the image above shows an inverted U-tube with the open end, O of one limb...

JAMB 1983

the image above shows an inverted U-tube with the open end, O of one limb below the level, W of water in the tank, in order that water should begin to flow from the tank it is is necessary that

A. The U-tube is completely filled with water and that P should be higher that W
B. P should be lower than O and W
C. P should be lower than W and O should reach the botton of the table
D. The U-tube is completely filled with water and that P should be lower that W

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Correct Answer: Option D

Explanation

For water to begin flowing from the tank through an inverted U-tube with an open end at point P, the U-tube must be completely filled with water, and the pressure at point O inside the tube should be lower than the water level W in the tank.

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