Chemistry Solids PMC 2021
PMDC Verified Question 44 of 54
Properties due to change of direction are called ____
A
Isotropic properties
B
Anisotropy
C
Symmetry
D
Cleavage plane
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Anisotropy
Concept:
The dependency of physical properties on the crystallographic direction of measurement is a hallmark of crystalline solids.

Solution:
  • When properties like electrical conductivity, refractive index, or thermal expansion vary depending on the angle or direction they are measured within a crystal, this phenomenon is defined as anisotropy.


Why other options are incorrect:
  • A: Isotropic properties remain identical regardless of the direction of measurement (typical of amorphous solids or liquids).
  • C, D: Symmetry relates to structural repetition, and cleavage planes are the physical planes where crystals break cleanly.

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