Water Treatment MCQs

Question 1

Lagoons may be characterized as

Accepted Answer

all of these

Answer

anaerobic

Answer

facultative

Answer

aerated

Question 2

Temporary hardness of water may be removed by adding

Accepted Answer

calcium hydroxide

Answer

calcium carbonate

Answer

calcium chloride

Answer

sodium bicarbonate

Question 3

The maximum desirable limit (BIS of mercury in the drinking water is

Accepted Answer

0.001 mg/l

Answer

0.05 mg/l

Answer

0.9 mg/l

Answer

0.1 mg/l

Question 4

From the following sanitizers which one comes under category of surface active agents?

Accepted Answer

Teepol

Answer

Tetra phosphate

Answer

Meta phosphate

Answer

None of these

Question 5

The purest form of naturally occurring water is

Accepted Answer

rain water

Answer

river water

Answer

pond water

Answer

well water

Question 6

Calgon is used for removal of

Accepted Answer

permanent hardness of water

Answer

sodium carbonate

Answer

potassium carbonate

Answer

none of these

Question 7

The water being used in dairy industry should contain not more than

Accepted Answer

5 proteolytic and/or lipolytic organisms per ml

Answer

10 proteolytic and/or lipolytic organisms per ml

Answer

15 proteolytic and/or lipolytic organisms per ml

Answer

20 proteolytic and/or lipolytic organisms/ml

Question 8

The activated sludge process consists of returning a portion of the clarifier

Accepted Answer

influent water entering the reactor

Answer

effluent water entering the reactor

Answer

influent water coming out of the reactor

Answer

effluent water coming out of the reactor

Question 9

The activated sludge process is sometime referred as

Accepted Answer

fluid bed biological oxidation system

Answer

fixed bed biological oxidation system

Answer

turning bed biological oxidation system

Answer

none of the above