This set of Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Sources and Classification of Air Pollutants – Set 3”.
1. The lifetime of ozone in the atmosphere is 60 weeks.
a) True
b) False
View Answer
Explanation: The lifetime of gases in the atmosphere is its residence time. Residence time is the time for which a gas is retained in the atmosphere. The residence time of ozone in the atmosphere is approximately 60 days.
2. What is the diameter of dust released from industrial sources?
a) 20 microns
b) 30 microns
c) 40 microns
d) 50 microns
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Explanation: Usually, the diameter of dust released from industrial sources is about 20 micrometres. The sizes of dust released from a particular industry may vary depending upon the treatment used, and the material type.
3. Which of the following statements about dust is true?
a) Dust particles never settle
b) All dust particles settle
c) Most dust particles settle
d) Small dust particles settle
View Answer
Explanation: Large dust particles generally settle. Smaller dust particles, with sizes lesser than 5 microns, do not settle onto the surface. That is because they tend to form stable suspensions in air.
4. What is the primary source of smoke?
a) Agriculture
b) Domestic sources
c) Industrial sources
d) Power generation
View Answer
Explanation: Combustion sources are the primary sources of smoke. Combustion is the predominant process used for the generation of power. Therefore, power generation is the main source of smoke released into the atmosphere.
5. Which of the following industries is the primary source of organic vapours?
a) Petroleum refineries
b) Organic chemical manufacture
c) Food processing
d) Paper and pulp manufacture
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Explanation: The production of organic chemicals is a primary source of the emission of organic vapours. Organic materials are easy to volatilise even under low temperatures, thus, forming vapours of organic matter easily.
6. Which of the following are not prime sources of sulphur dioxide?
a) Ore processing
b) Coal-fired power plants
c) Paper manufacture
d) Fertiliser
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Explanation: Since many ores are present in sulphite forms, many ore processing industries release sulphur dioxide. Combustion is a prime source of sulphur dioxide. Pulping processes use sulphur salts.
7. Which of the following is a principal natural source of hydrogen sulphide?
a) Power plants
b) Swamps
c) Volcanic eruptions
d) Petroleum refineries
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Explanation: A principal natural source of hydrogen sulphide is marches and swamps. Volcanic eruptions are also a source of hydrogen sulphide, but not significant and continuous as the primary source.
8. Which of the following industries is a prime source of hydrogen sulphide?
a) Paper manufacturing
b) Fertilisers
c) Pesticides
d) Power generation
View Answer
Explanation: A prime industrial source of hydrogen sulphide is paper manufacture, especially the kraft pulping process. Other industries that release hydrogen sulphide include petroleum refining and manufacture of chemicals.
9. Which of the following is a principal industrial source of hydrogen fluoride?
a) Paper manufacture
b) Food processing
c) Petroleum refinery
d) Phosphate fertiliser manufacture
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Explanation: Aluminium and fertiliser manufacture are principal industrial sources of hydrogen sulphide. Even small amounts of hydrogen sulphide have very adverse effects on flora and fauna in nature.
10. All chlorine-containing air pollutants are in gaseous form.
a) True
b) False
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Explanation: Most chlorine-containing air pollutants are in gaseous in nature, but this is not true for all. Inorganic chlorides (ex. sodium chloride) are solids and get suspended in the atmosphere as solid particulates.
11. Which of the following industrial chlorinated gases pollute the air?
a) Hydrogen chloride
b) Chlorine
c) Sodium chloride
d) Terpenes
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Explanation: Hydrogen chloride, chlorine, and terpenes are examples of industrial chlorinated gases which pollute the air. Sodium chloride is solid in nature, and it will be a particulate air pollutant. Sodium chloride is also a natural pollutant.
12. Which of the following is not a source of carbon monoxide?
a) Paper and pulp manufacture
b) Organic chemicals manufacture
c) Petroleum refineries
d) Combustion
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Explanation: All the given options, except paper and pulp manufacture, causes the release of carbon monoxide. Carbon monoxide is a significant product released during the combustion of fossil fuels for power generation.
13. Which of the following is not a sub-category of food and agriculture air pollutant source?
a) Food processing
b) Fertiliser manufacture
c) Crop spraying
d) Field burning
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Explanation: Food and agriculture sources contain the practice of farming and food processing. Fertiliser manufacture does not fall into agricultural practices, but into inorganic chemical production.
14. Which of the following chemical manufacture is primarily responsible for NOX emission?
a) Nitrous oxide
b) Fertiliser manufacture
c) Nitric acid
d) Sulphuric acid
View Answer
Explanation: Nitric acid manufacture gives rise to many types of nitrogen oxides. The absorption and oxidation stages during the manufacture of nitric acid, are major contributors to the formation of NOx.
15. Which of the following nitrogen oxides are classified as pollutants?
a) Nitrous oxide
b) Dinitrogen trioxide
c) Dinitrogen tetraoxide
d) Nitrogen dioxide
View Answer
Explanation: Only nitrogen dioxide and nitric oxide are released in high enough quantities, and get categorised as air pollutants. Usually, recovery operations collect most of the nitrogen oxides in the effluent streams.
Sanfoundry Global Education & Learning Series – Pollution Control.
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