A. it is unsuitable for turbid and acidic water
B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardness
Related Mcqs:
- In lime-soda process________________?
A. only carbonate hardness is removed
B. only non-carbonate hardness is re-moved
C. lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
D. lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness - The main disadvantage of oxidation pond is that________________?
A. large area is required for construction
B. maintenance and operation cost are high
C. BOD removal is very low
D. none of the above - The main disadvantage of cement concrete sewers is________________?
A. less strength
B. difficulty in construction
C. difficulty in transportation due to heavy weight
D. less life - Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true - Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?
A. 10 to 25
B. 50
C. 75
D. 100 - The most common cause of acidity in water is_______________?
A. carbon dioxide
B. oxygen
C. hydrogen
D. nitrogen - In water treatment, rapid gravity filters are adopted to remove_______________?
A. dissolved organic substances
B. dissolved solids and dissolved gases
C. floating solids and dissolved inorganic solids
D. bacteria and colloidal solids - The suitable method for disinfection of swimming pool water is________________?
A. ultra violet rays treatment
B. lime treatment
C. by using potassium permanganate
D. chlorination - The water carriage system of collection of waste product________________?
A. is cheaper in initial cost than dry conservancy system
B. requires treatment before disposal
C. creates hygenic problem
D. all of the above - Which of the following is not a water borne disease ?
A. dysentery
B. cholera
C. typhoid
D. maleria
