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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

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

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Environmental Engineering
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

100
1
Zero
Infinite

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Environmental Engineering
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank

(i) and (ii)
(i) and (iii)
Only (i)
Only (iii)

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Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

Anti-siphonage pipe
Soil pipe
Waste pipe
Vent pipe

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Environmental Engineering
Period of cleaning of slow sand filters is about

24 - 48 hours
10 - 12 days
1 - 2 year
2 - 3 months

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Environmental Engineering
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test

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

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