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The origin is called as _________

(a) singular point

(b) multiple point

(c) sink point

(d) source point

This question was addressed to me in a job interview.

Asked question is from Source Flow topic in chapter Inviscid & Incompressible Flow of Aerodynamics

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The correct option is (a) singular point

To explain: For a source flow, divergence of velocity is zero everywhere expect at the origin where it is infinite. Thus, the origin is a singular point and we can interpret this singular point as a discrete source or sink of a given strength, with a corresponding induced flow field about the point.

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