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

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Turbidity is measured on_______________?

A. standard silica scale B. standard cobalt scale C. standard platinum scale D. platinum cobalt scale...

Which of the following sewers is preferred for combined system of sewage ?

A. circular sewer B. egg shaped sewer C. rectangular sewer D. none of the above...

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___________?

A. 100 ppm B. 200 ppm C. 300 ppm D. 400 ppm...

Septic tank is a______________?

1) settling tank 2) digestion tank 3) aeration tank The correct answer is? A. only (1) B. (1) and (2) C. (1) and (3) D. only (3)...

Air binding phenomena in rapid sand filters occur due to_________________?

A. excessive negative head B. mud ball formation C. higher turbidity in the effluent D. low temperature...