This set of Pollution Control Multiple Choice Questions & Answers (MCQs) focuses on “Sources and Classification of Air Pollutants – Set 5”.
1. Which of the following is not a primary source of air pollutants from industrial sources?
a) Paper and pulp industry
b) Chemical industry
c) Metallurgical industry
d) Combustion
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Explanation: Combustion sources, along with ore processing, and chemical manufacturing are top sources of air pollutants. Paper and pulp industry, though a contributor, falls into the broader category of chemical industries.
2. Which industry is a prime source of sulphur dioxide?
a) Natural sources
b) Metallurgical operations
c) Chemical manufacture
d) Fertiliser manufacture
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Explanation: Combustion is a prime industrial source of sulphur dioxide, but this option is not listed. Ore processing operations like roasting are other important sources of sulphur dioxide, especially sulphide ores.
3. Incineration releases a variety of pollutants. Which factor controls the kind of pollutants released?
a) The waste to be released
b) The conditions of the process
c) The waste to be disposed
d) The composition of the waste
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Explanation: The constituents of the waste material determines the kind of pollutants released during the incineration process. These pollutants range from carbon dioxide and sulphur dioxide to aldehydes.
4. Which of the following non-metallic mineral processing industries release air pollutants.
a) Glass
b) Zinc
c) Lead
d) Copper
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Explanation: Most non-metallic mineral processing operations release air pollutants. The only non-metallic mineral processing listed is glass. Other examples include cement, ceramic, and refractories.
5. Which of the following is a primary air pollutant source from the steel and iron industry?
a) Washing
b) Sintering
c) Roasting
d) Pickling
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Explanation: The processing of iron ore during the steel processing is a primary reason for the release of air pollutants. Processes and operations like sintering and coke ovens are such sources.
6. Which of the following mineral processing operations does not release hazardous dust?
a) Mining
b) Storage
c) Packaging
d) Crushing
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Explanation: Crushing, mining, storage, and even transport during the processing of minerals result in the release of hazardous dust. Packaging is the only given operation that does not release dust.
7. Manufacture of organic chemicals leads to the formation of which of the following gases?
a) Methanol
b) Xylene
c) Methane
d) Benzene
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Explanation: Industries that manufacture organic materials may release benzene and carbon tetrachloride vapours. Both of these compounds are organic solvents used fairly commonly in industries.
8. Which of the following statements is false about chemical manufacture?
a) Product formation does not release air pollutants
b) Wastewater processing releases air pollutants
c) Processing of raw materials does not release air pollutants
d) Purification of chemicals releases air pollutants
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Explanation: Except for wastewater treatment, all the given options may release air pollutants in some form or capacity. It may be dust or organic fumes or even gases like oxides of metals or sulphur, et cetera.
9. Which process releases particulates in the petroleum refining process?
a) Catalyst regeneration
b) Refining
c) Distillation
d) Stripping
View Answer
Explanation: The process of regeneration and recycling of catalysts release particulates during the processing of chemicals. Stripping releases sulphurous compounds, while refining processes release vapours.
10. Where are sulphurous gases and vapours released from during the pulping process?
a) Recycling
b) Blow tanks
c) Pulping
d) Bleaching
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Explanation: Gases and particulates containing sulphur, like hydrogen sulphide and mercaptans are released from blow tanks. Other sources include evaporators and recovery furnaces, where black liquor recovery takes place.
11. What is the primary natural source of terpenes?
a) Shale oil
b) Petrol
c) Pine tar
d) Marshes
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Explanation: Terpenes are volatile organic compounds (VOCs) that are released primarily from natural sources. Pine tar is an example of a natural source of terpenes. They are also industrially produced.
12. Which of the following does not fall into the air pollutant source category of roasting and heating processes?
a) Non-ferrous ore processing
b) Ferrous ore processing
c) Non-metallic mineral processing
d) Power-plants
View Answer
Explanation: Roasting and heating processes imply that the industry of discussion is the metallurgical industry. All the given options fall into the category of metallurgical industries, except for power plants.
13. Which of the following air pollutants is released from food processing?
a) Odour
b) Mists
c) Ozone
d) Chemicals
View Answer
Explanation: Odours, usually sulphurous compounds, are released from food processing industries. The reason for the formation of odours is the biological decay of edible food. Mists, ozone, and chemicals are not released from food processing industries.
14. Which of the following air pollutants is not released due to field burning?
a) Smoke
b) Mists
c) Fly ash
d) Soot
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Explanation: Field burning is an agricultural practice to prepare for a new harvest. Particulates and other combustion compounds are released during this process; this includes smoke, fly ash and soot.
15. Mineral processing industries release which kinds of particulates during processing?
a) Mists
b) Fly ash
c) Metal oxides
d) Sulphur oxides
View Answer
Explanation: Oxides of sulphur are gaseous in nature. Metal oxides, including zinc, lead, and copper, are released from processing industries as dust and fumes. Additionally, trace metal oxides may also be released.
Sanfoundry Global Education & Learning Series – Pollution Control.
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