Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · IndustriesMedium · 45s
Which is the oldest oil refinery in India?
TopicIndustries
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Digboi Refinery in Assam is the oldest, operational since 1901.
Final Answer: Option A — Digboi