Hydraulics and Fluid Mechanics in ME
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

It is easier to see through the glass tube
All of these
Glass tube is cheaper than a metallic tube
It is not possible to conduct this experiment with any other tube

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Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
Loss of head in the orifice to the head of water available at the exit of the orifice

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