Our life supports

A disease caused by drinking impure water is

• Typhoid

• Rabies

• Polio

• all of these

_____ is present in maximum percentage in the atmosphere

• Oxygen

• Nitrogen

• Hydrogen

• Carbon dioxide

_______ is used to produce colourful glow in bulbs

• Hydrogen

• Helium

• Argon

• Nitrogen

_____ is the purest form of water

• Tap water

• Pond water

• Distilled water

• Rain water

_______ is the amount of water present in atmoshphere

• Air pressure

• Weather

• Humidity

• Ozone

Changes in the atmosphere takes place in ______ layer of atmoshphere

• Troposhere

• Mesosphere

• Stratosphere

• Exosphere

The process of removing insoluble impurities from water using filter paper

Method of disinfecting water with chlorine _____

• Sedimentation

• Decantation

• Filtration

• Chlorination