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___________?

Related Mcqs:

The depression of water table in a well due to pumping will be maximum_______________?

A. at a distance R from the well B. close to the well C. at a distance R/2 from the well D. none of the above where R is the radius of influence...

The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?

A. check valve B. sluice valve C. safety valve D. scour valve...

The process of lagooning is primarily a means of________________?

A. reducing the excessive flow in sewers B. disposing of sludge C. increasing the capacity of storage re-servoirs D. increasing flow of sewage through imhoff tanks...

For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?

A. separate system B. combined system C. partially combined system D. partially separate system...

On standard silica scale, the turbidity in drinking water should be limited to_______________?

A. 10 ppm B. 20 ppm C. 30 ppm D. 50 ppm...