Which of the following pollutants, if present in atmosphere is detectable by its odour ?

Related Mcqs:

Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

A. Thermosphere B. Troposphere C. Stratosphere D. None of these...

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

A. Coagulation and flocculation of colloids B. Oxidation of carbonaceous matter to CO2 C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate D. All A., B. and C....

Which of the following is not a source of ozone emission in the atmosphere?

A. Refrigerators B. Xerox machines C. Dermatological photo-therapy equipments D. High voltage electrical equipments...

Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?

A. 25 B. 50 C. 80 D. 120...

BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

A. 1-2 B. 5-10 C. 150-300 D. 2000-3000...