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 · MineralsMedium · 45s
Which of the following is NOT an ore?
TopicMinerals
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.
Calcite is a mineral, not an ore. Bauxite (aluminium), galena (lead), haematite (iron) are ores.
Final Answer: Option D — Calcite