The overflow rate for plain sedimentation tanks is about__________________?

Question: Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
[A].

50

[B].

1000

[C].

2000

[D].

5000

Answer: Option D

Explanation:

No answer description available for this question.

Question: Noise pollution level in a chemical plant is expressed in
[A].

roentgen

[B].

decibel

[C].

hertz

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: A shallow pond in which the sewage is retained and biologically treated is called
[A].

oxidation

[B].

Imhoff tank

[C].

lagoon

[D].

skimming tank

Answer: Option A

Explanation:

No answer description available for this question.

Question: World’s worst radioactive pollution was caused by nuclear reactor disaster which occured in
[A].

Arizona (U.S.A.)

[B].

Chernobyl (undivided U.S.S.R.)

[C].

Pensylvania (U.S.A.)

[D].

Moscow (U.S.S.R.)

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ substances present in sewage are removed in grit chamber during sewage treatment.
[A].

Organic

[B].

Fatty

[C].

Inorganic

[D].

Dissolved

Answer: Option C

Explanation:

No answer description available for this question.