Available Answers

1. 1.

   Fill in the blanks:

   1. The matter is made up of ______________.
   2. The state of matter composed of atoms packed tightly together is known as  ______________.
   3. When heat is liberated by matter, the energy of its molecules ______________ and they come closer.
   4. Solids have the ______________ intermolecular space of all the states of matter.
   5. The temperature at which a gas changes into its liquid state is called the  ______________.
2. 2.

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

   1. Even the basic unit of human body, the cell is made up of atoms only.
   2. Liquids have a fixed shape and a definite volume.
   3. When the heat is supplied to the matter, its molecules gain energy and start vibrating vigorously.
   4. During the process of evaporation, the liquids release heat from the body and causes the cooling of the body.
   5. Camphor is an example of sublimate.
3. 3.

   Choose the correct option:

   1. The process that involves the change of state from liquid to its gaseous state at any temperature below its boiling point is called :
   2. The size of the molecules is of the order of :
   3. On cooling down a substance, there is a loss of heat and the kinetic energy of its molecules :
   4. The wetting of the glass is an example of :
   5. During the change of state from solid to liquid :
4. 4.

   Match the columns:

   Column A	Column B
   Definite volume but not fixed shape  Non-rigid molecules  Least intermolecular space  Sublimation  Fusion	Wax  Liquid  Dry ice  Solid Gas

5. 5.

   Why do we smell hot food from a distance? Give reason.

6. 6.

   Why a wooden log cannot be compressed? Give reason.