A. H2SO4
B. HNO3
C. HCl
D. None of these
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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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