Q.1) The vertical wells provided along the banks of a river to draw ground water in dry season are called :
A) Open wells
B) Tube wells
C) Artesian wells
D) Infiltration wells
Option (D)
Q.2) The yield of the well depends upon the –
A) Permeability of the soil
B) Position of water table
C) Depth of well in impervious layer
D) All of the above
Option (D)
Q.3) The presence of calcium and magnesium chloride in water causes –
A) Softening
B) Bad taste
C) Hardness
D) Turbidity
Option (C)
Q.4) The odour of water can be determined by –
A) Thermometer
B) Osmoscope
C) Jackson’s turbidimeter
D) Barometer
Option (B)
Q.5) The maximum permissible chloride content in water for domestic supplies should not exceed –
A) 250 ppm
B) 350 ppm
C) 450 ppm
D) 550 ppm
Option (A)
Q.6) The pH value of water for public supplies is limited from :
A) 2.5 to 6.5
B) 6.5 to 8
C) 8 to 10.5
D) 10.5 to 15
Option (B)
Q.7) The bacteria which can survive without oxygen is called –
A) Anaerobic bacteria
B) Pathogenic bacteria
C) Aerobic bacteria
D) Non-pathogenic bacteria
Option (A)
Q.8) Copper Sulphate is the most common chemical used for controlling –
A) Bacteria
B) Algae
C) Silt
D) Mineral matter
Option (B)
Q.9) In a plain sedimentation tank, under normal conditions, impurities are removed upto :
A) 20%
B) 50 %
C) 60%
D) 70%
Option (D)
Q.10) The alum when mixed with water as a coagulant –
A) Does not effect pH value of water
B) Decreases pH value of water
C) Increases pH value of water
D) None of the above
Option (B)
Q.11) The sand used for filtration, should not loose weight more than……..when placed in hydrochloric acid for 24 Hrs.
A) 2.5%
B) 5%
C) 7.5%
D) 10%
Option (B)
Q.12) Slow sand filter is efficient to remove the bacterias from the raw water to an extent of :
A) 50%
B) 70%
C) 85%
D) 99%
Option (D)
Q.13) Cleaning of rapid sand filter is done by –
A) Scraping the top layer of filter media
B) Back washing
C) Providing new sand layers
D) None of the above
Option (B)
Q.14) The process of killing pathogenic bacterias from water is called –
A) Sedimentation
B) Filtration
C) Coagulation
D) Disinfection
Option (D)
Q.15) The most commonly used disinfectant for drinking water is –
A) Alum
B) Nitrogen
C) Lime
D) Chlorine
Option (D)
Q.16) The apparatus used for feeding chlorine into water is called –
A) Chlorine tank
B) Chlorinator
C) Aeration fountain
D) None of the above
Option (B)
Q.17) When the chlorine is added beyond the break point, the process of treating the water is known as –
A) Plain chlorination
B) Post-chlorination
C) Dechlorination
D) Super-chlorination
Option (D)
Q.18) The permanent hardness of water can be removed by –
A) Boiling
B) Lime process
C) Lime-soda process
D) Zeolite process
Option (D)
Q.19) A reflux valve is also known as –
A) Safety valve
B) Scour valve
C) Air valve
D) Check valve
Option (D)
Q.20) The suitable layout of distribution system for well planned cities is –
A) Dead end system
B) Ring system
C) Radial system
D) Grid iron system
Option (B)
