Air binding phenomena in rapid sand filters occur due to_________________?

Related Mcqs:

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

A. 1 mg/litre B. 10 mg/litre C. 100 mg/litre D. 1000 mg/litre...

The type of sewer which is suitable for both combined and separate system is_____________?

A. circular sewer B. egg shaped sewer C. horse-shoe type sewer D. semi-elliptical sewer...

The maximum efficiency of BOD removal is achieved in______________?

A. oxidation pond B. oxidation ditch C. aerated lagoons D. trickling filters...

The characteristics of fresh and septic sewage respectively are____________________?

A. acidic and alkaline B. alkaline and acidic C. both acidic D. both alkaline...

Orthotolidine test is used for determination of________________?

A. dissolved oxygen B. residual chlorine C. biochemical oxygen demand D. dose of coagulant...