The algae dies out in the zone of_____________________?

Related Mcqs:

1. 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

2. Operation of McLeod gauge used for low pressure measurement is based on the principle of_____________________?

   A. gas law
   B. Boyle’s law
   C. Charle’s law
   D. Pascal’s law
   E. McLeod’s law

3. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

   A. Degradation
   B. Active decomposition
   C. Recovery
   D. Cleaner water

4. Pick up the correct statement from the following ?

   A. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
   B. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
   C. The minimum design velocity of sewer pipes is taken as 0.8 m/sec
   D. All the above

5. Pick up the incorrect statement from the following ?

   A. Septic tanks are horizontal continuous flow type of sedimentation tanks
   B. Septic tanks are generally provided a detention period of 12 to 36 hours
   C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
   D. None of these

6. 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

7. Ventilating shafts are provided to a sewer line at every__________________?

   A. 100 m
   B. 150 m
   C. 200 m
   D. 300 m

8. The ratio of depths at partial flo________________?

   A. 1 –
   B. 1 –
   C. ½ (1 –
   D. ½ (1 –

9. Dry water flow in a combined sewer, is______________________?

   A. Industrial sewage
   B. Domestic sewage
   C. Storm water
   D. Inclusive of domestic and industrial sewage but excludes storm water

10. The asbestos cement pipes are generally laid___________________?

    A. Horizontally
    B. Vertically
    C. At an angle of 30°
    D. At an angle of 60°