Allied & ICAR Exam Bank • ALLIED_1504 MCQ • 1 Mark

Section 8: General Aptitude

Analytical & Spatial Aptitude

Subtopic: Spatial Reasoning & 3D Representations

Question Statement:

What is the coordination number (number of nearest neighboring spheres touching any single sphere) in a face-centered cubic (FCC) or hexagonal close-packed (HCP) lattice of identical spheres?

Options:

  • (A) 12
  • (B) 8
  • (C) 6
  • (D) 4

Answer Key:

A

Step-by-Step Solution & Explanation

In close-packed structures (both FCC and HCP), each sphere touches 12 nearest neighbors (6 in its own layer, 3 above, and 3 below).
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