The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?

Related Mcqs:

Which of the following is not a weightless pollutant ?

A. SPM B. Thermal pollution C. Radioactive rays D. Noise pollution...

Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?

A. Thermal power plant B. Petroleum refinery C. Nitric acid plant D. Sulphuric acid plant...

Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?

A. Automobile exhaust B. Flue gas of coal based power plant C. Exhaust of nitric acid plant D. Exhaust of sulphuric acid plant...

The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?

A. 10 B. 200 C. 1000 D. 2000...

Pick out the wrong statement ?

A. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines C. Temperature in stratosphere rises with increasing altitude D. The characteristic of a green … Pick out the wrong statement ?Read More...