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

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.