Related Questions

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
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 septic tanks, decomposition of organic bacteria, is done by
A Anaerobic bacteria
B Aerobic bacteria
C Both types of bacterias
D None of these
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
A Anaerobic
B Saphrophytic
C Aerobic
D Parasitic
The number of bacteria in a colony was growing exponentially . At 1 pm yesterday the number of bacteria was 1000 and at 3 pm yesterday it was 4000. How many bacteria were there in the colony at 6 pm yesterday ?
A 32,000
B 80,000
C 60,072
D 7,683
A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 104, what was the number of bacteria in the population 1 hour later?
A 2(104)
B 6(104)
C (26) (104)
D (106)(104)
It takes 30 days to fill a laboratory dish with bacteria, If the size of the bacteria doubles each days, how long will it take for the bacteria to fill one-----half of the dish?
A 10 days
B 15 days
C 24 days
D 29 days
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
A House sewer
B Lateral sewer
C Main sewer
D Sub-main sewer
The sewer pipe which carries sewage from a building for immediate disposal is
A House sewer
B Lateral sewer
C Intercepting sewer
D Main sewer
The use of coarse screens for the disposal of sewage, may be dispensed with by
A Comminutor
B Shredder
C Both A and B
D Neither A nor B

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