From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?

Related Mcqs:

Which of the following is not a weightless pollutant ?

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

White smoke coming out of the chimney of a furnace indicates the use of_________________?

A. Low excess air B. Very high excess air C. Gaseous fuel in the furnace D. Liquid fuel in the furnace...

80% less than 200 mesh size particles are called____________________?

A. Smoke B. Powder C. Grit D. Aggregates...

Infective bacteria in water is killed by the _____________ process?

A. Sterilisation B. Aeration C. Disinfection D. None of these...

During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

A. Idle running B. Acceleration C. Cruising D. Deceleration...