Question

Stream line, path line and streak line are identical when the

• A. Flow is steady
• B. Flow is uniform
• C. Flow velocities do not change steadily with time
• D. Flow is neither steady nor uniform

Answer 1

Answer:

A. Flow is steady

Streamlines, streaklines, and pathlines are different ways of representing the movement of fluid particles. Streamlines show the direction of a fluid element at any point, streaklines show the path of all fluid particles that have passed through a specific point, and pathlines show the trajectory of an individual fluid particle. They all coincide in steady flow.