What do we use to store drinking water?
water filter
water cooler
water heater
water tank
Ozone gas is present in the:
exosphere
mesosphere
stratosphere
troposphere
Which gas is added to water to kill bacteria?
hydrogen
chlorine
nitrogen
bromine
Which one of the following do the plants use from air to prepare food?
oxygen
carbondioxide
What is added to the soil by using chemical fertilizers?
argon
What is the process of changing of water or any other liquid to vapour called?
distillation
filtration
condensation
evaporation
As we go up a mountain, air pressure:
decreases
increases
constant
is not there
What is the first layer above the earth's surface?
Troposphere
Stratosphere
Mesosphere
Exosphere
Which of the following is used to inflate footballs and tubes of vehicles?
sand
soil
mud
air
The most important gas for the survival of living beings is: