In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?

Related Mcqs:

1. For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?

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

2. 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

3. 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

4. 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

5. A well oxidized sewage contains nitrogen mainly as___________________?

   A. Nitrates
   B. Nitrites
   C. Free ammonia
   D. None of these

6. Nitrogen cycle of sewage, is____________________?

   A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
   B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
   C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
   D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

7. If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?

   A. 100 mg/l
   B. 200 mg/l
   C. 300 mg/l
   D. 400 mg/l

8. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?

   A. 0.05552 cumec
   B. 0.05554 cumec
   C. 0.05556 cumec
   D. 0.0556 cumec

9. 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

10. If q is the average sewage flow from a city of population P, the maximum sewage flow______________?

    A. Q = [(4 + )/(18 + )] q
    B. Q = [(18 + P)/(4 + )] q
    C. Q = [(18 + )/(4 + )] q
    D. Q = [(5 + )/((15 + )] q