Physics Rotational & Circular Motion NUMS 2024
PMDC Verified Question 21 of 95
For anti-clock wise rotation the angular displacement is:
A
Negative
B
Positive
C
Null
D
Zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Positive
Concept:

By applying the right-hand rule to a 2D Cartesian plane (x-y axis), we establish the universal mathematical sign convention for rotation.

Solution:

  • If an object rotates anti-clockwise (counter-clockwise) on a piece of paper, your right fingers curl with the motion, and your thumb points directly UP toward your face (positive z-axis).
  • Therefore, in mathematics and physics, anti-clockwise rotation is universally defined as Positive.
  • Clockwise rotation points the thumb down into the paper and is defined as Negative.


Why other options are incorrect:

  • Option A represents clockwise rotation.
  • Option C and Option D imply the object has not rotated at all.

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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