Hydraulics & Fluid Mechanics
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

between 1 and 100
160
less than 1
200

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Hydraulics & Fluid Mechanics
True one-dimensional flow occurs when

the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the magnitude and direction of the velocity do not change from point to point in the fluid
the direction and magnitude of the veiocity at all points are identical
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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