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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1,00,000
1000
4,00,000
4000

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Environmental Engineering
The detention period for oxidation ponds is usually kept as

48 hours
10 to 15 days
3 months
24 hours

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank increases if

The depth of tank is decreased
The surface area of tank is increased
None of these
Particle size is decreased

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Environmental Engineering
The maximum permissible limit for fluoride in drinking water is

0.1 mg/liter
1.5 mg/liter
5 mg/liter
10 mg/liter

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

500 to 750 liters/hour/ m²
1250 to 1500 liters/hour/m²
1000 to 1250 liters/hour/ m²
1500 to 2000 liters/hour/m²

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Environmental Engineering
The per capital consumption of a locality is affected by (i) Climatic conditions (ii) Quality of water (iii) Distribution pressure

Both (i) and (ii)
All (i), (ii) and (iii)
Only (i)
Both (i) and (iii)

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