Which of the following processes is involved in the biochemical treatment of sewage effluents ?

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

A. 5 B. 50 C. 500 D. 5000...

The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?

A. Dissolved oxygen content B. Biological oxygen demand C. Vapor pressure D. All A., B. and C....

Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?

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A. 2 to 4 B. 8 to 12 C. 16 to 20 D. 24 to 32...

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