MCQ
17861.
The most common cause of acidity in water is-
hydrogen
carbon dioxide
oxygen
all of theese
17862.
pH value is a symbol for ---concentration.
magnesium
hydrogen
calcium
sodium
17863.
The maximum permissible turbidity for domestic supplies, on silica scale is-
5 to 10 ppm
20 to 30 ppm
10 to 20 ppm
30 to 40 ppm
17864.
The presence of hydrogen sulphide in water causes-
softening
acidity
alkalinity
bad taste
17865.
The water bearing strata i.e. layers of sand, gravel etc. is called-
an aquifer
zone of saturation
an aquifuge
an aquiclude
17866.
The groundwater is generally free from impurities.
suspended
dissolved
17867.
The presence of sodium chloride in water-
stops epidemic
increases hardness of water
causes bad taste
softens the water
17868.
The quality of tube well water is ---as compaired to surface water
good
poor
17869.
The max" permissible total solid content in water for domestic purposes should not exceed-
300 ppm
400 ppm
500 ppm
1000 ppm
17870.
The most important source of water for public water supply is-
lake
pond
river
sea
17871.
Suspended impurities consist of-
iron
bacteria
chlorine
all of these
17872.
The open wells or dug wells are also known as-
shallow wells
percolation wells
draw wells
all of these
17873.
The maximum permissible temperature for domestic supply is-
5 to 10°C
10 to 15°C
15 to 20°C
20 to 25°C
17874.
The maximum acidity in water will occur at a pH value of-
0
7
2
14
17875.
The maximum permissible colour for domestic supplies, on platinum cobalt scale is-
5 to 10 ppm
10 to 20 ppm
20 to 30 ppm
30 to 40 ppm
17876.
Absolute pure water is good for health.
right
wrong
17877.
The design period for a water supply project is taken as-
5 to 10 years
15 to 20 years
10 to 15 years
20 to 30 years
17878.
The presence of bacteria in water causes-
hardness
diseases
alkalinity
bad taste
17879.
The water obtained from is generally known as sub-surface water---
rain
reservoirs
rivers
artesian wells
17880.
The water obtained from a lake is known as surface water.
Agree
Disagree