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GATE 2026 PI – Question 21

General Engineering · Applied Mechanics · 1 mark · Multiple choice

The ratio of hydrostatic stress to volumetric strain is called ______.

  1. Bulk modulus
  2. Compressibility
  3. Poisson’s ratio
  4. Young’s modulus

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Correct answer: (A) Bulk modulus

Explanation

The bulk modulus measures resistance to uniform volume change: $K=-p/(\Delta V/V)$ under the usual compression sign convention. Compressibility is its reciprocal; Young’s modulus relates axial stress to axial strain. **A**.

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