Q.1
In water treatment, rapid gravity filters are adopted to remove
Q.2
In facultative stabilization pond, the sewage is treated by
Q.3
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
Q.4
The hourly variation factor is usually taken as
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
Q.6
In chlorination, with the rise in temperature of water, death rate of bacteria
Q.7
The characteristics of fresh and septic sewage respectively are
Q.8
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
Q.9
Residual chlorine in water is determined by
Q.10
Disinfection of water results in
Q.11
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
Q.12
An egg shaped section of sewer
Q.13
Most suitable section of sewer in separate sewage system is
Q.14
The means of access for inspection and cleaning of sewer line is known as
Q.15
The phenolic compounds in public water supply should not be more than
Q.16
The water carriage system of collection of waste product
Q.17
Laying of sewers is usually done with the help of
Q.18
Orthotolidine test is used for determination of
Q.19
Period of cleaning of slow sand filters is about
Q.20
The rate of filtration in slow sand filters in million litres per day per hectare is about
Q.21
A sewer that receives the discharge of a number of house sewers is called
Q.22
Which of the following values of pH represents a stronger acid?
Q.23
The distribution mains are designed for
Q.24
Sewage treatment units are designed for
Q.25
The working conditions in imhoff tanks are
Q.26
The self cleansing velocity for all sewers in India is usually
Q.27
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
Q.28
The pathogens can be killed by
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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