Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

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Hydraulics and Fluid Mechanics in ME
The total head of a liquid particle in motion is equal to

Potential head - (pressure head + kinetic head)
Pressure head - (kinetic head + potential head)
Pressure head + kinetic head + potential head
Kinetic head - (pressure head + potential head)

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