Topic Methane
Asked 3 times across 2 UPSC exams over 14 years (2008–2022), peaking in 2022.
Key insights
- Most tested in CSE — 2 of 3 PYQs
- Most asked in 2022
- Recurs across 3 years (2008–2022)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 2008 → NDA 2020
How the concept evolved
Rising — more than half its appearances (2 of 3) 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.
CSE2022
Among the following crops, which one is the most important anthropogenic source of both methane and nitrous oxide?
- A Cotton
- B Rice ✓
- C Sugarcane
- D Wheat
✓ Correct answer: (B)
Environment & Ecology › Climate Change
NDA2020
Which one of the following is the largest composition in biogas ?
- A Carbon dioxide
- B Methane
- C Hydrogen
- D Hydrogen sulphide ✓
✓ Correct answer: (D)
Science & Technology › Energy & Nuclear
CSE2008
Consider the following: (2008)
- Rice fields
- Coal mining
- Domestic Animals
- Wetlands
Which of the above are sources of methane, a major greenhouse gas?
- A 1 and 4 only
- B 2 and 3 only
- C 1, 2 and 3 only
- D 1, 2, 3 and 4 ✓
✓ Correct answer: (D)
Environment & Ecology › Climate Change
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