The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
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Civil Engineering · all questionsEnvironmental Engineering
Environmental Engineering
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Which of the following retards the self purification of stream?
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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) 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
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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 water
The correct answer is
(i) Increase in turbidity of water
(ii) Decrease in turbidity of water
(iii) Increase in temperature of water
(iv) Decrease in temperature of water
The correct answer is
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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) 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
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Sludge volume index is defined as the ratio of
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The maximum permissible limit for fluoride in drinking water is
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Facultative bacteria are able to work in
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The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
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The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
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As compared to geometrical increase method of forecasting population, arithmetical increase method gives
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The rate of BOD exerted at any time is
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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
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test
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Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
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The type of sewer which is suitable for both combined and separate system is
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Which of the following is not a water borne disease?
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The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
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The rate of Alteration of pressure filters is
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A pipe which is installed in the house drainage to preserve the water seal of traps is called
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Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
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