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
Category: Environmental Engineering Mcqs
The desirable temperature of portable water is
A.zero degree centigrade
B.10?C
C.20?C
D.27?C
E.37?C
Out of the following diesel engines, the minimum air consumption per BHP will be in
A.4 stroke mechanical injection
B.4 stroke air injection
C.2 stroke mechanical injection pump scavenging
D.2 stroke air injection
Which of the following is the major source of flyash emission?
A.Sintering plants
B.Oil refineries
C.Blast furnace
D.Power plants
E.Sulphuric acid plant
Mycotoxins are poisonous chemicals produced by
A.bacteria
B.virus
C.molds
D.algae
Lead poisoning occurs when the lead content in water is
A.300 – 500 ppm
B.30 – 50 ppm
C.10 – 15 ppm
D.3 – 5 ppm
E.0.3 – 0.5 ppm
Electrodialysis is the process of removal of
A.soluble gases in water
B.dissolved solids in water
C.suspended solids in water
D.none of the above
All of the following give Beta and Gamma radiations EXCEPT:
A.Iridium 192
B.Iodine 131
C.Cobalt 60
D.Polonium 210
When the trees are planted by road side, the average distance between two trees should be
A.2 to 3 metres
B.5 to 8 metres
C.10 to 15 metres
D.25 to 30 metres
Which of the following constituent has highest proportion in atmospheric air?
A.Nitrous oxide
B.Carbon monoxide
C.Helium
D.Neon
