Environmental Engineering

Question: In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
[A].

t = 15 – 0.0065h

[B].

t = 15 + 0.0065h

[C].

t = 0.0035h -15

[D].

t = 15 – 0.0035h

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the context of the chemical process industries, the term BOD is normally associated with the
[A].

characterisation of solid wastes.

[B].

organic concentration in gaseous effluents.

[C].

characterisation of liquid effluents.

[D].

characterisation of boiler feed water.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
[A].

cesspool

[B].

lagoon

[C].

skimming mill

[D].

septic tank

Answer: Option D

Explanation:

No answer description available for this question.

Question: Carcinogenic air pollutants cause
[A].

bone decay

[B].

cancer

[C].

asphyxiation (suffocation)

[D].

anemia

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dissolved oxygen content in river water is around __________ ppm.
[A].

5

[B].

100

[C].

250

[D].

500

Answer: Option A

Explanation:

No answer description available for this question.

Question: Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
[A].

1-2

[B].

5-10

[C].

15-20

[D].

25-30

Answer: Option B

Explanation:

No answer description available for this question.

Question: Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
[A].

CO2

[B].

SO2

[C].

hydrocarbons

[D].

CFC (chloro fluoro carbon)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Ozone level is generally found to be depleted in India in the month of
[A].

February

[B].

July

[C].

April

[D].

December

Answer: Option D

Explanation:

No answer description available for this question.

Question: Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
[A].

CO2

[B].

H2

[C].

SO3

[D].

N2

Answer: Option C

Explanation:

No answer description available for this question.

Question: Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
[A].

hydrogen sulphide

[B].

mercury

[C].

cadmium

[D].

asbestos

Answer: Option C

Explanation:

No answer description available for this question.