Physics Rotational & Circular Motion PMDC 2021
PMDC Verified Question 74 of 95
Earth completes one revolution about its own axis
A
24 hours
B
6 months
C
12 months
D
None
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 24 hours
Concept:

In astronomy, 'rotation' refers to an object spinning on its own axis, while 'revolution' usually refers to orbiting another body. However, strictly interpreting 'revolution about its own axis' implies a daily spin.

Solution:

  • The Earth completes one full \( 360^\circ \) spin around its own polar axis approximately every 24 hours, resulting in a day-night cycle.


Why other options are incorrect:

  • Option B is half a solar year.
  • Option C is a solar year, which is the time Earth takes to orbit (revolve around) the Sun, not its own axis.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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