Air and its Properties

Q. ​Which of the following statements are correct?​

I. Higher the air temperature, higher will be the air pressure.​
II. Higher the air pressure, lower will be the volume of air.​
III. Air speed is higher at lower temperature.

1. I, II, and III​
2. I and II​
3. Only III​
4. II and III​

Q.

Observe the given figure.

What is the purpose of this experiment?

1. air has mass
2. air has oxygen
3. we can only feel air
4. air is compressible

Q.

Why do you think air is transparent?

1. Air traps all the light that falls on it.

2. Air reflects all the light that falls on it.

3. Air allows almost all the light that falls on it to pass through.

4. Constituents of air absorb a significant amount of light rays that fall on them.

Q.

Which of the following is not a property of air?

1. Air occupies space.
2. Air has mass.
3. Air is colourless.
4. Air has taste and odour.

Q. The main constituent in air is _______.

1. oxygen
2. nitrogen
3. sulphur dioxide
4. carbon dioxide

Q. Air is ___.

1. an atom
2. an element
3. a mixture
4. a compound

Q. What is the term used to describe the amount of water vapour present in the air?

1. Density
2. Humidity
3. Mass
4. Volume

Q. Air has mass and occupies space.

1. True
2. False

Q. Air is a mixture of many gases, dust particles and water vapour.

1. True
2. False

Q. Identify the constituents of air.

1. Oxygen
2. Arsenic
3. Nitrogen
4. Sodium
5. Carbon dioxide
6. Water vapours
7. Magnesium
8. Dust
9. Smoke