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Quiz 6
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Q.1
As compared to cast iron pipes, steel pipes are
Heavier
Stronger
Costlier
Less susceptible to corrosion
Q.2
Sewage treatment units are designed for
Maximum flow only
Minimum flow only
Average flow only
Maximum and minimum flow
Q.3
Facultative bacteria are able to work in
Presence of oxygen only
Absence of oxygen only
Presence as well as in absence of oxygen
Presence of water
Q.4
An egg shaped section of sewer
Is economical than circular section
Provides self cleansing velocity at low discharges
Is more stable than circular section
Is easy to construct
Q.5
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)
B
2B
4B
8B
Q.6
The self cleansing velocity for all sewers in India is usually
Less than 1.0 m/sec
1.0 m/sec to 1.2 m/sec
1.5 m/sec to 2.0 m/sec
3.0 m/sec to 3.5 m/sec
Q.7
In water treatment, rapid gravity filters are adopted to remove
Dissolved organic substances
Dissolved solids and dissolved gases
Floating solids and dissolved inorganic solids
Bacteria and colloidal solids
Q.8
Most suitable section of sewer in separate sewage system is
Rectangular section
Circular section
Standard form of egg shaped sewer
Modified egg shaped section
Q.9
The most common cause of acidity in water is
Carbon dioxide
Oxygen
Hydrogen
Nitrogen
Q.10
Period of cleaning of slow sand filters is about
24 - 48 hours
10 - 12 days
2 - 3 months
1 - 2 year
Q.11
Residual chlorine in water is determined by
Starch iodide method
Orthotolidine method
Both (A) and (B)
None of the above
Q.12
The means of access for inspection and cleaning of sewer line is known as
Inlet
Manhole
Drop manhole
Catch basin
Q.13
The maximum efficiency of BOD removal is achieved in
Oxidation pond
Oxidation ditch
Aerated lagoons
Trickling filters
Q.14
A sewer that receives the discharge of a number of house sewers is called
House sewer
Lateral sewer
Intercepting sewer
Sub-main sewer
Q.15
As compared to geometrical increase method of forecasting population, arithmetical increase method gives
Lesser value
Higher value
Same value
Accurate value
Q.16
Double filtration is used
To increase the filtration slow sand filters capacity of
To increase the filtration rapid sand filters capacity of
For isolated buildings like pools, hotels etc swimming
All of the above
Q.17
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank
Only (i)
(i) and (ii)
(i) and (iii)
Only (iii)
Q.18
For normal sludge, the value of sludge index for Indian conditions is
0 to 50
50 to 150
150 to 350
350 to 500
Q.19
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
0.2 to 0.4
0.4 to 1.0
2 to 4
5 to 7
Q.20
The percentage of chlorine in fresh bleaching powder is about
10 to 15
20 to 25
30 to 35
40 to 50
Q.21
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
Separate system
Combined system
Partially combined system
Partially separate system
Q.22
Dissolved oxygen in streams is
Maximum at noon
Minimum at noon
Maximum at midnight
Same throughout the day
Q.23
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
4 mm/hr
10 mm/hr
20 mm/hr
40 mm/hr
Q.24
A pipe which is installed in the house drainage to preserve the water seal of traps is called
Vent pipe
Anti-siphonage pipe
Waste pipe
Soil pipe
Q.25
The rate of Alteration of pressure filters is
Less than that of slow sand filters
In between the filtration rate of slow sand filters and rapid sand filters
Greater than that of rapid sand filters
Equal to that of slow sand filters
Q.26
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
N = y + R
y = N + R
R = N + y
R > (N + y)
Q.27
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
Reflux valve
Sluice valve
Air relief valve
Pressure relief valve
Q.28
Which of the following is not a water borne disease?
Dysentery
Cholera
Typhoid
Malaria
Q.29
The rate of BOD exerted at any time is
Directly proportional to BOD satisfied
Directly proportional to BOD remaining
Inversely proportional to BOD satisfied
Inversely proportional to BOD remaining
Q.30
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test
Only (i)
Both (i) and (ii)
Both (i) and (iii)
All (i), (ii) and (iii)
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