Hydraulic and Fluid Mechanics

131. Flow occurring in a pipeline when a valve is being opened is

1. Steady
2. Unsteady
3. Laminar
4. Vortex

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132. Flow of water in a pipe about 3 metres in diameter can be measured by

1. Orifice plate
2. Venturimeter
3. Rotameter
4. Pitot tube

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133. Fluid is a substance that

1. Cannot be subjected to shear forces
2. Always expands until it fills any container
3. Has the same shear stress at a point regardless of its motion
4. Cannot remain at rest under action of any shear force

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134. Fluid is a substance which offers no resistance to change of

1. Pressure
2. Flow
3. Shape
4. Volume

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135. For a body floating in a liquid the normal pressure exerted by the liquid acts at

1. Bottom surface of the body
2. C.G. of the body
3. Metacentre
4. All points on the surface of the body

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136. For a floating body to be in equilibrium

1. Meta centre should be above e.g.
2. Centre of buoyancy and e.g. must lie on same vertical plane
3. A righting couple should be formed
4. All of the above

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137. For a floating body to be in stable equilibrium, its metacentre should be

1. Below the center of gravity
2. Below the center of buoyancy
3. Above the center of buoyancy
4. Above the center of gravity

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138. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

1. Continuity equation
2. Bernoulli's equation
3. Pascal's law
4. Archim

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139. For hypersonic flow, the Mach number is

1. Unity
2. Greater than unity
3. Greater than 2
4. Greater than 4

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140. For manometer, a better liquid combination is one having

1. Higher surface tension
2. Lower surface tension
3. Surface tension is no criterion
4. High density and viscosity

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