Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?

Related Mcqs:

Pick out the correct statement ?

A. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water B. COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time C. COD is related to BOD of a given waste in water but … Pick out the correct statement ?Read More...

Deaeration of high pressure boiler feed water is done to reduce ___________________?

A. Foaming from boilers B. Its dissolved oxygen content C. Its silica content D. Caustic embrittlement...

Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?

A. 84 B. 88 C. 80 D. 92...

The biological decomposition of organic substances in wastes controlled conditions is called_________________?

A. Incineration B. Biological oxidation C. Composting D. None of these...

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

A. Anaerobic B. Saprophytic C. Aerobic D. Parasitic...