Q.1.
As compared to cast iron pipes, steel pipes are
Q.2.
Sewage treatment units are designed for
Q.3.
Facultative bacteria are able to work in
Q.4.
An egg shaped section of sewer
Q.5.
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)
Q.6.
The self cleansing velocity for all sewers in India is usually
Q.7.
In water treatment, rapid gravity filters are adopted to remove
Q.8.
Most suitable section of sewer in separate sewage system is
Q.9.
The most common cause of acidity in water is
Q.10.
Period of cleaning of slow sand filters is about
Q.11.
Residual chlorine in water is determined by
Q.12.
The means of access for inspection and cleaning of sewer line is known as
Q.13.
The maximum efficiency of BOD removal is achieved in
Q.14.
A sewer that receives the discharge of a number of house sewers is called
Q.15.
As compared to geometrical increase method of forecasting population, arithmetical increase method gives
Q.16.
Double filtration is used
Q.17.
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank
Q.18.
For normal sludge, the value of sludge index for Indian conditions is
Q.19.
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
Q.20.
The percentage of chlorine in fresh bleaching powder is about
Q.21.
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
Q.22.
Dissolved oxygen in streams is
Q.23.
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
Q.24.
A pipe which is installed in the house drainage to preserve the water seal of traps is called
Q.25.
The rate of Alteration of pressure filters is
Q.26.
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
Q.27.
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
Q.28.
Which of the following is not a water borne disease?
Q.29.
The rate of BOD exerted at any time is
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