Physics Vectors & Equilibrium PMDC Conceptual Practice
PMDC Verified Question 20 of 50
Which of the following objects has every point on its surface equidistant from its center of gravity?
A
An egg
B
A cubic box
C
A triangular prism
D
A table tennis ball
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: A table tennis ball
Concept:
Uniform mass distribution, geometric centers, and centers of gravity of regular shapes.

Solution:
A table tennis ball is highly spherical and has a uniform mass distribution. For a uniform sphere, the center of gravity coincides with its geometric center. Because every point on the surface of a sphere is equidistant from its center, the table tennis ball perfectly satisfies this property.

Why other options are incorrect:
  • An egg is ellipsoidal, so surface points at the poles are further from the center of gravity than points at the equator.
  • A cubic box and a triangular prism have vertices and flat faces, meaning corners are much further from the center of gravity than the center of the faces.

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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