If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?

Question: CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
[A].

102

[B].

105

[C].

109

[D].

1015

Answer: Option B

Explanation:

No answer description available for this question.

Question: Coal mines drainage waste water (acidic in nature) results from the earth’s water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
[A].

neutralised by alkali treatment.

[B].

left as such without any treatment.

[C].

diluted with fresh water to reduce its acidity.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: The biological decomposition of organic substances in wastes controlled conditions is called
[A].

incineration

[B].

biological oxidation

[C].

composting

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
[A].

asphyxiation (suffocation).

[B].

shortness of breath.

[C].

tuberculosis.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.