The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?

Related Mcqs:

The suitable layout of distribution system for a city with roads of rectangular pattern is______________?

A. grid iron system B. dead end system C. ring system D. radial system...

Standard BOD is measured at________________?

A. 20°C – 1day B. 25°C- 3day C. 20°C – 5day D. 30°C- 5day...

Corrosion in concrete sewers is caused by______________?

A. septic conditions B. dissolved oxygen C. chlorine D. nitrogen...

The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?

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

The settling velocity of a particle in a sedimentation tank increases if_________________?

A. particle size is decreased B. the surface area of tank is increased C. the depth of tank is decreased D. none of the above...