Environmental Engineering In Ce - Study Mode
[#151] A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
Correct Answer
(C) Ozone
[#152] Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
Correct Answer
(A) Neutralised by alkali treatment
[#153] The lowest layer of atmosphere is known as the
Correct Answer
(B) Troposphere
[#154] __________ is the process of killing organism in water.
Correct Answer
(C) Disinfection
[#155] Most of the bacteria in sewage are
Correct Answer
(B) Saprophytic