To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?

Related Mcqs:

For a continuous flow type of sedimentation tanks__________________?

A. Width of the tank is normally kept about 6 m B. Length of the tank is normally kept 4 to 5 times the width C. Maximum horizontal flow velocity is limited to 0.3 m/minute 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...

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

A. Degradation B. Active decomposition C. Recovery D. Cleaner water...

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?

A. 1.095 B. 1.085 C. 1.075 D. 1.065...

If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?

A. 1 in 60 B. 1 in 100 C. 1 in 120 D. None of these...