Question

Which of the following is correct?

(a) In steady flow, pathlines and streamlines are identical

(b) In steady flow, pathlines and streaklines are identical

(c) In steady flow, streaklines and streamlines are identical

(d) In steady flow, pathline, streamlines and streaklines are all identical

The question was asked in an interview for job.

My enquiry is from Types of Flow Lines in section Kinematics of Flow and Ideal Flow of Fluid Mechanics

Answer 1

Correct option is (d) In steady flow, pathline, streamlines and streaklines are all identical

For explanation I would say: In case of a steady flow, the velocity at a point remains constant with time. Thus, there will be no geometrical distinction between the pathlines, streamlines and streaklines.