Microbiology of Waste Water

 

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Microbiology of Waste Water

Question 1
Which of the following is generally not referred to the sewerage system?
A
Sanitary sewers
B
Storm sewers
C
Combined sewers
D
Solid sewers

Question 2
Which of the following is not employed as an oxidation method?
A
Oxidation ponds
B
Trickling filters
C
Contact aerators
D
All of these

Question 3
Which of the following statement is not correct?
A
The use of 25-40$^\circ$C temperatures allows the biogas production to be more stable
B
The use of 25-40$^\circ$C temperatures does not destroy potentially harmful bacteria
C
The use of 25-40$^circ$C temperatures destroys potentially harmful bacteria
D
None of the above

Question 4
Activated sludge contains large number of
A
bacteria
B
yeasts and molds
C
protozoa
D
all of these

Question 5
A dense bacterial population caught in a tangled web of fibers sticking to a surface describes
A
coagulation
B
a biodisc
C
a biofilm
D
the membrane filter technique

Question 6
The biogas production process takes place at the temperature
A
lesser than 25$^\circ$C
B
25-40$^\circ$C
C
45-60$^\circ$C
D
all of these

Question 7
The death of a river by environmental pollutants ultimately results from
A
the overpopulation of algae
B
the overabundance of toxic proteins
C
the depletion of oxygen
D
the buildup of sediment on the river bottom

Question 8
The acetate-utilizing methanogens are responsible for
A
20 % of methane produced in a biogas reactor
B
50 % of methane produced in a biogas reactor
C
70 % of methane produced in a biogas reactor
D
85 % of methane produced in a biogas reactor

Question 9
Biogas production is
A
a temperature-dependent process
B
a temperature independent process
C
an oxygen dependent process
D
none of the above

Question 10
Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate
A
water rich in organic carbon wastes but poor in phosphate
B
water that are anoxic
C
water rich in phosphate wastes but poor in organic carbon
D
none of the above
There are 10 questions to complete.

 

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