Fresh domestic sewage is _______________ in color?
Fresh domestic sewage is _______________ in color?
A. Grey
B. Dark brown
C. Red
D. Black
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In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
In water treatment, alum [Al2(SO4)3] is used for the process of __________________?A. Filtration
B. Coagulation
C. Sedimentation
D. DisinfectionThe ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?A. Bacterial stability factor
B. Relative stability
C. Biological oxygen demand (BOD)
D. Oxygen ion concentrationOilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtrationA ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?
A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?A. Global warming
B. Green house
C. Atmospheric effect
D. IonosphereOzone is__________________?
Ozone is__________________?A. A primary pollutant
B. A secondary pollutant
C. Impervious to ultra-violet rays
D. Both B. and C.Radioactive solid nuclear wastes are disposed off by _________________?
Radioactive solid nuclear wastes are disposed off by _________________?A. High temperature incineration
B. Pathological incineration
C. Pyrolysis
D. Underground burial in concrete containers