Air

Air can change the ___________ of the object.

• colour

• shape

The gas released during photosynthesis

• Carbon dioxide

• Nitrogen

• Oxygen

• Helium

What makes air unfit for breathing?

In what direction(s) does air exert pressure?

• everywhere

• in one direction

• downwards only

• upwards only

Look at the picture and guess which propert of Air is shown?

• Air has mass

• Air occupies space

• Air can be heated and cooled

The _______ that takes place in factories, vehicles, kitchens etc. gives out smoke.

• freezing

• burning

Plants use ______________ gas while preparing their food.

• Nitrogen

• Carbon dioxide

Which of these do plants need in order to make food?

• argon
• carbon dioxide
• nitrogen
• oxygen

Air is present in places that appear to be empty.

• True

• False

Aerated drinks have this gas dissolved in it

• Carbon dioxide

• Oxygen

• Nitrogen

• All of the above