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25.

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

26.

On standard silica scale, the turbidity in drinking water should be limited to

A.	10 ppm	B.	20 ppm
C.	30 ppm	D.	50 ppm

27.

Orthotolidine test is used for determination of

A.	dissolved oxygen	B.	residual chlorine
C.	biochemical oxygen demand	D.	dose of coagulant

28.

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

29.

Period of cleaning of slow sand filters is about

A.	24 - 48 hours	B.	10-12 days
C.	2-3 months	D.	1-2 year

30.

Residual chlorine in water is determined by

A.	starch iodide method	B.	orthotolidine method
C.	both (a) and (b)	D.	none of the above

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