Engineering Questions with Answers - Multiple Choice Questions

Environmental Science MCQ – Air Pollution – Sources – 2

1 - Question

What is the residence time (average time a particle is active in a given system) of carbon monoxide?
a) 11-15 years
b) 0.1-0.3 years
c) 0.5 years
d) Few minutes

View Answer

Answer: b
Explanation: The residence time is the average time a particle remains active in a given system.

2 - Question

Which of the following gases has the highest affinity for blood haemoglobin?
a) Carbon dioxide
b) Oxygen
c) Carbon monoxide
d) Nitrogen

View Answer

Answer: c
Explanation: It has 200 times greater affinity for haemoglobin than oxygen.

3 - Question

At what concentration can the taste and smell of sulphur dioxide be detected?
a) 1000-2000ppm
b) 11-30ppm
c) 500-700ppm
d) 0.1-0.3ppm

View Answer

Answer: d
Explanation: Sulphur dioxide has a pungent odour which can be detected in even in very minute concentrations in the range of 0.1 – 0.3 parts per million.

4 - Question

Which is the major source for sulphur dioxide?
a) Volcanic eruptions
b) Coal and crude oil combustion
c) Burning of petrol
d) Sewage treatment process

View Answer

Answer: b
Explanation: Though emission of sulphur dioxide is peak during volcanic eruptions, its major source is during combustion of crude oil and coal for heat and power generation.

5 - Question

Which is the largest source for production of nitrous oxide?
a) Chemical industry
b) Fertiliser industry
c) Fossil fuel combustion
d) Bacterial action

View Answer

Answer: d
Explanation: Denitrifiers (such as ammonia oxidising bacteria) in aerobic conditions serve as the major producer for nitrous oxide.

6 - Question

Pesticides also contribute to air pollution along with polluting underground reservoirs.
a) True
b) False

View Answer

Answer: a
Explanation: The method of spraying pesticides leads to small portion of pesticide serving as an air pollutant. Some pesticides evaporate from soil and pollute the air. Eg. DDT.

7 - Question

Which of the following are sources to fluorine air pollution?
a) Coal combustion
b) Steel industries
c) Phosphate fertiliser manufacturing
d) All of the mentioned

View Answer

Answer: d
Explanation: Phosphate rock (Fluorapatite) is used for manufacturing of fertilisers and contributes to fluorine air pollution along with steel industries and coal combustion.

8 - Question

Which is/are the most significant air-borne allergen(s)?
a) Fungi
b) Pollen
c) Soot
d) All of the mentioned

View Answer

Answer: b
Explanation: Pollen grains are the most significant air-borne allergen with an indestructible outer membrane, and are known to cause severe respiratory problems when inhaled.

9 - Question

Which of the following is a source for boron air pollution?
a) Rockets and jets
b) Automobiles
c) Soap industries
d) Refrigerants

View Answer

Answer: a
Explanation: Borane is mixed with petroleum and used as a fuel in rockets and jets which when combusted releases boron which causes air pollution.

10 - Question

Which are the sources of arsenic pollution?
a) Coal and petroleum
b) Detergents and pesticides
c) Mine tailings
d) All of the mentioned

View Answer

Answer: d
Explanation: Arsenic is a human carcinogen and is emitted during the combustion of coal and petroleum. It is also found in detergents, pesticides and mine tailings.

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