Important Questions Test: Air Around Us - UPSC MCQ

Nitrogen gas comprises 78% of atmosphere. It does not help in respiration, photosynthesis and burning.

The quantity of water vapour present in air is called as humidity.

Quality of air is best in park in comparison to industrial area, busy road crossing and busy market place.

Liquid hydrogen is used for burning fuel in the rockets.

Finer hairs inside the nose filter the dust particle while inhaling the air.

Winnowing is used to separate grains from husk due to difference in their density.

The layer of air around the earth surface is called atmosphere.

Balloons is inflated by air due to pressure of air.

Density of air decrease with height as we move upwards.

Gases and dust particle together make the smoke. Smoke starts from burning substances.

In hospital oxygen gas is used for artificial respiration for patient having respiratory problem.

Atmospheric pressure decrease with height due to decrease in density of air.

The glass which is empty is actually filled with air. And because air takes up space when an empty glass is inverted and inserted into a trough filled with water, the air is trapped within and it is no anyway for air to escape out.

The balance between carbon dioxide and oxygen is maintained by photosynthesis and respiration in which carbon dioxide and oxygen is used and oxygen and carbon dioxide is produced respectively.

All animals including human exhale carbon dioxide gas and inhale oxygen gas.

Nitrogen gas is found in largest quantity in air followed by oxygen gas.

During rain, soil animals come out from their burrows for respiration as their burrow is filled by water.

Animals living in water have gills for respiration which intake oxygen gas dissolved in water.

Air is not required for boiling water but required for inflating tyres, filling balloon and winnowing.

Explanation for the correct option.

1. Dust and fumes make breathing difficult.
2. It causes injuries to our lungs.
3. Smoke and dust also cause cardiovascular health problems.
4. Tiny particles and gases in the smoke can cause inflammation in the eyes and lungs, which can lead to runny nose, bronchitis, or eye irritation.
5. Exposure to high concentrations of these particles can cause persistent coughing, coughing, wheezing, and difficulty breathing.