Water Treatment

Question: The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
[A].

600 ppm

[B].

300 ppm

[C].

500 ppm

[D].

1000 ppm

Answer: Option B

Explanation:

No answer description available for this question.

Question: According to BIS the maximum permissible limit of dissolved solids in drinking water is
[A].

1000 mg/l

[B].

500 mg/l

[C].

2000 mg/l

[D].

1500 mg/l

Answer: Option C

Explanation:

No answer description available for this question.

Question: The maximum permissible limit (BIS) of turbidity in drinking water is
[A].

5 NTU

[B].

10 NTU

[C].

15 NTU

[D].

20 NTU

Answer: Option B

Explanation:

No answer description available for this question.

Question: The maximum desirable limit (BIS of mercury in the drinking water is
[A].

0.05 mg/l

[B].

0.9 mg/l

[C].

0.1 mg/l

[D].

0.001 mg/l

Answer: Option D

Explanation:

No answer description available for this question.

Question: The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
[A].

0.05 mg/l

[B].

0.09 mg/l

[C].

0.1 mg/l

[D].

1.0 mg/l

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following substances are commonly used in a filter?
[A].

Charcoal

[B].

Sand

[C].

Both (a) and (b)

[D].

Aluminum chloride

Answer: Option C

Explanation:

No answer description available for this question.

Question: Calgon is used for removal of
[A].

sodium carbonate

[B].

permanent hardness of water

[C].

potassium carbonate

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Hardness of water does not
[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

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
[A].

Chlorination

[B].

Treating with potassium permagnate

[C].

UV radiation

[D].

Treating with bleaching powder

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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
[A].

10% calcium chloride solution

[B].

10% magnesium sulfate solution

[C].

10% magnesium chloride solution

[D].

10% sodium chloride solution

Answer: Option D

Explanation:

No answer description available for this question.