Physics Rotational & Circular Motion NUMS 2024
PMDC Verified Question 16 of 95
The velocity of an object revolving in circle is:
A
Constant
B
Variable
C
Zero
D
Negative
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Variable
Concept:

Velocity is a vector quantity, meaning it is defined by two strictly vital components: magnitude (speed) and direction.

Solution:

  • Even if the object's speed (magnitude) remains perfectly constant, its path is circular.
  • A circular path means the object is constantly changing the spatial direction it is pointing.
  • Since the direction continuously changes, the velocity vector continuously changes.
  • Therefore, velocity is considered variable.


Why other options are incorrect:

  • Option A incorrectly conflates scalar 'speed' with vector 'velocity'.
  • Option C implies the object isn't moving.
  • Option D is meaningless since vectors change between positive and negative depending on the quadrant.

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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