421. The flow in a pipe is turbulent when Reynold number is
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422. When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
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423. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
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424. When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of
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425. The hydraulic mean depth or the hydraulic radius is the ratio of
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426. The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as
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427. Stoke is the unit of
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