A given shaped glass tube having uniform cross section is f…

Physics Fluid Mechanics Pressure and Density MCQ (Single Correct)

A given shaped glass tube having uniform cross section is filled with water and is mounted on a rotatable shaft as shown in figure. If the tube is rotated with a constant angular velocity then

Water levels in both sections A and B go up

Water level in Section A goes up and that in B comes down

Water level in Section A comes down and that in B it goes up

Water levels remains same in both sections

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The correct answer is:

According to Bernoulli's principle

At the sides the velocity is higher, so the pressure is lower. But the pressure at a given horizontal level must be equal therefore the liquid rises at the sides to some height to compensate for this drop in pressure.

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