Physics Vectors & Equilibrium PMDC Conceptual Practice
PMDC Verified Question 21 of 50
A unit vector is primarily used in physics to specify which of the following properties?
A
The direction of a vector
B
The magnitude of a vector
C
The angle of a vector with the origin
D
The position of a vector in space
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: The direction of a vector
Concept:
The purpose of unit vectors.

Solution:
Unit vectors have a magnitude of exactly 1. Multiplying any scalar value by a unit vector assigns a direction to that value without changing its magnitude. Thus, they are used to describe direction.

Why other options are incorrect:
  • B is incorrect because the magnitude of a unit vector is always fixed at 1, so it cannot describe the variable magnitude of other vectors.
  • C and D are incorrect because a unit vector alone does not specify position in space or reference angles.

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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