Physics Vectors & Equilibrium PMDC Conceptual Practice
PMDC Verified Question 15 of 50
A null vector is defined as a vector that has:
A
Zero magnitude and a specific direction along the x-axis
B
Unit magnitude and an arbitrary direction
C
Zero magnitude and no specific direction
D
Infinite magnitude and a random direction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Zero magnitude and no specific direction
Concept:
The properties of the null (zero) vector.

Solution:
A null vector (represented as \(\vec{0}\)) is a vector with a magnitude of exactly zero. Because its length is zero, it does not point in any specific direction, and its direction is mathematically defined as arbitrary or undefined.

Why other options are incorrect:
  • A is incorrect because a null vector cannot have any specified direction.
  • B and D are incorrect because they assign non-zero magnitudes (1 and infinity) to the zero vector.

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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