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- Subject
- Chemical Environmental Engineeringchemical-engineering › chemical-environmental-engineering-chemical-engineering
- Published
- 11 Mar 2019
- Last updated
- 28 May 2026
Explanation
Options A, B, and C all describe natural processes that contribute to air pollution. Therefore, none of these options are unnatural sources, making option D the correct choice.
More Chemical Environmental Engineering MCQs
Practice related questions from the same subject.
- 1.Which type of plant releases a significant quantity of sulfur dioxide (SO2) into the atmosphere?
- 2.What is the primary source of carbon monoxide pollution in the atmosphere, given that its safe threshold limit value (TLV) is below 50 ppm?
- 3.Which material is commonly utilized as an adsorbent to eliminate SO2 from air or gas streams?
- 4.What is the recommended method for disposing of solid radioactive nuclear waste?
- 5.At what minimum concentration percentage does nitrogen in polluted air function as a natural asphyxiant by lowering the oxygen partial pressure in the lungs, leading to suffocation and potential death due to oxygen deprivation?
- 6.The presence of manganese in water encourages the proliferation of which of the following?
- 7.What is the approximate pH level of treated (oxidized) sewage?
- 8.In which of the following industries is arsenic pollution not produced?
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