Air and Water

What is the percentage of Oxygen in air?

• 70%

• 21%

• 20%

• 78%

Which property of air does this image represent?

• Air is required for burning.

• Air occupies space

• Air is essential for living

• Air can burn

The layer of atmosphere in which space shuttles orbit is called ______________.

• exosphere

• thermosphere

• stratosphere

• troposphere

State whether True or False: “Filtration is a method of removing insoluble impurities.”

• True

• False

In which layer of the atmosphere is the ozone layer situated?

• Troposphere

• Mesosphere

• Stratosphere

• Thermosphere

Which is not a way in which air pressure helps us?

• Pumping of water through a hand pump

• Filling ink in a fountain pen

• Flying kites

• Drinking water

Smog is a mixture of smoke and fog.

• True

• False

We do not sweat when it is humid.

• True

• False

The method of changing a liquid into its vapours and then condensing the vapours to get the pure form of that liquid is called ________________.

• condensation

• distillation

• evaporation

• boiling

What is an essential nutrient for plants?

• Nitrogen

• Hydrogen

• Calcium

• Phosphorous