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 · Units and DimensionsMedium · 45s
Which one is a dimensionless constant?
TopicUnits and Dimensions
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.
Avogadro's Number is simply a count (6.022×10²³).
Final Answer: Option A — Avogadro Number