1.
The maximum permissible limit for fluoride in drinking water is

2.
Sludge volume index is defined as the ratio of

3.
The type of sewer which is suitable for both combined and separate system is

4.
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

5.
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

6.
The rate of BOD exerted at any time is

7.
As compared to geometrical increase method of forecasting population, arithmetical increase method gives

8.
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

9.
A pipe which is installed in the house drainage to preserve the water seal of traps is called

10.
The rate of Alteration of pressure filters is

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