Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

It involves lesser excavation for the designed amount of discharge
It has minimum wetted perimeter
All of these
It gives maximum discharge for a given cross-sectional area and bed slope

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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

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

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