Related Questions

Drinking (potable) water treatment does not involve
A Coagulation
B Sedimentation
C Softening
D Disinfection
TLV of mercury in potable (drinking) water is about __________ ppm.
A 0.001
B 0.1
C 1
D 5
For classification of potable (drinking) water, we use a __________ filter.
A Gravity sand
B Plate and frame
C Vacuum leaf
D Rotary vacuum
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
A Dental cavities
B Scale formation
C Water-borne disease
D Corrosion
Potable water means the water used for
A Fire-fighting
B Cooling
C Drinking
D Evaporation to produce steam
The pH value of potable water should be between
A 1 to 1.5
B 6.5 to 8
C 13 to 14
D 4 to 5
Maximum permissible turbidity in potable water is __________ ppm.
A 1
B 10
C 250
D 1000
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

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