3. alcohol
      4. hydrogen
   2. Which of these are the best insulator of heat?
      1. water
      2. zinc
      3. alcohol
      4. hydrogen
   3. Land and sea breezes occur due to:
      1. conduction
      2. convection
      3. radiation
      4. none of these
   4. The specific heat capacity of a substance depends on:
      1. its volume
      2. its temperature
      3. its mass
      4. its material
2. 2.

   Write T for true or F for false:

   1. Liquids expand uniformly with increase in temperature.
   2. Heat capacity and specific heat capacity are the same.
   3. When the temperature rises, the attraction between molecules increases.
   4. A medium is necessary for transfer of heat by radiation.
   5. All cold bodies radiate heat.
   6. Water is a bad conductor of heat.
   7. One calorie is nearly equal to 4.2 joules.
   8. Solids heated mainly by conduction.
   9. A thermos flask can keep hot liquids hot for several hours.
3. 3.

   Why are gaps left between lengths for railway track?
4. 4.

   Distinguish between heat capacity and specific heat capacity.
5. 5.

   Define conduction. What are the essential conditions for the conduction of heat?
6. 6.

   What are good and bad conductors of heat? Why are the handles of cooking utensils made of insulators?