A. H2SO4
B. HNO3
C. HCl
D. None of these
Related Mcqs:
- To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Citric acid - In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
A. Nitrites
B. Nitrates
C. Free ammonia
D. Aluminoid nitrogen - 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 - Lead acetate test in sewer manhole is done to test the presence of ____________________?
A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours - 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 - The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________?
A. 1.5
B. 2.0
C. 3.0
D. 4.0 - A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________?
A. 100
B. 1000
C. 5000
D. 10000 - For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
A. 1.5
B. 2.0
C. 2.5
D. 3.0 - The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
A. 1.5
B. 2.0
C. 3.0
D. 4.0 - If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?
A. 50 mg/l
B. 100 mg/l
C. 150 mg/l
D. 250 mg/l
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