The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
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The percentage of chlorine in fresh bleaching powder is about
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For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
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Dissolved oxygen in streams is
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If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
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For normal sludge, the value of sludge index for Indian conditions is
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The most common cause of acidity in water is
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The length of rectangular sedimentation tank should not be more than
(Where ‘B’ is the width of the tank)
(Where ‘B’ is the width of the tank)
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Septic tank is a
(i) Settling tank
(ii) Digestion tank
(iii) Aeration tank
(i) Settling tank
(ii) Digestion tank
(iii) Aeration tank
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Double filtration is used
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Which of the following chemical compounds can be used for de-chlorination of water?
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The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
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The suitable method for disinfection of swimming pool water is
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The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
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Disinfection efficiency is
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The time of concentration is defined as
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The velocity of flow of water in a sedimentation tank is about
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Hardy cross method of analysis of distribution system
(i) Involves successive trials
(ii) Takes economic aspects into account
(iii) Is time consuming
(i) Involves successive trials
(ii) Takes economic aspects into account
(iii) Is time consuming
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A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
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The depression of water table in a well due to pumping will be maximum
(Where ‘R’ is the radius of influence)
(Where ‘R’ is the radius of influence)
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