Topic Biofuels
Asked 9 times across 3 UPSC exams over 43 years (1982–2025), peaking in 2024.
Key insights
- Most tested in CSE — 7 of 9 PYQs
- Most asked in 2024
- Recurs across 8 years (1982–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1982 → CDS 2022 → ESE 2024
How the concept evolved
Rising — more than half its appearances (7 of 9) 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.
CSE2025
Consider the following statements
Statement IOf the two major oil producers in the world, i.e., Brazil and the United States of America, the former produces more ethanol than the latter
Statement IIUnlike in the United States of America where corn is the principal feedstock for ethanol production, sugarcane is the principal feedstock for ethanol production in Brazil
Which one of the following is correct in respect of the above statements?
- A Both Statement I and Statement II are correct and Statement II explains Statement I
- B Both Statement I and Statement II are correct but Statement II does not explain Statement I
- C Statement I is correct but Statement II is not correct
- D Statement I is not correct but Statement II is correct ✓
✓ Correct answer: (D)
Economy › External Sector & Trade
CSE2024
Consider the following materials
- Agricultural residues
- Corn grain
- Wastewater treatment sludge
- Wood mill waste
Which of the above can be used as feedstock for producing Sustainable Aviation Fuel ?
- A 1 and 2 only
- B 3 and 4 only
- C 1, 2, 3 and 4 ✓
- D 1, 3 and 4 only
✓ Correct answer: (C)
Science & Technology › Energy & Nuclear
ESE2024
Consider the following statements about ethanol
- Ethanol is primarily produced from corn and sugarcane
- Ethanol provides a major part of the liquid fuel requirement in Brazil
- The production of ethanol accounts for around 90% of the production of biofuels in the world
Which of the above statements is/are correct?
- A 1, 2 and 3 ✓
- B 2 and 3 only
- C 3 only
- D 1 and 2 only
✓ Correct answer: (A)
Science & Technology › Energy & Nuclear
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