Composition of Air
Composition of Air: Overview
This topic covers concepts, such as, Water Vapour in Air, Condensation, Importance of Inhaling through Nostrils & Air pollution etc.
Important Questions on Composition of Air

Which of the following is not a pollutant?

The gas that does not involve in respiration of humans is_____.

Write two physical properties of nitrogen gas.

The percentage of nitrogen in the air is_____.

The major part of the air which does not support combustion is


If the given pie chart represents the composition of air, which part of the chart represents nitrogen, oxygen and other gases.

Draw any two things that give out smoke. How do you think smoke make affect us?

Fill in the blank to complete the words. Circle them in the word search.
Air is needed to light a F_R_

Why your mother blows a pipe into the firewood stove to burn firewood.

Place a lighted candle on the table-top as shown in the picture. Cover the lighted candle with a glass tumbler. Why is the candle flame put out?

Place a lighted candle on the table-top as shown in the picture. Cover the lighted candle with a glass tumbler. What happens to the candle flame?

Look at the picture. The firewood stove has ember but it is not burning. What trick does your mother use to burn the firewood?


Which of these gases are the most responsible for the cause of air pollution?

Name the gas used by green plants to prepare their food.

The plants take in this gas to prepare food _____.

Organisms living in water use _____(oxygen/carbon dioxide) dissolved in water for respiration.

Carbon dioxide turns lime water to _____(milky/curdy).
