Gases V

This is the most abundant gas in the atmosphere:

• carbon dioxide

• oxygen

• nitrogen

• helium

Plants take in:

• oxygen

• nitrogen

• helium

• carbondioxide

Plants absorb carbondioxide to:

• clean the air

• to reduce global warming

• to provide oxygen

• all of the above

This gas is needed for respiration of humans and animals:

• carbondioxide

• nitrogen

• oxygen

• neon

The gas which supports burning is:

• carbondioxide

• carbon monoxide

• sulphur dioxide

• oxygen

The gas used to fill in air balloons is:

• carbon dioxide

• helium

• nitrogen

• oxygen

The gas used in food packaging is:

• helium

• nitrogen

• oxygen

• carbon dioxide

The gas used to fill in air craft tyres is:

• nitrogen

• carbon dioxide

• oxygen

• helium

The gas filled in fluorescent bulbs is:

• helium

• neon

• argon

• none of them

To produce laser two gases are used:

• helium and neon

• argon and helium

• carbondioxide and oxygen

• none of the above