Maximum permissible turbidity in potable water is _____________ ppm?
Maximum permissible turbidity in potable water is _____________ ppm?
A. 1
B. 10
C. 250
D. 1000
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Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?
Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?A. CO2
B. SO2
C. Hydrocarbons
D. CFC (chloro fluoro carbon)From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?A. 5
B. 50
C. 500
D. 5000Soluble silica present in boiler feed water can be removed by______________________?
Soluble silica present in boiler feed water can be removed by______________________?A. Coagulation
B. Filtration
C. Anion exchanger
D. Preheating it____________ substances present in sewage are removed in grit chamber during sewage treatment?
____________ substances present in sewage are removed in grit chamber during sewage treatment?A. Organic
B. Fatty
C. Inorganic
D. DissolvedNoise level in a quiet private business office is about _____________ decibels?
Noise level in a quiet private business office is about _____________ decibels?A. 25
B. 50
C. 70
D. 85Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?A. 20
B. 60
C. 90
D. 120