The bad smell due to decomposition of sewage, on account of the action of bacteria, is mainly due to the presence of
A.Dead bacteria
B.Oxygen
C.Carbondioxide
D.Hydrogen sulphide
E.None of the above
A.Dead bacteria
B.Oxygen
C.Carbondioxide
D.Hydrogen sulphide
E.None of the above
A.zero degree centigrade
B.10?C
C.20?C
D.27?C
E.37?C
A.4 stroke mechanical injection
B.4 stroke air injection
C.2 stroke mechanical injection pump scavenging
D.2 stroke air injection
A.Sintering plants
B.Oil refineries
C.Blast furnace
D.Power plants
E.Sulphuric acid plant
A.bacteria
B.virus
C.molds
D.algae
A.300 – 500 ppm
B.30 – 50 ppm
C.10 – 15 ppm
D.3 – 5 ppm
E.0.3 – 0.5 ppm
A.soluble gases in water
B.dissolved solids in water
C.suspended solids in water
D.none of the above
A.Iridium 192
B.Iodine 131
C.Cobalt 60
D.Polonium 210
A.2 to 3 metres
B.5 to 8 metres
C.10 to 15 metres
D.25 to 30 metres
A.Nitrous oxide
B.Carbon monoxide
C.Helium
D.Neon