Septic tank is a______________?

Question: Most of the bacteria in sewage are
[A].

parasitic

[B].

saprophytic

[C].

anerobic

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Iron & manganese present in the polluted water is removed by
[A].

simple filtration.

[B].

oxidation followed by settling & filtration.

[C].

chemical coagulation.

[D].

chlorination only.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Maximum permissible residual chlorine in treated water should be __________ mg/litre.
[A].

0.001 to 0.01

[B].

02 to 0.3

[C].

2 to 3

[D].

5 to 10

Answer: Option B

Explanation:

No answer description available for this question.

Question: A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
[A].

global warming

[B].

green house

[C].

atmospheric effect

[D].

ionosphere

Answer: Option B

Explanation:

No answer description available for this question.

Question: Main pollutants released from petroleum refineries is
[A].

CO, SO2 & H2S.

[B].

CO2, NO & SO3.

[C].

CO2, H2S & NO2.

[D].

SO3, NO2 & CO2.

Answer: Option A

Explanation:

No answer description available for this question.