Mains Answer Writing - 20 Jan, 2026

GS3

Science & Technology

10 marks

What is the Greenwald limit in nuclear fusion research? Why is China’s EAST fusion reactor achieving stable plasma density beyond this limit considered important?

Attempt Challenge on App See Model Answer

Tips for your answer

Define first, in one line: Begin by clearly explaining the Greenwald limit as the maximum safe plasma density in a tokamak beyond which plasma becomes unstable.
Link to fusion feasibility: Briefly state why higher plasma density is crucial for fusion—more collisions, higher energy output, and progress towards sustained fusion.
Highlight significance, not details: Focus on why EAST’s achievement matters (breaking a long-standing design barrier, improving prospects of viable fusion energy), without going into excessive technical depth.

6.5/10

Topper’s Answer Sheet

With detailed evaluation

More Challenges

View All

GS3
Science & Technology
12 Oct, 2026
As Artificial Intelligence becomes increasingly autonomous, concerns about its safety and reliability are growing. Discuss the major risks associated with autonomous AI systems and suggest measures for their safe and responsible development.
View Challenge
GS4
Ethics: Theory
Yesterday
What is probity in governance? Explain its importance in public administration with suitable examples.
View Challenge
GS2
International Relations
10 Oct, 2026
Recent restrictions on H-1B visas by the United States have raised concerns for Indian professionals. Discuss their implications for India and suggest measures to address these challenges.
View Challenge