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Q.1
The major disadvantage of lime soda process of water softening is that
It is unsuitable for turbid and acidic water
Huge amount of precipitate is formed which creates a disposal problem
The effluent cannot be reduced to zero hardness
It is unsuitable for softening the water of excessive hardness
Q.2
Turbidity is measured on
Standard silica scale
Standard cobalt scale
Standard platinum scale
Platinum cobalt scale
Q.3
The maximum discharge of a tube well is about
5 liters/sec
50 liters/sec
500 liters/sec
1000 liters/sec
Q.4
The velocity of flow does not depend on
Grade of sewer
Length of sewer
Hydraulic mean depth of sewer
Roughness of sewer
Q.5
The slope of sewer shall be
Given in the direction of natural slope of ground
Given in the direction opposite to natural slope of ground
Zero
Steeper than 1 in 20
Q.6
Which of the following unit works in anaerobic conditions?
Sludge digestion tank
Sedimentation tank
Activated sludge treatment
Trickling filters
Q.7
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?
Circle method
Equivalent pipe method
Hardy cross method
Electrical analysis method
Q.8
The detention period in coagulation tanks is usually kept as
1 to 2 minutes
30 to 45 minutes
2 to 6 hours
2 to 6 days
Q.9
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
Smaller
Larger
Same
None of the above
Q.10
The disinfection efficiency of chlorine increases by
(i) Decreasing the time of contact
(ii) Decreasing the temperature of water
(iii) Increasing the temperature of water
Only (i)
Both (i) and (ii)
Both (i) and (iii)
Only (iii)
Q.11
Composting and lagooning are the methods of
Sludge digestion
Sludge disposal
Sedimentation
Filtration
Q.12
Most of the bacteria in sewage are
Parasitic
Saprophytic
Pathogenic
Anaerobic
Q.13
The effect of increasing diameter of sewer on the self cleansing velocity is
To decrease it
To increase it
Fluctuating
Nil
Q.14
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
X/4
X/2
X
2X
Q.15
The overflow rate for plain sedimentation tanks is about
500 to 750 liters/hour/ m²
1000 to 1250 liters/hour/ m²
1250 to 1500 liters/hour/m²
1500 to 2000 liters/hour/m²
Q.16
The main disadvantage of cement concrete sewers is
Less strength
Difficulty in construction
Difficulty in transportation due to heavy weight
Less life
Q.17
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
9500
9800
10100
10920
Q.18
The suitable method of forecasting population for a young and rapidly increasing city is
Arithmetical increase method
Geometrical increase method
Incremental increase method
Graphical method
Q.19
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
1
100
Infinite
Zero
Q.20
Which of the following compounds is widely used for algae control?
Sodium sulphate
Copper sulphate
Sodium chloride
Calcium chloride
Q.21
The process of lagooning is primarily a means of
Reducing the excessive flow in sewers
Disposing of sludge
Increasing the capacity of storage reservoirs
Increasing flow of sewage through imhoff tanks
Q.22
The ratio of 5 day BOD to ultimate BOD is about
1/3
2/3
3/4
1.0
Q.23
The type of valve, which is provided on the suction pipe in a tube-well, is
Air relief valve
Reflux valve
Pressure relief valve
Sluice valve
Q.24
Which of the following chemical compounds can be used for de-chlorination of water?
Carbon dioxide
Bleaching powder
Sulphur dioxide
Chloramines
Q.25
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
Check valve
Sluice valve
Safety valve
Scour valve
Q.26
The suitable method for disinfection of swimming pool water is
Ultra violet rays treatment
Lime treatment
By using potassium permanganate
Chlorination
Q.27
Average rate of water consumption per head per day as per Indian Standard is
100 liters
135 liters
165 liters
200 liters
Q.28
The suitable layout of distribution system for a city with roads of rectangular pattern is
Grid iron system
Dead end system
Ring system
Radial system
Q.29
For a given discharge, the efficiency of sedimentation tank can be increased by
Increasing the depth of tank
Decreasing the depth of tank
Increasing the surface area of tank
Decreasing the surface area of tank
Q.30
The settling velocity of a particle in a sedimentation tank depends on
Depth of tank
Surface area of tank
Both depth and surface area of tank
None of the above
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