The incubation period of Typhoid bacillus causing typhoid fever is
A.1 to 3 days
B.3 to 5 days
C.7 to 21 days
D.20 to 30 days
Category: Environmental Engineering Mcqs
The cycle of life, death and decay involving organic nitrogeneous matter is called
A.The sulphur cycle
B.The nitrogen cycle
C.The carbon cycle
D.The hydrological cycle
E.None of the above
Which of the following space needs maximum number of air changes per hour?
A.Assembly halls
B.Restaurants
C.Bed-rooms
D.Class rooms
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
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
