Which one of the following statements is not correct ?

- 1
  
  In free vortex flow, streamlines are concentric spirals and flow continuously circles the origin.
- 2
  
  In free vortex flow, the flow velocity is in tangential direction only and varies inversely as the distance from the origin.
- 3
  
  In a free vortex, flow is rotational at the core and irrotational away from it.
- 4
  
  In a forced vortex, flow is rotational, that is, fluid particles undergo rotation about their mass centre.

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