The gas evolved in sewers is________________?
The gas evolved in sewers is________________?
A. Carbondioxide
B. Hydrogen sulphide
C. Methane
D. All of these
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The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?A. 1 mm
B. 5 mm
C. 10 mm
D. 20 mm
E. 30 mmSpecific weight of sea water is more that of pure water because it contains ________________?
Specific weight of sea water is more that of pure water because it contains ________________?A. dissolved air
B. dissolved salt
C. suspended matter
D. all of the above
E. heavy waterThe width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?A. 5 m
B. 5.5 m
C. 6.5 m
D. 7 mFor large sewers, maximum distance between manholes may be_______________?
For large sewers, maximum distance between manholes may be_______________?A. 50 m
B. 100 m
C. 200 m
D. 300 mThe sewage is pumped up_______________?
The sewage is pumped up_______________?A. From low lying areas
B. From flat areas
C. From basements
D. All the aboveThe recommended detention period for grit chambers is_______________?
The recommended detention period for grit chambers is_______________?A. 1 minute
B. 2 minutes
C. 3 minutes
D. 5 minutes