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Environmental Engineering in CE

Environmental Engineering in CE
Presence of __________ bacteria in water causes disease like typhoid.

Aerobic
Anaerobic
Pathogenic
Non-pathogenic

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Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Sedimentation
Biological oxidation
Chlorination
Skimming off

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Environmental Engineering in CE
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

Ortho-xylene
Coal ash
Potassium cyanide
None of these

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Turbidity
Dissolved oxygen
Phenol
Silica

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

80
50
25
120

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Environmental Engineering in CE
Presence of high concentration of ozone and smog in atmospheric air causes the

Fading of dye on textiles
Damage of electrical insulator on high tension power line
Embrittlement & decrease of folding resistance of paper
Cracking of rubber products

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