Physics Rotational & Circular Motion SZABMU 2024
PMDC Verified Question 5 of 95
Which one of the following is the SI-unit of angular displacement?
A
Degree
B
Radian
C
Revolution
D
Steradian
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Radian
Concept:

Angular displacement requires a standardized dimensionless unit in the International System (SI) to easily interface with linear kinematics formulas without messy conversion constants.

Solution:

  • The Radian is defined as the ratio of arc length to radius (\( S/r \)). Since it is a ratio of lengths (meters/meters), it is a pure, dimensionless number, making it the mathematically elegant and official SI unit for planar angles.


Why other options are incorrect:

  • Option A and Option C are common practical units but are not the official SI standard.
  • Option D (Steradian) is the SI unit for solid (3D) angles, not standard 2D angular displacement.

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