Aeration of water is done for all of the following purposes EXCEPT for:
A.removal of bad tastes
B.removal of carbon dioxide
C.increasing the quantity of oxygen in water
D.removal of temporary hardness
Category: Environmental Engineering Mcqs
Turbidity in water is due to
A.Algae
B.Fungi
C.Organic salts
D.Finely divided particles of clay, silt and organic matter
E.None of the above
The maximum permissible turbidity for drinking water
A.Zero
B.1 – 4 ppm
C.15 – 25 ppm
D.3 – 50 ppm
E.30 – 50 ppm
The water borne bacterial infections may cause
A.Typhoid fever
B.Dysentery
C.Cholera
D.Any of the above
E.None of the above
The number of air changes per hour recommended for auditoria is
A.3 to 6
B.6 to 10
C.10 to 12
D.15 to 20
Which of the following is considered as the noble gas?
A.Oxygen
B.Ozone
C.Hydrogen
D.Argon
The process of passing the water through a thick layer of filtering media is known as
A.Sedimentation
B.Filtration
C.Disinfection
D.Purification
E.Putrification
For controlling algae, the chemical generally used is
A.alum
B.lime
C.copper sulphate
D.bleaching powder
Brackish taste of water is due to
A.Chlorides of sodium
B.Fluorides of sodium
C.Turbidity
D.Dead bacteria
E.Any of the above
Disinfection of drinking water means removal of
A.Turbidity
B.Colour
C.Odour
D.Oxygen
E.Bacteria
