Hydraulics & Fluid Mechanics
An open vessel of water is accelerated up an inclined plane. The free water surface will

be horizontal
make an angle in direction of inclination of inclined plane
make an angle in opposite direction to inclination of inclined plane
any one of above is possible

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Hydraulics & Fluid Mechanics
The normal stress is same in all directions at a point in a fluid

When there is no motion of one fluid layer relative to an adjacent layer
only when the fluid is incompressible and has zero viscosity
only when the fluid is frictionless
irrespective of the motion of one fluid layer relative to an adjacent layer

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