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Environmental Engineering in CE

Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

1
7
20
3

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Environmental Engineering in CE
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

Mercury
Arsenic
Lead
Fluoride

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Environmental Engineering in CE
Pick out the wrong statement pertaining to 'green house' for the plants.

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Keeping the pH value of feed water just below 7
Reduction in hardness, silica & alumina in feed water
Eliminating H₂S in feed water
Preheating of feed water

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Environmental Engineering in CE
Pollution by particulate matter emission in the atmosphere does not take place during metal

Polishing
Cutting
Machining
Grinding

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Environmental Engineering in CE
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

Dissolved oxygen content
Vapor pressure
Biological oxygen demand
All of these

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