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Quiz 5
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Q.1
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.2
In facultative stabilization pond, the sewage is treated by
Aerobic bacteria only
Algae only
Dual action of aerobic bacteria and anaerobic bacteria
Sedimentation
Q.3
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
Hardness in water
Turbidity in water
Dissolved oxygen in water
Residual chlorine in water
Q.4
The hourly variation factor is usually taken as
1.5
1.8
2.0
2.7
Q.5
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 filters
The correct answer is
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Q.6
In chlorination, with the rise in temperature of water, death rate of bacteria
Increases
Decreases
Remains unaffected
None of the above
Q.7
The characteristics of fresh and septic sewage respectively are
Acidic and alkaline
Alkaline and acidic
Both acidic
Both alkaline
Q.8
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
Circle method
Equivalent pipe method
Electrical analysis method
Hardy cross method
Q.9
Residual chlorine in water is determined by
Starch iodide method
Orthotolidine method
Both (A) and (B)
None of the above
Q.10
Disinfection of water results in
Removal of turbidity
Removal of hardness
Killing of disease bacteria
Complete sterilisation
Q.11
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
Total alkalinity
Total hardness
Total hardness total alkalinity
Non carbonate hardness
Q.12
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.13
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.14
The means of access for inspection and cleaning of sewer line is known as
Inlet
Manhole
Drop manhole
Catch basin
Q.15
The phenolic compounds in public water supply should not be more than
0.1 ppm
0.01 ppm
0.001 ppm
0.0001 ppm
Q.16
The water carriage system of collection of waste product
Is cheaper in initial cost than dry conservancy system
Requires treatment before disposal
Creates hygienic problem
All of the above
Q.17
Laying of sewers is usually done with the help of
A Theodolite
A compass
Sight rails and boning rods
A plane table
Q.18
Orthotolidine test is used for determination of
Dissolved oxygen
Residual chlorine
Biochemical oxygen demand
Dose of coagulant
Q.19
Period of cleaning of slow sand filters is about
24 - 48 hours
10 - 12 days
2 - 3 months
1 - 2 year
Q.20
The rate of filtration in slow sand filters in million litres per day per hectare is about
50 to 60
100 to 150
500 to 600
1400 to 1500
Q.21
A sewer that receives the discharge of a number of house sewers is called
House sewer
Lateral sewer
Intercepting sewer
Sub-main sewer
Q.22
Which of the following values of pH represents a stronger acid?
2
5
7
10
Q.23
The distribution mains are designed for
Maximum daily demand
Maximum hourly demand
Average daily demand
Maximum hourly demand on maximum day
Q.24
Sewage treatment units are designed for
Maximum flow only
Minimum flow only
Average flow only
Maximum and minimum flow
Q.25
The working conditions in imhoff tanks are
Aerobic only
Anaerobic only
Aerobic in lower compartment and anaerobic in upper compartment
Anaerobic in lower compartment and aerobic in upper compartment
Q.26
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.27
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
4.5 to 6.0
6.5 to 8.0
8.5 to 10.0
10.5 to 12.0
Q.28
The pathogens can be killed by
Nitrification
Chlorination
Oxidation
None of the above
Q.29
As compared to shallow wells, deep wells have
More depth
Less depth
More discharge
Less discharge
Q.30
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)
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