Q.1) Pollution potential of domestic sewage generated in a town and its industrial sewage can be compared with reference to :
A) Their BOD value
B) Population equivalent
C) Their volume
D) The relative density
Option (B)
Q.2) For which of the following, distribution mains is designed?
A) Average daily demand
B) Annual peak demand
C) Monthly peak demand
D) Maximum hourly demand on maximum day
Option (D)
Q.3) Which of the following method is used to forecast the population of old and very large city?
A) Arithmetic increase method
B) Geometric progression method
C) Graphical method
D) Logistic curve method
Option (A)
Q.4) The total solids in water are due to presence of :
A) Colloidal and settleable solids
B) Suspended and floating solids
C) Suspended and dissolved solids
D) Colloidal and bacterial load
Option (C)
Q.5) Disinfection of drinking water is done to remove :
A) Turbidity
B) Odour
C) Colour
D) Bacteria
Option (D)
Q.6) Permanent hardness of water can be removed by :
A) Adding alum
B) Adding lime
C) Adding chlorine
D) Zeolite process
Option (D)
Q.7) The permissible limit of arsenic in drinking water as per WHO guidelines :
A) 0.01 ppm
B) 0.05 ppm
C) 0.001 ppm
D) 0.005 ppm
Option (A)
Q.8) Which of the following process includes chlorination of water above breaking point?
A) Plain chlorination
B) Dechlorination
C) Excess chlorination
D) Super chlorination
Option (D)
Q.9) Harmful bacteria, which may be present in sewage, may be –
A) E-coli
B) B-coli
C) Vibrio cholera
D) Entamoeba histolytica
Option (C)
Q.10) Sewage treatment units are normally designed for :
A) 5 – 10 years
B) 15 – 20 years
C) 30 – 40 years
D) 50 years
Option (B)
Q.11) A sewer which receives the discharge of a number of house sewers is called :
A) House sewer
B) Lateral sewer
C) Intercepting sewer
D) Sub-main sewer
Option (B)
Q.12) The standard 5-day BOD at 200C, when compared to ultimate BOD is about :
A) 60%
B) 68%
C) 80%
D) 90%
Option (C)
Q.13) Before entering a manhole a candle is lowered into the manhole –
A) To illuminate it
B) To detect toxic gases
C) To give a signal to the adjacent manhole
D) To find out the presence of oxygen
Option (B)
Q.14) Imhoff cone is used to determine :
A) Dissolved solids
B) Suspended solids
C) Total solids
D) Settleable solids
Option (D)
Q.15) The detention period for oxidation ponds is usually kept as :
A) 4 – 8 hrs
B) 24 hrs
C) 10 – 15 days
D) 3 months
Option (C)
Q.16) The most suitable solid waste disposal method for rural areas is :
A) Land filling
B) Deep well injection
C) Composting
D) Incineration
Option (C)
Q.17) The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is :
A) 1 ppm
B) 4 ppm
C) 10 ppm
D) 40 ppm
Option (B)
Q.18) The global warming is caused mainly by :
A) NOx
B) SOx
C) CO2
D) O2
Option (C)
Q.19) Which of the following are primary air pollutants?
A) Sulphur dioxide and Nitrogen oxides
B) Ozone and Carbon monoxide
C) Sulphur dioxide and Ozone
D) Nitrogen oxide and Ozone
Option (A)
Q.20) The rain is called as acid rain, when its pH is less than……….
A) 3
B) 4.5
C) 7
D) 8.5
Option (B)
