Environmental Engineering (3160611) MCQs

MCQs of Air and noise pollution

Showing 21 to 27 out of 27 Questions
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21.

Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.

(a)

20
(b)

100
(c)

400
(d)

200
Answer:

Option (c)

22.

Higher concentration of CO2 in atmosphere

(a)

allows visible solar radiation (ultraviolet) of short wave-length to pass through.
(b)

reflects and absorbs the longer wavelength (infra-red) radiations.
(c)

prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
(d)

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

Option (d)

23.

Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

(a)

highly
(b)

moderately
(c)

moderately
(d)

very extremely
Answer:

Option (b)

24.

Radioactive substances present in the polluted water stream can be removed by

(a)

biological oxygen treatment.
(b)

coagulation and filtration.
(c)

adsorption in ion exchange materials
(d)

none of these.
Answer:

Option (c)

25.

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)

26.

Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

(a)

85
(b)

105
(c)

125
(d)

145
Answer:

Option (b)

27.

Inhalation of silica dust causes a disease called

(a)

bronchitis
(b)

silicosis
(c)

pneumoconiosis
(d)

none of these
Answer:

Option (b)

Showing 21 to 27 out of 27 Questions
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