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Environmental Engineering

Environmental Engineering
The ratio of 5 day BOD to ultimate BOD is about

43864
1
43894
43833

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Environmental Engineering
As compared to geometrical increase method of forecasting population, arithmetical increase method gives

Lesser value
Same value
Accurate value
Higher value

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Environmental Engineering
Which of the following is not a water borne disease?

Typhoid
Dysentery
Cholera
Malaria

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Environmental Engineering
When there is no recirculation of sewage, then recirculation factor is

None of these
Infinity
1

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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

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

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Environmental Engineering
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

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

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