Physics Rotational & Circular Motion ETEA 2022
PMDC Verified Question 56 of 95
Which one is not a vector quantity?
A
Angular displacement
B
Impulse
C
Moment of inertia
D
Momentum
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Moment of inertia
Concept:

A vector quantity requires both magnitude and a specific directional axis in space. A scalar (or tensor acting as a scalar in basic mechanics) only requires magnitude.

Solution:

  • Moment of inertia relates mass distribution to an axis, but mathematically, it does not point in a direction. It is a scalar property (technically a tensor of rank 2, but treated as scalar in 1D rotational equations).
  • Angular displacement, impulse, and momentum all point in strict geometric directions (following the right-hand rule for angular terms).


Why other options are incorrect:

  • Option A, Option B, Option D are explicitly classified as vectors in introductory physics.

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