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19.

Ground water is usually free from

A.	suspended impurities	B.	dissolved impurities
C.	both suspended and dissolved impuri¬ties	D.	none of the above

20.

If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be

A.	100000m3	B.	150000m3
C.	180000m3	D.	270000 m3

21.

If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

A.	4 mm/hr	B.	lOmm/hr
C.	20 mm/hr	D.	40 mm/hr

22.

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

A.	total alkalinity	B.	total hardness
C.	total hardness - total alkalinity	D.	non carbonate hardness

23.

In chlorination, with the rise in temperature of water, death rate of bacteria

A.	increases	B.	decreases
C.	remains unaffected	D.	none of the above

24.

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

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