air around us

Major part of the air is constituted by

• oxygen

• inter gases

• nitrogen

• carbon dioxide

Wind is -

• air around us

• air in motion

• rising hot air

• none of these

air is present in

• atmosphere

• soil

• water of ponds lakes and seas

• everywhere

air is

• a mixture

• a pure substance

• an element

• anything that depends on the place where it is found

Moving air is called

• dust

• smoke

• wind

• nitrogen

properties of oxygen gas is

• colourless

• tasteless

• odourless

• all of these

The composition of nitrogen gas in the atmosphere is

• 21%

• 78%

• 1%

• 0.01%

Air is considered to be

• a compound

• a mixture

• an element

• a solvent

air is a (a)   of gases

(a)   is the layer of air around the earth