Sweet vs Sour Crude – Differences, Sulphur Content & UPSC GS3 Notes

Context

India’s trade delegation visit to the U.S. (Feb 23–25) for an Interim Trade Agreement was postponed. The deal would influence India’s import tariffs, including U.S. crude oil (≈10% of India’s oil imports).

Sweet vs Sour Crude

Sweet Crude

  • Low sulphur content (<0.5%)
  • Cleaner burning
  • Cheaper to refine
  • Usually costlier in market due to demand

Sour Crude

  • High sulphur (>1%)
  • Requires more refining
  • Cheaper to buy but costly processing
  • Contains more impurities

Previous Year Question (2011)

“Brent crude oil” refers to:

  1. Major classification of crude oil
  2. Sourced from North Sea
  3. Does not contain sulphur

Correct Answer: B (1 and 2 only)

PYQ – 2024, Ans – D
PYQ – 2011, Ans – B
About the UPSC Civil Services Examination (UPSC CSE)

The UPSC Civil Services Examination (CSE) is one of the most competitive and esteemed examinations in India, conducted by the Union Public Service Commission to recruit officers for services such as the Indian Administrative Service (IAS), Indian Police Service (IPS), Indian Foreign Service (IFS), and others. The exam comprises three stages — Prelims, Mains, and the Personality Test (Interview) — designed to test a candidate’s knowledge, aptitude, decision-making, and leadership skills.


How to Prepare Effectively for UPSC CSE

Cracking the UPSC CSE requires a deep understanding of the syllabus, consistent revision, structured answer writing, and smart test-taking strategies. The Prelims test analytical and conceptual clarity, the Mains focuses on critical thinking, articulation, and subject mastery, while the Interview assesses presence of mind, ethical judgment, and personality traits relevant to public service.

At UnderStand UPSC, we empower aspirants with a personalized and focused approach to each stage of the exam.


Why Choose UnderStand UPSC?

UnderStand UPSC is a mentorship-driven platform offering a clear, clutter-free strategy to tackle the Civil Services Examination. Our programs like Transform (for beginners and intermediate learners) and Conquer (for advanced mains preparation) provide structured study plans, syllabus-wise video content, interactive live sessions, and answer writing support.

We emphasize:

  • Concept clarity through topic-wise lectures

  • Test series designed around real UPSC standards

  • Personalized mentorship in small groups

  • Regular performance tracking and peer benchmarking

  • Doubt-clearing sessions, current affairs analysis, and monthly magazines


Join the UnderStand UPSC Learning Community

Our mission is to make UPSC preparation less overwhelming and more strategic. We combine mentorship, discipline, and academic rigor to help you clear CSE with confidence. Whether you’re preparing from Delhi, Mumbai, Bangalore, or a remote village — our online-first model ensures quality guidance reaches every corner of India.

Join the thousands of aspirants who trust UnderStand UPSC to guide their journey toward becoming civil servants.

Stay connected with us through our Telegram, YouTube, and Instagram channels for daily tips, strategies, and updates.

Copyright © 2026 USARAMBHA EDUCATION (UnderStand UPSC). All Rights Reserved.

Join the Success Journey!