Q. A flow is called sonic, if the Mach number is unity.

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Q. An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,

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Q. A flow through a long pipe at decreasing rate is called __________ uniform flow.

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Q. The surface tension of mercury at normal temperature is __________ that of water.

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Q. The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)

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Q. The pressure intensity in kN/m² (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

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Q. The hydraulic gradient line is always parallel to the centre line of the pipe.

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Q. Barometer is used to measure

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Q. A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.

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Q. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure

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Q. The specific weight of compressible fluids does not remain constant.

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Q. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

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Q. In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere.

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Q. Newton's law of viscosity is a relationship between

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Q. The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)

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Q. The viscosity of water at 20°C is

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Q. The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation.

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Q. The discharge through a channel of rectangular section will be maximum, if

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Q. When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

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Q. The property of a liquid which enables it to resist tensile stress is called its surface tension.

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