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In a one-dimensional flow, the volume integral becomes __________

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In a one-dimensional flow, the volume integral becomes __________

(a) a line integral

(b) an area integral

(c) a surface integral

(d) a surface integral and the Gauss divergence theorem

I had been asked this question in examination.

I'm obligated to ask this question of Finite Volume Method in division Finite Volume Methods of Computational Fluid Dynamics

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Correct answer is (a) a line integral

For explanation: For a one-dimensional flow, the volume of the control volume (cell) is in a single dimension which is the length of that cell. So, there will be no need for a volume, area or surface integrals. It is enough to integrate over the length of that cell.

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