General Science 6th Class Chapter 5 Matter as Particles Solved Exercise

General Science

6th Class

Chapter 5

Matter as Particles

Questions

5.1 Encircle the correct option.

1. There are strong forces of attraction between the particles of:

a. solids        b. liquids        c. gases        d. all of these

2. Solid and liquid objects cannot be compressed easily as their particles are:

a. closely packed        b. loosely packed

c. lacking spaces among them        d. scattered irregularly

3. The process of changing gas into liquid:

a. melting        b. evaporation        c. freezing        d. condensation

4. Changing of substance directly from solid state to gaseous state on heating is termed as:

a. boiling        b. sublimation        c. melting        d. diffusion

5. Materials that don't take the shape of the container:

a. solids        b. liquids        c. gases        d. all of these

6. When a gas condenses, it becomes a:

a. solid        b. liquid        c. crystal        d. another gas

7. When a solid object is heated, its particles begin to:

a. vibrate fast        b. vibrate slowly        c. stop vibrating        d. move freely

8. Boiling point of water is:

a. 0˚ C       b. 0˚ F        c. 100˚ C        d. 100˚ F

9. Movement of particles from an area where they are more to an area where they are less:

a. boiling        b. evaporation        c. diffusion        d. sublimation

10. Which of the following is opposite to boiling?

a. evaporation        b. freezing        c. melting        d. condensation

5.2 Give short answers.

1. How can we change the physical state of matter?

Ans.

Physical state of matter can be changed by the processes of melting, boiling, condensation and freezing.

2. How do liquids differ from gases?

Ans.

Liquids differ from gases as in liquids, the particles are present very close to one another and have attractive forces among them. In gases, particles are away from each other and have almost no attractive forces present among them.

3. How do solids differ from liquids with regard to particles arrangement?

Ans.

In solids, particles have an orderly arrangement where they are present tightly packed with each other, while in liquids, the particles are present very close to one another but they are not regularly arranged.

4. A liquid on cooling is converted into its solid state. What will happen to a solid when it is cooled?

Ans.

Cooling a solid decreases the motion of its particles. A decrease in motion of particles allow the attraction between the particles to bring them a more close together.

5. Write down the names of five liquids and five gases which you know.

Ans.

Liquids: Water, Milk, Blood, Gasoline, Mercury.

Gases: Natural gas, oxygen, nitrogen, Helium, carbon dioxide.