Which is needed by human body to carry out life processes?
Food
Water
Pressure
Gravity
The layer of the atmosphere in which we live is the :
Troposphere
Stratosphere
Mesosphere
Thermosphere
The atmosphere is thicker and heavier near the :
Ground
Under ground
Space
Which is the uppermost layer of the atmosphere?
Exosphere
In how many forms is water present in nature?
1
2
3
4
Which gas present in the atmosphere helps plants to prepare their food?
Nitrogen
Hydrogen
Carbon dioxide
Oxygen
How long should water be boiled to kill germs?
3 minutes
5 minutes
8 minutes
10 minutes
Jet aircrafts fly in the :
The process by which the impurities in the water gets settle down is called:
Sedimentation
Decantation
Distillation
Filtration
Which is the first layer of the atmosphere?
