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Environmental Engineering

Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.60 to 1.00 mm
1.00 to 1.80 mm
0.25 to 0.35 mm
0.35 to 0.60 mm

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

Higher value
Lesser value
Accurate value
Same value

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Equal to rainfall
Rainfall + DWF
Rainfall + 6 DWF
Rainfall + 2 DWF

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Environmental Engineering
Hardy cross method of analysis of distribution system (i) Involves successive trials (ii) Takes economic aspects into account (iii) Is time consuming

(i) and (ii)
(i) and (iii)
All are correct
Only (i)

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Environmental Engineering
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

10920
10100
9800
9500

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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

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

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