The percentage of suspended solid waste in raw water is removed by coagulation is
A. 60
B. 70
C. 80
D. 90
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Chemistry
Which of the following makes the bulk of hydrospheres content?
A. oceans
B. glaciers & icecaps
C. fresh water lakes and ponds
D. All have equal distribution
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Which substance can be used for disinfecting water?
A. KMnO4
B. Alums
C. Ozone
D. All
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The main pollutant of leather tanneries in the waste water is
A. chromium III
B. chromium IV
C. chromium V
D. chromium VI
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Newspaper can be recycled again and again how many times?
A. 2 times
B. 3 times
C. 4 times
D. 5 times
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In the purification of portable water the coagulant used is
A. alum
B. nickel sulphate
C. copper sulphate
D. barium sulphate
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Which statement is wrong about ozone?
A. the amount of ozone layer is greater in the region close to the equator
B. ozone acts as filter for UV radiations
C. in the equatorial region it acts as pollutant
D. CFCs play effective role in removing O3 in the stratosphere
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Which of the following air pollutants is more dangerous for ozone layer?
A. CFC
B. CO2
C. CO
D. Oxides of nitrogen
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In which of the following layer of atmosphere there is more thickness of ozone layer?
A. troposphere
B. stratosphere
C. mesosphere
D. photosphere
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Which of the following is not a condition for the formation of smog ?
A. sufficient NO
B. sunlight
C. less movement of air
D. winds
Which of the following is not a condition for the formation of smog ? Read More »