A. Separation
B. Anaerobic decomposition
C. Aerobic decomposition
D. None of these
Related Mcqs:
- Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
A. Sedimentation tank
B. Circular clarifier
C. Mechanical flocculation
D. Chemical coagulation - ‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ?
A. Dust & mists
B. Smoke & fumes
C. Photochemical smog & soot
D. None of these - Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
A. By chemical coagulation
B. In sedimentation tanks equipped with mechanical scrapper
C. In vacuum filter
D. In clarifiers - In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is_______________?
A. More
B. Less
C. Same
D. Unpredictable; depends on the particular reaction - Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
A. Mercury
B. Lead
C. Fluoride
D. Arsenic - The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
A. 10
B. 200
C. 1000
D. 2000 - TLV of lead for public sewer/waste water is about ______________ ppm?
A. 1
B. 25
C. 150
D. 650 - During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?
A. Filtration
B. Digestion
C. Sedimentation
D. Both B. and C. - Nitrogen oxides (NOx) is not produced in the ______________ industry?
A. Nitric acid making
B. Nitrogenous fertiliser
C. Detergent
D. Any of these - Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?
A. 1
B. 3
C. 7
D. 20
