Available Answers

1. 1.

   The temperatures of two bodies differ by 10°C on the Celsius scale. How much will they differ on the (i) Fahrenheit scale, (ii) Kelvin scale?

2. 2.

   Convert 10°C in (a) degree fahrenheit (b) kelvin.

3. 3.

   The normal temperature of human body is 37° C. What will be its value on (a) Fahrenheit scale, (b) Kelvin scale?

4. 4.

   Write true or false for each statement:

   1. On touching lump of ice, we feel cold because some heat passes from our body to the ice.
   2. Heat flows from a body at a high temperature to a body at a low temperature when they are kept in contact.
   3. All solids expand by the same amount when heated to the same rise in temperature.
   4. Telephone wires are kept tight between two poles in summer.
   5. Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
   6. Solids expand the least and gases expand the most on being heated.
   7. A mercury thermometer makes use of the property of expansion of liquids on heating.
   8. Kerosene contracts on heating.
   9. Water is a bad conductor of heat.
   10. Medium is necessary for the transfer of heat by radiation.
   11. Land and sea breezes are convection currents of cold and warm air.
   12. Liquids are heated by conduction and radiation.
   13. Black surfaces are poor absorbers of heat radiations.
5. 5.

   Fill in the blanks:

   1. Heat is a form of ___________.
   2. ___________ determines the degree of hotness or coldness of a body.
   3. On heating a body, its temperature ___________.
   4. We use a ___________ for temperature of a body.
   5. The S.I. unit of temperature is ___________.
   6. In a thermometer, the commonly used liquid is ___________. 
   7. The temperature of a normal human body is ___________ °C.
   8. A person is said to have fever if his body temperature is more than ___________ °F.
   9. A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from
      ___________ to ___________.
   10. The temperature of boiling water is ___________
   11. Liquids expand ___________ than solids.
   12. Gases expand ___________ than liquids.
   13. Heat transfer in solids is by ___________.
   14. Heat transfer in liquids and gases is by ___________ .
   15. Metals are ___________ of heat.
   16. Still air is an ___________ of heat.
   17. Black and dull surface are ___________ of heat.
6. 6.

   Match the following:

   Column A	Column B
   mercury wood  aluminium  contracts black surface	insulator water from 0°C to 4°C  absorbs  conductor thermometer