The detention period for oxidation ponds is usually kept as______________?

Question: Inhalation of silica dust by human being causes
[A].

asphyxiation

[B].

shortness of breath

[C].

tuberculosis

[D].

both(b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Infective bacteria in water is killed by the __________ process.
[A].

sterilisation

[B].

aeration

[C].

disinfection

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ can not control the noise pollution.
[A].

Use of silencers

[B].

Green house gases

[C].

Vibration damping

[D].

Tree plantation

Answer: Option B

Explanation:

No answer description available for this question.