Q.1) The water obtained from the tube wells is known as :
A) Surface water
B) Sub-surface water
C) Run-off
D) Potable water
Option (B)
Q.2) A pipe sunk into the ground to tap the underground water is called –
A) Open well
B) Tube well
C) Artesian well
D) Infiltration well
Option (B)
Q.3) The continuous flow of water may be expected from –
A) Surface springs
B) Artesian springs
C) Gravity springs
D) All of the above
Option (B)
Q.4) Run-off is the water which flows :
A) In infiltration galleries
B) In sewer pipes
C) Due to leakage of pipes
D) In rivers
Option (D)
Q.5) The growth of population may be conveniently represented by –
A) Semi-logarithmic curve
B) Logistic curve
C) Straight line curve
D) All of the above
Option (B)
Q.6) In India, as per Indian Standards, water consumption per capita per day for domestic purpose is :
A) 85 litres
B) 100 litres
C) 115 litres
D) 135 litres
Option (D)
Q.7) The design period for a water supply project is taken as –
A) 5 to 10 years
B) 10 to 15 years
C) 15 to 20 years
D) 20 to 30 years
Option (D)
Q.8) For large cities, the suitable method for forecasting population is –
A) Arithmetical increase method
B) Graphical method
C) Geometrical increase method
D) Comparative method
Option (A)
Q.9) The presence of bacteria in water causes :
A) Hardness
B) Alkalinity
C) Diseases
D) Bad taste
Option (C)
Q.10) The presence of sodium chloride in water –
A) Causes bad taste
B) Softens the water
C) Increases hardness of water
D) Stops epidemic
Option (B)
Q.11) The maximum permissible color for domestic supplies, on platinum cobalt scale is :
A) 5 to 10 ppm
B) 10 to 20 ppm
C) 20 to 30 ppm
D) 30 to 40 ppm
Option (B)
Q.12) High turbidity of water can be determined by –
A) Turbidity tube
B) Jackson’s turbidimeter
C) Bayli’s turbidimeter
D) Hellipe turbidimeter
Option (B)
Q.13) The maximum permissible total solid content in water for domestic purposes should not exceed :
A) 300 ppm
B) 400 ppm
C) 500 ppm
D) 1000 ppm
Option (C)
Q.14) The most common cause of acidity in water is :
A) Hydrogen
B) Nitrogen
C) Carbon dioxide
D) Oxygen
Option (C)
Q.15) The maximum permissible chlorine content for public supplies should be between –
A) 0.1 to 0.2 ppm
B) 0.3 to 0.4 ppm
C) 1.2 to 4 ppm
D) 6.5 to 8 ppm
Option (A)
Q.16) B-coli or E-coli are harmless organisms but their presence in water indicates the –
A) Presence of pathogenic bacteria
B) Absence of pathogenic bacteria
C) Presence of non-pathogenic bacteria
D) Absence of non-pathogenic bacteria
Option (A)
Q.17) BOD of safe drinking water must be –
A) 0
B) 10
C) 50
D) 100
Option (A)
Q.18) The detention time for an ordinary plain sedimentation tank is :
A) 1 to 2 Hrs
B) 2 to 4 Hrs
C) 6 to 8 Hrs
D) 20 to 24 Hrs
Option (C)
Q.19) The velocity of flow in any sedimentation tank should not exceed :
A) 0.05 mm/s
B) 0.5mm/s
C) 5 mm/s
D) 50 mm/s
Option (C)
Q.20) The most common coagulant is –
A) Magnesium Sulphate
B) Alum
C) Chlorine
D) Bleaching Powder
Option (B)
