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Quiz 4
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Q.1
Dissolved oxygen in streams is
Maximum at noon
Minimum at noon
Maximum at midnight
Same throughout the day
Q.2
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.3
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)
Q.4
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
10 to 25
50
75
100
Q.5
The type of sewer which is suitable for both combined and separate system is
Circular sewer
Egg shaped sewer
Horseshoe type sewer
Semi-elliptical sewer
Q.6
Which of the following is not a water borne disease?
Dysentery
Cholera
Typhoid
Malaria
Q.7
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.8
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.9
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.10
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
1 ppm
4 ppm
10 ppm
40 ppm
Q.11
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
1 mg/liter
10 mg/liter
100 mg/liter
1000 mg/liter
Q.12
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
0.01 to 0.05 ppm
0.05 to 0.5 ppm
0.5 to 1.0 ppm
1.0 to 5.0 ppm
Q.13
Which of the following retards the self purification of stream?
Higher temperature
Sunlight
Satisfying oxygen demand
None of the above
Q.14
Sewage treatment units are normally designed for
5 - 10 years
15 - 20 years
30 - 40 years
40 - 50 years
Q.15
Generally the detention period for grit chambers is kept as
1 minute
5 minutes
24 hours
12 hours
Q.16
Activated carbon is used for
Disinfection
Removing hardness
Removing odours
Removing corrosiveness
Q.17
The gas from sludge digestion tank is mainly composed of
Nitrogen
Carbon dioxide
Hydrogen sulphide
Methane
Q.18
The maximum efficiency of BOD removal is achieved in
Oxidation pond
Oxidation ditch
Aerated lagoons
Trickling filters
Q.19
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
TOD > BOD > COD
TOD > COD > BOD
BOD > COD > TOD
COD > BOD > TOD
Q.20
As compared to shallow wells, deep wells have
More depth
Less depth
More discharge
Less discharge
Q.21
As compared to cast iron pipes, steel pipes are
Heavier
Stronger
Costlier
Less susceptible to corrosion
Q.22
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.23
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.24
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Q.25
The amount of coagulant needed for coagulation of water increases with
(i) Increase in turbidity of water
(ii) Decrease in turbidity of water
(iii) Increase in temperature of water
(iv) Decrease in temperature of water
The correct answer is
(i) and (ii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
Q.26
The polluted water is one which
Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is safe and suitable for drinking and domestic use
Is contaminated
Q.27
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
100 ppm
200 ppm
300 ppm
400 ppm
Q.28
The minimum and maximum diameters of sewers shall preferably be
15 cm and 100 cm
15 cm and 300 cm
30 cm and 450 cm
60 cm and 300 cm
Q.29
The biochemical treatment of sewage effluents is essentially a process of
Oxidation
Dehydration
Reduction
Alkalinization
Q.30
Sewerage system is usually designed for
10 years
25 years
50 years
75 years
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