Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________?

Related Mcqs:

The asbestos cement sewers are_________________?

A. Light in weight B. Not structurally strong to bear large compressive stress C. Susceptible to corrosion by sulphuric acid D. All the above...

The rate of accumulation of sludge in septic tanks is recommended as____________________?

A. 30 litres/person/year B. 25 litres/person/year C. 30 litres/person/month D. 25 litres/person/month...

The screens are fixed___________________?

A. Perpendicular to the direction of flow B. Parallel to the direction of flow C. At an angle 30° to 60° to the direction of flow D. None of these...

The presence of free ammonia in sewage, is detected by___________________?

A. Boiling B. Adding potassium permanganate C. Adding sulphuric acid D. Phenol-di-sulphuric acid...

The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?

A. 100 cm B. 110 cm C. 120 cm D. 150 cm...