A. 10 cm
B. 15 cm
C. 20 cm
D. All the above
Related Mcqs:
- The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is__________________?
A. Vs = 418 (Gs – Gw) d [(3T + 70)/100]
B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
D. Vs = 218 (Gs – Gw)d [(3T + 70)/100] - In detritus tanks______________________?
A. Flow velocity is kept 0.09 m/sec
B. Detention period is kept 3 to 4 minutes
C. Organic and inorganic materials are separated
D. All the above - A rainfall may be classified as acidic if its pH value is less or equal to________________?
A. 6
B. 7
C. 5
D. 6.5 - If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
A. D²
B. D²
C. D²
D. D² - The following is the physical characteristic of sewage___________________?
A. Turbidity
B. Colour
C. Odour
D. All the above - 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 - The minimum diameter of a sewer is kept __________________?
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm - pH value of sludge during alkaline regression stage, is__________________?
A. More than 7
B. Less than 7
C. Less than 6
D. More than 6 - Pick up the in-correct statement from the following?
A. Manholes are provided in sewer pipes at suitable intervals
B. Catch basins are generally provided in sewers for carrying drainage discharge
C. Inlets are generally provided in all sewers
D. None of these - For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?
A. 16 m
B. 20 m
C. 24 m
D. 30 m
