Question

The smoke particles coming out from the chimney falls under ____________

(a) Streamline

(b) Streakline

(c) Path line

(d) Position vector

I have been asked this question during an interview for a job.

Question is taken from Pathlines, Streamlines, Streaklines in chapter Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

The correct answer is (b) Streakline

To explain I would say: Streakline is defined as the locus of the particle that has earlier passed through the fixed point. In the case of the chimney, the chimney is the fixed point and the smoke which passes through it makes the locus. The path of the smoke can be traced.