100+ Physics Important Question for Air Force - 2

Question: 6

How is air important?

All living beings need air.

Oxygen present in the air is used for breathing.

It is carried in cylinders by mountaineers, deep sea divers and astronauts.

All living beings respire oxygen which burns food molecules and produces energy.

Carbon dioxide is used by plants for the production of food.

Nitrogen is needed for the production of proteins which are essential for the growth of bodies.

Question: 7

What is meant by fixation of nitrogen?

The process of conversion of free atmospheric nitrogen into its soluble compounds is called nitrogen fixation.

There are two types of nitrogen fixation.

They are biological fixation of nitrogen and non biological fixation of nitrogen.

Question: 8

Write any two uses of nitrogen?

All the living beings breathe in and breathe out nitrogen with air. Nitrogen provides unreactive environment.

Nitrogen is used in manufacturing fertilizers.

Question: 9

What is acid rain?

The pollutants like oxides of sulphur and nitrogen readily dissolve in rain water and produce acids. This is called acid rain.

Question: 10

Define air pollution?

Contamination of air with unwanted, harmful gases and smoke is called air pollution.

It causes health problems and affects the environment.