Which of the following is not a water borne disease? Environmental Engineering
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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 waterThe correct answer is
The polluted water is one which
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
A pipe which is installed in the house drainage to preserve the water seal of traps is called
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
Residual chlorine in water is determined by
The phenolic compounds in public water supply should not be more than
The water carriage system of collection of waste product
In chlorination, with the rise in temperature of water, death rate of bacteria
Disinfection of water results in
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
In water treatment, rapid gravity filters are adopted to remove
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
The maximum permissible limit for fluoride in drinking water is
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
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
The most common cause of acidity in water is
Which of the following values of pH represents a stronger acid?
Which of the following retards the self purification of stream?