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CHEMISTRY

Chemistry
The filter over which sewage is sprinkled is called as

Intermittent sand filter
Trickling filter
Contact bed
Percolating filter

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Chemistry
Main source of lead pollution is from

Leaded gasoline
Insecticides
Tobacco
Sewage

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Chemistry
An example of major air pollutant is

Carbon dioxide
Helium
Oxygen
Carbon monoxide

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Chemistry
Which type of radiations are absorbed by the upper layer of the atmosphere?

Ultraviolet
Visible
Infrared
Radio-waves

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Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

More efficient car engines
Catalytic converters in industry
Low - sulphur fuels
Static electricity to attract it in factory chimneys

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