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2024 · Q22Environment & EcologyPollution & Waste Managementmoderate

Consider the following statements : Statement-I : Many chewing gums found in the market are considered a source of environmental pollution. Statement-II : Many chewing gums contain plastic as gum base. Which one of the following is correct in respect of the above statements ?

  1. (a)Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
  2. (b)Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
  3. (c)Statement-I is correct, but Statement-II is incorrect
  4. (d)Statement-I is incorrect, but Statement-II is correct
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Official answer(a) Both Statement-I and Statement-II are correct and Statement-II explains Statement-I

2025 · Q50Environment & EcologyPollution & Waste Managementmoderate

Consider the following statements : Statement I : Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries. Statement II : Activated carbon exhibits a large surface area and a strong potential for adsorbing heavy metals. Statement III : Activated carbon can be easily synthesized from environmental wastes with high carbon content. Which one of the following is correct in respect of the above statements?

  1. (a)Both Statement II and Statement III are correct and both of them explain Statement I
  2. (b)Both Statement II and Statement III are correct but only one of them explains Statement I
  3. (c)Only one of the Statements II and III is correct and that explains Statement I
  4. (d)Neither Statement II nor Statement III is correct
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Official answer(a) Both Statement II and Statement III are correct and both of them explain Statement I

2024 · Q17Environment & EcologyPollution & Waste Managementeasy

With reference to perfluoroalkyl and polyfluoroalkyl substances (PFAS) that are used in making many consumer products, consider the following statements : 1. PFAS are found to be widespread in drinking water, food and food packaging materials. 2. PFAS are not easily degraded in the environment. 3. Persistent exposure to PFAS can lead to bioaccumulation in animal bodies. Which of the statements given above are correct ?

  1. (a)1 and 2 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(d) 1, 2 and 3

2022 · Q44Environment & EcologyPollution & Waste Managementmoderate

In the context of WHO Air Quality Guidelines, consider the following statements : 1. The 24-hour mean of PM2.5 should not exceed 15 μg/m3 and annual mean of PM2.5 should not exceed 5 μg/m3. 2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather. 3. PM10 can penetrate the lung barrier and enter the bloodstream. 4. Excessive ozone in the air can trigger asthma. Which of the statements given above are correct ?

  1. (a)1, 3 and 4
  2. (b)1 and 4 only
  3. (c)2, 3 and 4
  4. (d)1 and 2 only
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Official answer(b) 1 and 4 only