Fluid Mechanics
With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)

Increases linearly
Increases exponentially
Remains constant
Decreases

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Fluid Mechanics
A stream line is

Fixed in space in steady flow
Drawn normal to the velocity vector at every point
A line connecting the mid points of flow cross-section
Always the path of particle

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