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

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

100 ppm
400 ppm
200 ppm
300 ppm

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

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

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

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

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

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Environmental Engineering
As compared to shallow wells, deep wells have

More depth
Less discharge
More discharge
Less depth

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