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An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is 1mm at a location where the Reynolds number is 1000. If the velocity of the fluid alone is increased by a factor of 4, then the boundary layer thickness sat the same location, in mm will be                                   

      (a) 4                                (b) 2                             (c) 0.5                             (d) 0.25

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