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Environmental Engineering in CE

Environmental Engineering in CE
Presence of soluble organics in polluted water causes

Depletion of oxygen
Explosion hazards
Fire hazards
Undesirable plants growth

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Environmental Engineering in CE
Carbonaceous particles having size less than 1 μm are called

Smoke
Aerosols
Aggregates
Grit

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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

Cesspool
Skimming mill
Septic tank
Lagoon

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

None of these
Disinfection
Sterilisation
Aeration

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Powder
Grit
Dust
Smoke

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Environmental Engineering in CE
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

88
84
80
92

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