Fluid Mechanics
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.

U-tube water
Inclined tube mercury
U-tube mercury
Inclined tube water

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Friction co-efficient for flows at equal Reynold number
Absolute roughness
All of these
Relative roughness

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