MCQ
21021. The quality of tube well water is ---as compaired to surface water
good
poor
21022. The water obtained from is generally known as sub-surface water---
rain
reservoirs
rivers
artesian wells
21023. The term sullage refers to-
fresh waste water
waste water from kitchen and laundry
septic waste water
toxic waste water
21024. The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended ------
100 mm
200mm
150mm
175mm
21025. The water bearing strata i.e. layers of sand, gravel etc. is called-
an aquifer
zone of saturation
an aquifuge
an aquiclude
21026. A manhole is generally provided at each-
bend
change of gradient
junction
all the above
21027. Which of the following protects penstock due to sudden variation of flow or velocity of water?
Anchors
Trash rack
Forebays
Surge tank
21028. Absolute zero temperature = ?
0°C
273°C
-273°C
None
21029. What do you mean by BOD?
Best organized demand
Biochemical oxygen demand
Before oxidation damage
Bacteria of damage
21030. The maximum permissible limit for iron in drinking water is-
0.1 mg/L
0.3-1 mg/L
2-2.5 mg/L
5 mg/L
21031. Disinfection of water results in-
Removal of turbidity
Removal of taste
Killing of disease bacteria
Removal of hardness
21032. Standard BOD is measured at-
20°C-1 day
25°C-3 day
20°C-5 day
30°C-5 day
21033. The water obtained from a lake is known as surface water.
Agree
Disagree
21034. What is the example of metamorphic rock?
granite
genesis
marble
all of these
21035. Main element of biogas is
CO2
Cow dung
Water
CH4
21036. The presence of sodium chloride in water-
stops epidemic
increases hardness of water
causes bad taste
softens the water
21037. Arsenic contamination has primarily affected-
the deep aquifer
the river
the shallow aquifer
none
21038. The open wells or dug wells are also known as-
shallow wells
percolation wells
draw wells
all of these
21039. Slow sand filter is efficient to remove the bacteria from the raw water to an extent of-
50%
70%
85%
99%
21040. Absolute pure water is good for health.
right
wrong