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CHEMISTRY

Chemistry
The filter over which sewage is sprinkled is called as

Trickling filter
Intermittent sand filter
Contact bed
Percolating filter

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Chemistry
Main source of lead pollution is from

Leaded gasoline
Tobacco
Sewage
Insecticides

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Chemistry
An example of major air pollutant is

Carbon monoxide
Carbon dioxide
Helium
Oxygen

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

Infrared
Ultraviolet
Radio-waves
Visible

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

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

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