The GATE Grind

GATE 2025 MT – Question 13

Physical Metallurgy · Crystal defects and interfaces · 1 mark · Multiple choice

Match each crystal defect in Column I with its corresponding type in Column II.

Column I:

P. Edge dislocation

Q. Stacking fault

R. Frenkel defect

S. Porosity

Column II:

1. Zero-dimensional defect

2. One-dimensional defect

3. Two-dimensional defect

4. Three-dimensional defect

  1. P – 3, Q – 4, R – 2, S – 1
  2. P – 3, Q – 4, R – 1, S – 2
  3. P – 2, Q – 3, R – 1, S – 4
  4. P – 2, Q – 4, R – 3, S – 1

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Show answer and explanation

Correct answer: (C) P – 2, Q – 3, R – 1, S – 4

Explanation

An edge dislocation is a line defect (1D,2); a stacking fault is planar (2D,3). A Frenkel vacancy–interstitial pair is classified as point defects (0D,1), while porosity occupies a volume (3D,4). Hence **P2,Q3,R1,S4, C**.