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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Ammonia
Acetylene
Hydrogen
Carbon monoxide

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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.

All of these
Vapor pressure
Dissolved oxygen content
Biological oxygen demand

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Environmental Engineering in CE
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

Skimming mill
Cesspool
Lagoon
Septic tank

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Environmental Engineering in CE
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

100
4000
1000
400

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Environmental Engineering in CE
Iron & manganese present in the polluted water is removed by

Oxidation followed by settling & filtration
Chemical coagulation
Chlorination only
Simple filtration

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Environmental Engineering in CE
Noise level in a quiet private business office is about __________ decibels.

85
70
25
50

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