Air around Us

Which of these is true about Air?

• It has colour

• It is all around us

• It can be measured in a cup

• You can wrap it around you like a blanket

Q. 

Major part of the air is constituted by ?

• Nitrogen

• oxygen

• carbon

• hydrogen

During photosynthesis, plants take in

• oxygen

• nitrogen

• Carbon dioxide

• Carbon monoxide

Q. 

Envelope of air that surrounds the earth is known as ________

• biosphere

• atmosphere

• hydrospere

 

Mountaineers carry ______ cylinders with them .

• carbon dioxide

• oxygen

• hydrogen

• nitrogen

Take an empty glass bottle. Turn it upside down. Now ,dip the open mouth of the bottle into a bucket filled with water. now , tilt the bottle slightly. you can see air bubbles in the water. what can we infer from this?

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

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

• air has mass

fire needs ______ to burn

• carbon dioxide

• oxygen

• nitrogen

• carbon monoxide

What is the percentage of nitrogen and oxygen in air ?

• 98 %

• 99 %

• 97 %

• 100 %

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

What is a Wind vane used for?

• Helps the wind to flow

• Makes the air clean

• To show the direction of wind

• Creates wind