Hydraulics & Fluid Mechanics
Select the correct statement

Local atmospheric pressure is always below standard atmospheric pressure
Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
Local atmospheric pressure depends upon elevation of locality only
A barometer reads the difference be-tween local and standard atmospheric pressure

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

product of pressure intensity at its centroid and area
force on a vertical projection of the curved surface
weight of liquid vertically above the curved surface
force on the horizontal projection of the curved surface

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Hydraulics & Fluid Mechanics
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and directly proportional to pipe wall roughness
directly proportional to Reynolds number and independent of pipe wall roughness
directly proportional to pipe wall roughness and independent of Reynolds number
inversely proportional to Reynolds number and indpendent of pipe wall roughness

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