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Topic Greenhouse Effect
Asked 3 times across 3 UPSC exams over 2 years (2023–2025), peaking in 2025.
Key insights
- Most tested in CSE — 1 of 3 PYQs
- First appeared in NDA 2023 — 2 years before CSE 2025 (allied exams preview CSE)
- Most asked in 2025
- Recurs across 2 years (2023–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
NDA 2023 → CSE 2025 → CAPF 2025
How the concept evolved
Rising — more than half its appearances (3 of 3) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CSE2025
Consider the following statements
- Without the atmosphere, temperature would be well below freezing point everywhere on the Earth's surface
- Heat absorbed and trapped by the atmosphere maintains our planet's average temperature
- Atmosphere's gases, like carbon dioxide, are particularly good at absorbing and trapping radiation
Which of the statements given above are correct?
- A I and III only
- B I and II only
- C I, II and III ✓
- D II and III only
✓ Correct answer: (C)
Geography › Climatology
CAPF2025
Which one among the following is not a greenhouse gas?
- A Sulphur dioxide
- B Methane
- C Nitrous oxide
- D Fluorinated gas
Answer key not yet available (pending official release)
Environment & Ecology › Climate Change
NDA2023
Which one of the following is not a main greenhouse gas?
- A Water vapour
- B Oxygen ✓
- C Carbon dioxide
- D Methane
✓ Correct answer: (B)
Environment & Ecology › Climate Change
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