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Which of the following is not a greenhouse gas ?
Carborundum is a compound of
Hydrogen is not found in atmosphere as
Of all micro-organisms, the most adaptable versatile are
The quality of the musical note depends upon
When a ship enters a sea from a river
Carborundum is another name of
Hydrogen was discovered by .
Of all the gases present in the air, which one of the following is the highest in percentage?
The radiation initially produced in fluorescent tube is
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