The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?

Related Mcqs:

1. In very first stage of decomposition of the organic matter in sewage________________?

   A. Nitrites are formed B. Nitrates are formed C. Carbondioxide is formed D. Ammonia is formed...

2. Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?

   A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not a correct explanation of A C. A is true but R is false D. A is false but R is true...

3. The sewer which transports the sewage to the point of treatment, is called________________?

   A. House sewer B. Out-fall sewer C. Branch sewer D. Main sewer...

4. 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...

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

   A. Nitrites B. Nitrates C. Free ammonia D. Aluminoid nitrogen...

6. 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...

7. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?

   A. Bio-Chemical Oxygen Demand (B.O.D.) B. Dissolved Oxygen (D.O.) C. Chemical Oxygen Demand (C.O.D.) D. None of these...

8. In septic tanks, decomposition of organic bacteria, is done by_____________________?

   A. Anaerobic bacteria B. Aerobic bacteria C. Both types of bacterias D. None of these...

9. 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...

10. 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...