Hydraulics & Fluid Mechanics
For measuring flow by a venturimeter, if should be installed in

horizontal line
inclined line with upward flow
vertical line
in any direction and in any location.

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

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

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Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot remain at rest under action of any shear force
always expands until it fills any container
cannot be subjected to shear forces
has the same shear stress.at a point regardless of its motion

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