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Quiz 1
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Q.1
The suitable layout of a distribution system for irregularly growing town is
Dead end system
Grid iron system
Radial system
Ring system
Q.2
The alum, when added as a coagulant in water
Does not require alkalinity in water for flocculation
Does not affect pH value of water
Increases pH value of water
Decreases pH value of water
Q.3
Standard BOD is measured at
20°C - 1 day
25°C - 3 day
20°C - 5 day
30°C - 5 day
Q.4
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is
Steel
Cast iron
Copper
Reinforced cement concrete
Q.5
Assertion A: The consumption of water increases with increase in the distribution pressure.
Reason R: Higher distribution pressure causes more loss and waste of water
Select your answer according to the coding system given below
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Q.6
When there is no recirculation of sewage, then recirculation factor is
0
1
Infinity
None of the above
Q.7
On standard silica scale, the turbidity in drinking water should be limited to
10 ppm
20 ppm
30 ppm
50 ppm
Q.8
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Q.9
Which of the following sewers is preferred for combined system of sewage?
Circular sewer
Egg shaped sewer
Rectangular sewer
None of the above
Q.10
The most commonly used sewer under culverts is
Circular brick sewer
Circular cast iron sewer
Semi-elliptical sewer
Horseshoe type sewer
Q.11
Ground water is usually free from
Suspended impurities
Dissolved impurities
Both suspended and dissolved impurities
None of the above
Q.12
The layout of distribution system in which water flows towards the outer periphery is
Ring system
Dead end system
Radial system
Grid iron system
Q.13
The settling velocity of a particle in a sedimentation tank increases if
Particle size is decreased
The surface area of tank is increased
The depth of tank is decreased
None of the above
Q.14
Air binding phenomena in rapid sand filters occur due to
Excessive negative head
Mud ball formation
Higher turbidity in the effluent
Low temperature
Q.15
The detention period for oxidation ponds is usually kept as
48 hours
24 hours
10 to 15 days
3 months
Q.16
If the sewage contains grease and fatty oils, these are removed in
Grit chambers
Detritus tanks
Skimming tanks
Sedimentation tanks
Q.17
The design discharge for the separate sewer system shall be taken as
Equal to dry weather flow (DWF)
2 × DWF
3 × DWF
6 × DWF
Q.18
The main disadvantage of oxidation pond is that
Large area is required for construction
Maintenance and operation cost are high
BOD removal is very low
None of the above
Q.19
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
Equal to HMD when flowing full
Less than HMD when flowing full
Greater than HMD when flowing full
None of the above
Q.20
Settling velocity increases with
Specific gravity of solid particles
Size of particles
Depth of tank
Temperature of liquid
Q.21
The per capital consumption of a locality is affected by
(i) Climatic conditions
(ii) Quality of water
(iii) Distribution pressure
Only (i)
Both (i) and (ii)
Both (i) and (iii)
All (i), (ii) and (iii)
Q.22
Alkalinity in water is expressed as milligrams per litre in terms of equivalent
Calcium carbonate
Magnesium carbonate
Sodium carbonate
Calcium hydroxide
Q.23
The chemical most commonly used to increase speed of sedimentation of sewage is
Sulphuric acid
Copper sulphate
Lime
Sodium permanganate
Q.24
Select the correct statement.
5 day BOD is the ultimate BOD
5 day BOD is greater than 4 day BOD keeping other conditions same
5 day BOD is less than 4 day BOD keeping other conditions same
BOD does not depend on time
Q.25
The devices which are installed for drawing water from the sources are called
Aquifers
Aquiclude
Filters
Intakes
Q.26
The treatment of water with bleaching powder is known as
Pre-chlorination
Super chlorination
De-chlorination
Hypo-chlorination
Q.27
Which of the following causes a decrease in per capita consumption?
Use of metering system
Good quality of water
Better standard of living of the people
Hotter climate
Q.28
The process in which the chlorination is done beyond the break point is known as
Pre-chlorination
Post chlorination
Super chlorination
Break point chlorination
Q.29
Alum as a coagulant is found to be most effective when pH range of water is
2 to 4
4 to 6
6 to 8
8 to 10
Q.30
The design discharge for the combined sewer system shall be taken as
Equal to rainfall
Rainfall + DWF
Rainfall + 2 DWF
Rainfall + 6 DWF
0 h : 0 m : 1 s
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