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Important Questions on Friction in Solids and Liquids

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Bernoulli's principle is true under which of the following (conditions) assumptions?
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In case of the streamline flow of non-viscous and incompressible fluid, which of the following statement is correct?
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If P is the pressure on a liquid of area A and the liquid moves through a certain distance then work done per unit volume is______ .
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The velocity of efflux of liquid through orifice is equal to velocity which a body attains while falling freely from the free surface of liquid to the orifice. This is known as
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A cylinder of height 20 m is completely filled with water. The velocity (in m s-1) of efflux of water through a small hole on the side of cylinder near bottom is
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In a vessel containing water, a hole is made at a depth of  0.10 m from the free surface. What would be the velocity of efflux?
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The device used to measure the rate of flow of incompressible fluid in steady state is _______ .