AIR AROUND US

Major part of the air is constituted by ?

• Nitrogen

• Oxygen

• Carbon dioxide

• Inert gases

What is air ?

• A mixture

• A pure substance

• An element

• Anything , that depends on the place where it is found

Envelope of air that surrounds the earth is known as .

• Biosphere

• Atmosphere

• Environment

• Ecosystem

Which is not a property of air ?

• It occupies space

• It is transparent

• It is a solution

• It is a compound

• Air is everywhere . It is present even in the empty bottle .

• Air does not have any colour and it is transparent .

• Air has weight

• Air occupies space

Contains few gases and fire dust particles .

• Wind

• Vapour

• Atmosphere

• Smoke

Mountaineers carry cylinders with them .

• Carbon Dioxide

• Nitrogen

• Water

• Oxygen

What is the percentage of nitrogen and oxygen in air ?

• 98 %

• 99 %

• 97 %

• 100 %

Which of the following processes need oxygen ?

• Combustion

• Respiration

• Oxidation

• All of Above

When we heat water , we find bubbles coming from it . This shows that -:

• Water contains air

• Air contains water

• Water itself converts into bubbles

• Water contains dissolved minerals