Related Questions

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
Pathogens (or pathogenic bacterias) in water may cause
A Typhoid
B Cholera
C Dysentery
D All the above
The electricity bill of a certain establishment is partially fixed and partially varies as the number of units of electricity consumed. Wen in a certain month 540 units are sonsumed. the bill is TK 1800. In another month 620 units are consumed are the bill is Tk 2040. Inayet another month if 500 units are consumed what would be the bill (in Tk) for that month?
A 1950
B 1560
C 1840
D 1680
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
A H2
B CH4
C CO2
D N2
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
A 1
B 100
C Infinite
D Zero
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 concentration
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
A Imhoff tanks
B Trickling filters
C Sludge sedimentation tanks
D None of these
In very first stage of decomposition of the organic matter in sewage
A Nitrites are formed
B Nitrates are formed
C Carbondioxide is formed
D Ammonia is formed
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
A Centrifugal pump
B Pneumatic ejector
C Reciprocating pump
D None of these
Which of the following pumps is used to pump sewage solids with liquid sewage without clogging the pump is?
A Centrifugal pump
B Pneumatic ejector
C Reciprocating pump
D None of these

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