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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Dose of coagulant
Residual chlorine
Biochemical oxygen demand
Dissolved oxygen

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Environmental Engineering
The working conditions in imhoff tanks are

Aerobic in lower compartment and anaerobic in upper compartment
anaerobic in lower compartment and aerobic in upper compartment
Aerobic only
Anaerobic only

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Environmental Engineering
Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filters The correct answer is

(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)

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Environmental Engineering
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

75
100
50
59

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Environmental Engineering
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

10 mg/liter
1 mg/liter
100 mg/liter
1000 mg/liter

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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

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

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