Which of the following unit works in anaerobic conditions ?

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Residual chlorine in water is determined by________________?

A. starch iodide method B. orthotolidine method C. both (A) and (B) D. none of the above...

The design discharge for the separate sewer system shall be taken as_____________?

A. equal to dry weather flow (DWF) B. 2xDWF C. 3 x DWF D. 6xDWF...

The working conditions in imhoff tanks are_______________?

A. aerobic only B. anaerobic only C. aerobic in lower compartment and anaerobic in upper compartment D. anaerobic in lower compartment and aerobic in upper compartment...

In lime-soda process________________?

A. only carbonate hardness is removed B. only non-carbonate hardness is re-moved C. lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness D. lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness...

The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?

A. arithmetical increase method B. geometrical increase method C. incremental increase method D. graphical method...