The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
A. 1 ppm
B. 4 ppm
C. 10 ppm
D. 40 ppm
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Dissolved oxygen in streams is______________?
A. Maximum at noon
B. Minimum at noon
C. Maximum at midnight
D. Same throughout the day
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The means of access for inspection and cleaning of sewer line is known as_______________?
A. Inlet
B. Manhole
C. Drop manhole
D. Catch basin
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Sewage treatment units are designed for_______________?
A. Maximum flow only
B. Minimum flow only
C. Average flow only
D. Maximum and minimum flow
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Corrosion in concrete sewers is caused by______________?
A. Septic conditions
B. Dissolved oxygen
C. Chlorine
D. Nitrogen
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Septic tank is a______________?
A. 1) settling tank
B. 2) digestion tank
C. 3) aeration tank
D. The correct answer is?
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Generally the detention period for grit chambers is kept as_______________?
A. 1 minute
B. 5 minutes
C. 2-4 hours
D. 12 hours
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The working conditions in imhoff tanks are_______________?
A. Aerobic only
B. Anaerobic only
C. Aerobic in lower compartment and anaerobic in upper compartment
D. Anaerobic in lower compartment and aerobic in upper compartment
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The detention period for oxidation ponds is usually kept as______________?
A. 4-8 hours
B. 24 hours
C. 10 to 15 days
D. 3 months
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The main disadvantage of oxidation pond is that________________?
A. Large area is required for construction
B. Maintenance and operation cost are high
C. Bod removal is very low
D. None of the above
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Word of the Day
22 Sep
Grim
very serious or gloomy.
کڑا، شدید، سخت،سنگدل

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