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GATE 2025 Chemical Engineering, Q19 · Fluid Mechanics

The correct answer is A, All three lines are identical.

Question

Choose the CORRECT option for pathlines, streaklines and streamlines for a STEADY flow field.

  • A. All three lines are identical
  • B. Only pathlines and streaklines are identical
  • C. Only pathlines and streamlines are identical
  • D. Only streamlines and streaklines are identical

Official answer: All three lines are identical

Why

GATE 2025 official key: (A). In steady flow, the velocity field doesn't change with time, so pathlines, streaklines, and streamlines all coincide.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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