Which one shows anisotropic behavior?
Correct answer: D. Graphite
- A. Wood
- B. Gemstone
- C. Coke
- D. Graphite
Explanation
This is the option marked correct in the official UHS answer key. Graphite is crystalline with a strongly layered structure, so properties such as electrical conductivity differ enormously along the layers compared with across them, which is the essence of anisotropy. Coke is amorphous and therefore isotropic. Note that gemstones are crystalline and anisotropic too, and wood is anisotropic in the everyday sense of grain, so this question rests on the crystalline definition.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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