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Water Treatment Online Exam Quiz

Important questions about Water Treatment. Water Treatment MCQ questions with answers. Water Treatment exam questions and answers for students and interviews.

1. The maximum permissible limit (BIS) of turbidity in drinking water is

Options

A : 5 NTU

B : 10 NTU

C : 15 NTU

D : 20 NTU

2. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

Options

A : 10% calcium chloride solution

B : 10% magnesium sulfate solution

C : 10% magnesium chloride solution

D : 10% sodium chloride solution

3. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is

Options

A : 0.05 mg/l

B : 0.09 mg/l

C : 0.1 mg/l

D : 1.0 mg/l

4. When temporary hard water is boiled, one of the substances formed is

Options

A : calcium bicarbonate

B : calcium sulfate

C : hydrogen chloride

D : carbon dioxide

5. The chemical oxygen demand (COD)measures the

Options

A : amount of oxygen required for growth of microorganisms in water

B : amount of oxygen that would be removed from the water in order to oxidize pollution

C : amount of oxygen required to oxidize the calcium present in waste water

D : none of the above

6. Hardness of water does not

Options

A : have any bad effect in boiler

B : make cooking of foods difficult

C : make it unfit for drinking

D : cause difficulty in the washing of clothes with soaps

7. Permanent hard water may be softened by passing it through

Options

A : sodium silicate

B : sodium bicarbonate

C : sodium hexametaphosphate

D : sodium phosphate

8. Sedimentation is a physical process used in wastewater treatment to

Options

A : remove particles that are less dense than water

B : remove particles that are more dense than water

C : remove the pertinacious material from the water

D : none of the above

9. Biological oxidation processes usually referred as biological treatment, are the most common form of

Options

A : primary treatment

B : secondary treatment

C : tertiary treatment

D : all of these

10. Which of the following chemical is sometime added in the process of coagulation and flocculation?

Options

A : Aluminum sulphate

B : Aluminum oxide

C : Calcium chloride

D : None of these

1. Zeolite softening process removes

Options

A : only temporary hardness of water

B : only permanent hardness of water

C : both temporary and permanent hardness of water

D : the dissolved gases in permanent hard water

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

Options

A : 5 proteolytic and/or lipolytic organisms per ml

B : 10 proteolytic and/or lipolytic organisms per ml

C : 15 proteolytic and/or lipolytic organisms per ml

D : 20 proteolytic and/or lipolytic organisms/ml

3. Both temporary and permanent hardness of water can be removed on boiling water with

Options

A : calcium hydroxide

B : sodium carbonate

C : calcium oxide

D : calcium carbonate

4. Conventional tertiary treatment is

Options

A : chemical coagulation and flocculation

B : filtration

C : sedimentation

D : none of these

5. According to BIS the maximum permissible limit of dissolved solids in drinking water is

Options

A : 1000 mg/l

B : 500 mg/l

C : 2000 mg/l

D : 1500 mg/l

6. Permanent hardness of water is caused by the presence of

Options

A : bicarbonates of calcium and magnesium

B : carbonates of sodium and potassium

C : chlorides and sulfates of calcium and magnesium

D : phosphates of sodium and potassium

7. The purest form of naturally occurring water is

Options

A : rain water

B : river water

C : pond water

D : well water

8. The maximum desirable limit (BIS) of total hardness (as CaCo 3 ) in drinking water is

Options

A : 600 ppm

B : 300 ppm

C : 500 ppm

D : 1000 ppm

9. Acid used mostly for removal of milk stone is

Options

A : phosphoric acid

B : nitric acid

C : gluconic acid

D : tartaric acid

10. Lagoons may be characterized as

Options

A : anaerobic

B : facultative

C : aerated

D : all of these

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