Solved UPSC CDS/OTA Question
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Q · Longitudemedium · 45s
What is the reference line for measuring longitude?
TopicLongitude
Question Typemultiple choice
Difficultymedium
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
The Prime Meridian at Greenwich is the reference for longitude measurements.
Final Answer: Option C - Prime Meridian