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The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
A Bio-Chemical Oxygen Demand (B.O.D.)
B Dissolved Oxygen (D.O.)
C Chemical Oxygen Demand (C.O.D.)
D None of these
Aerobic bacterias
A Flourish in the presence of free oxygen
B Consume organic matter as their food
C Oxidise organic matter in sewage
D All the above
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
A Ozone and iodine
B Chlorine or its compounds
C Ultraviolet light for irradiation of water
D All of the above
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
A Chlorine
B Alkalis
C Benzene hexachloride
D Alkyl benzene sulphonate (ABS)
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A 0.01 to 0.05 ppm
B 0.05 to 0.5 ppm
C 0.5 to 1.0 ppm
D 1.0 to 5.0 ppm
Pathogenic free living amoeba are
A Acanthamoeba
B Naegleria fowleri
C Entamoeba histolytica
D Balantidium coli
E Entamoeba coli
The pathogens isolated from patients with ventilator associated pneumonia
A Pseudomonas aeruginosa
B Staphylococcus aureus
C Klebsiella spp.
D Herpes simplex virus
E Mycoplasma spp.
The pathogens can be killed by
A Nitrification
B Chlorination
C Oxidation
D None of the above
A sink contains exactly 12 liters of water. If water is drained from the sink until it holds exactly 6 liters of water less than the quantity of water drained away, how many liters of water were drained away ?
A 2
B 3
C 9
D 6
He has no good cause ---- complaint. Darkness was the cause --- his losing his way.
A about--- in
B at--- about
C for -- of
D of--- with

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