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 · Earth Movement And ImpactMedium · 45s
The 'sidereal day' is:
TopicEarth Movement And Impact
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.
Sidereal day is ~23 hours 56 minutes, shorter due to Earth’s revolution.
Final Answer: Option C — Shorter than a solar day