Q.1) The water obtained from…….is generally known as sub-surface water.
A) Rains
B) Rivers
C) Reservoirs
D) Artesian wells
Option (D)
Q.2) The portion of soil through which lateral movement of water takes place is called –
A) Water table
B) An aquiclude
C) Zone of saturation
D) An aquifuge
Option (C)
Q.3) The presence of hydrogen sulphide in water causes –
A) Softening
B) Alkalinity
C) Acidity
D) Bad taste
Option (C)
Q.4) The maximum permissible temperature for domestic supply is –
A) 5 to 10 deg C
B) 10 to 15 deg C
C) 15 to 20 deg C
D) 20 to 25 deg C
Option (B)
Q.5) Low turbidity of water can be determined by –
A) Turbidity tube
B) Jackson’s turbidimeter
C) Bayli’s turbidimeter
D) Hellipe turbidimeter
Option (C)
Q.6) The maximum permissible quantity of iron and manganese in water for domestic purposes should be –
A) 0.1 ppm
B) 0.3 ppm
C) 0.6 ppm
D) 0.8 ppm
Option (B)
Q.7) Sphere shaped bacterias are called :
A) Spirilla
B) Bacilli
C) Cocci
D) Trichobacteria
Option (C)
Q.8) The efficiency of sedimentation tank for a given discharge can be increased by –
A) Increasing the depth of tank
B) Decreasing the depth of tank
C) Increasing the surface area of tank
D) Decreasing the surface area of tank
Option (C)
Q.9) The effective size of sand particles for slow sand filters varies from –
A) 0.30 to 0.35 mm
B) 0.35 to 0.50 mm
C) 0.50 to 0.65 mm
D) 0.65 to 0.75 mm
Option (A)
Q.10) The ideal method of disinfection of swimming pool water is by –
A) Chlorination
B) Lime treatment
C) Ozonisation
D) Ultra-violet rays
Option (C)
Q.11) The amount of chlorine used for plain chlorination of water is about –
A) 0.2 ppm
B) 0.3 ppm
C) 0.4 ppm
D) 0.5 ppm
Option (D)
Q.12) By lime soda process, hardness can be reduced to less than –
A) 50 ppm
B) 75 ppm
C) 100 ppm
D) 150 ppm
Option (A)
Q.13) The plain ends of cast iron pipes are joined by –
A) Spigot and Socket joint
B) Flanged joint
C) Victuallic joint
D) Dresser coupling joint
Option (D)
Q.14) In order to control the flow of water through pipes, a………is provided.
A) Scour valve
B) Air valve
C) Gate valve
D) Safety valve
Option (C)
Q.15) The water from kitchens, bathrooms, wash basins is called –
A) Sewage
B) Sullage
C) Raw sewage
D) None of the above
Option (B)
Q.16) The self-cleaning velocity, recommended for Indian conditions, in order to prevent settling down of sewage at the bottom or on the sides of a large sewer is –
A) 0.25 m/s
B) 0.50 m/s
C) 0.75 m/s
D) 1.50 m/s
Option (C)
Q.17) The water carriage sewage system removes –
A) Domestic sewage
B) Industrial sewage
C) Storm sewage
D) All of the above
Option (D)
Q.18) The internal diameter of the sewer should not be less than –
A) 15 cm
B) 25 cm
C) 50 cm
D) 75 cm
Option (A)
Q.19) For large sewers, the maximum distance between manholes should be –
A) 75 m
B) 150 m
C) 200 m
D) 300 m
Option (D)
Q.20) The bio-chemical treatment of sewage effluent is a process of –
A) Oxidation
B) Deoxidation
C) Self purification
D) Sedimentation
Option (A)
