Hydraulics and Fluid Mechanics in ME
Choose the wrong statement. Alcohol is used in manometer, because

It provides suitable meniscus for the inclined tube
Its vapour pressure is low
It provides longer length for a given pressure difference
Its density is less

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of trapezoidal section is maximum when

The sloping side is equal to the width at the bottom
The sloping side is equal to half the width at the top
Width of channel at the top is equal to twice the width at the bottom
Depth of channel is equal to the width at the bottom

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