Hydraulic and Fluid Mechanics

81. According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

1. A × M × m^1/2 × i^2/3
2. A × M × m^2/3 × i^1/2
3. A^1/2 × m^2/3 × m × i
4. A^2/3 × M^1/3 × m × i

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82. According to Newton's law of viscosity, the shear stress on a layer of a fluid is

1. Equal to
2. Directly proportional
3. Inversely proportional
4. None of these

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83. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

1. The weight of the body
2. More than the weight of the body
3. Less than the weight of the body
4. Weight of the fluid displaced by the body

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84. Alcohol is used in manometers because

1. It has low vapour pressure
2. It is clearly visible
3. It has low surface tension
4. It can provide longer column due to low density

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85. All the terms of energy in Bernoulli's equation have dimension of

1. Energy
2. Work
3. Mass
4. Length

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86. An air vessel is provided at the summit in a siphon to

1. Avoid interruption in the flow
2. Increase discharge
3. Increase velocity
4. Maintain pressure difference

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87. An average value of coefficient of velocity is

1. 0.62
2. 0.76
3. 0.84
4. 0.97

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

1. 1%
2. 1.5 %
3. 2 %
4. 2.5 %

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89. 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,

1. 1 %
2. 1.5 %
3. 2 %
4. 2.5 %

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90. An ideal flow of any fluid must fulfill the following

1. Newton's law of motion
2. Newton's law of viscosity
3. Pascal' law
4. Continuity equation

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