Allied & ICAR Exam Bank • ALLIED_2143 NAT • 1 Mark

Section 8: General Aptitude

Analytical & Spatial Aptitude

Subtopic: Spatial Reasoning & 3D Representations

Question Statement:

A solid rubber block has 3 separate non-intersecting cylindrical holes drilled completely through it from top to bottom. What is the topological genus g of this object?

Answer Key:

3

Step-by-Step Solution & Explanation

Each independent through-hole adds 1 to the genus: genus g = 3.
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