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Topic Stratosphere
Asked 2 times across 2 UPSC exams over 1 years (2020–2021), peaking in 2020.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2020
- Recurs across 2 years (2020–2021)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2020 → GEO 2021
How the concept evolved
Rising — more than half its appearances (2 of 2) are since 2016.
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.
GEO2021
Which one among the following is true about Ozone Hole?
- A It is the loss of Tropospheric ozone over Antarctica
- B It is the loss of Stratospheric ozone over Antarctica
- C It is a hole in the Antarctic ice sheet created due to ozone
- D It is the loss of equatorial ozone
Answer key not yet available (pending official release)
Environment & Ecology › Pollution & Waste
CDS2020
Which one of the following statements with regard to ozone is not correct?
- A Ozone is found mostly in 15-55 km in the atmosphere.
- B Ozone is produced by gaseous chemical reactions.
- C 16th November is celebrated as the International Day for the Preservation of the Ozone Layer. ✓
- D Ozone is a form of oxygen in which three oxygen atoms are bounded together.
✓ Correct answer: (C)
Environment & Ecology › Pollution & Waste
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