Available Answers

1. 1.

   Fill in the blanks.

   1. The increase in the __________ energy appears as heat of the body.
   2. When a substance is cooled, the kinetic energy of its molecules ________.
   3. Brass expands one and half times more than ________.
   4. _________ expansion is the increase in the area of a solid when heat is supplied to it.
   5. If two rods of different lengths of a same metal are taken, then the ________ rod will expand more on heating.
   6. The SI unit of coefficient of thermal expansion is ________.
2. 2.

   State whether the following statements are true (T) or false (F). Correct the False statements.

   1. The transfer of heat continues till the two bodies attain the same temperature.
   2. The boiling point of a liquid increases with the decrease in atmospheric pressure.
   3. The extent of expansion is same in all Solids.
   4. Railway tracks expand in winters and contract in summers.
   5. Greater the area of the exposed surface, faster is the rate of evaporation.
   6. If two cubes of same metal volume are headed, then the cube heated to a highest temperature will show lesser expansion.
3. 3.

   Match the columns.

   Column A	Column B
   1. Linear expansion	a. change in volume on heating
   2. Fusion	b. ∆S = β S ∆ T
   3. Cubical expansion	c. Melting of max
   4. Deposition	d. Snow formation
   5. Superficial expansion	e. Bimetallic strip

    

4. 4.

   Show the process of effects of heat in the form of flowchart.

5. 5.

   Show the processes of change in dimension of solids, liquids and gases in the form of flowcharts.

6. 6.

   Water droplets appear on the outer surface of a glass full of cold water. Give reasons.