The GATE Grind

GATE 2023 MT – Question 19

Materials Science and Non-Metallic Materials · Crystal structures and bonding · 1 mark · Multiple choice

Diamond has low

  1. electrical conductivity
  2. modulus of elasticity
  3. hardness
  4. thermal conductivity

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Show answer and explanation

Correct answer: (A) electrical conductivity

Explanation

Strong covalent bonds give diamond high hardness and elastic modulus, and its lattice transports heat efficiently. Its wide electronic band gap leaves very few mobile charge carriers in pure diamond.

Therefore its **electrical conductivity, A**, is low.