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Topic Persistent pollutants
Asked 2 times in CSE over 37 years (1987–2024), peaking in 2024.
Key insights
- Most tested in CSE — 2 of 2 PYQs
- Most asked in 2024
- Recurs across 2 years (1987–2024)
Across exams
CSE · 2How the concept evolved
Long-running — most appearances (1 of 2) predate 2016, and it still returns.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CSE2024
With reference to perfluoroalkyl and polyfluoroalkyl substances (PFAS) that are used in making many consumer products, consider the following statements
- PFAS are found to be widespread in drinking water, food and food packaging materials
- PFAS are not easily degraded in the environment
- Persistent exposure to PFAS can lead to bioaccumulation in animal bodies
Which of the statements given above are correct ?
- A 1 and 2 only
- B 2 and 3 only
- C 1 and 3 only
- D 1, 2 and 3 ✓
✓ Correct answer: (D)
Environment & Ecology › Pollution & Waste
CSE1987
Why DDT is banned in western countries?
- A It remains in environment for a long time ✓
- B The insects are immunised
- C It is a highly poisonous insecticide
- D None of the above
✓ Correct answer: (A)
Environment & Ecology › Pollution & Waste
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