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Quiz 7
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Q.1
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.2
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.3
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.4
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.5
The maximum permissible limit for fluoride in drinking water is
0.1 mg/liter
1.5 mg/liter
5 mg/liter
10 mg/liter
Q.6
Sludge volume index is defined as the ratio of
Percentage of sludge by volume to percentage of suspended solids by weight
Percentage of sludge by volume to percentage of total solids by weight
Percentage of suspended solids by weight to percentage of sludge by volume
Percentage of total solids by weight to percentage of sludge by volume
Q.7
Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filtersThe correct answer is
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Q.8
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 waterThe correct answer is
(i) and (ii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
Q.9
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.10
Which of the following retards the self purification of stream?
Higher temperature
Sunlight
Satisfying oxygen demand
None of the above
Q.11
Sewage treatment units are normally designed for
5 - 10 years
15 - 20 years
30 - 40 years
40 - 50 years
Q.12
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.13
Activated carbon is used for
Disinfection
Removing hardness
Removing odours
Removing corrosiveness
Q.14
Generally the detention period for grit chambers is kept as
1 minute
5 minutes
24 hours
12 hours
Q.15
In a BOD test, 1.0 ml of raw sewage was diluted toml 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.16
Sewerage system is usually designed for
10 years
25 years
50 years
75 years
Q.17
The biochemical treatment of sewage effluents is essentially a process of
Oxidation
Dehydration
Reduction
Alkalinization
Q.18
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
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