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Hydraulics And Fluid Mechanics MCQ Questions & Answers | Civil Engineering

Learn Hydraulics And Fluid Mechanics MCQ questions & answers are available for a Civil Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Hydraulics And Fluid Mechanics MCQ question is the important chapter for a Civil Engineering and GATE students. Page-9 section-1

Each section contains 100 MCQs on Hydraulics and Fluid Mechanics .
81
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
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Answer & Solution
Answer: Option C
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82
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be
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Answer & Solution
Answer: Option D
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83
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
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Answer & Solution
Answer: Option B
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84
The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)
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Answer & Solution
Answer: Option B
Solution:
In the field of hydraulics and fluid mechanics, a broad-crested weir is employed to manage water flow in open channels. This structure is pivotal for measurement and control purposes. The discharge over such a weir is contingent on the depth of flow, which is referred to as the head over the weir. Various empirical equations govern the relationship between discharge and head.

Among the given options, the correct choice is Option B: $$\frac{{2H}}{3}$$. This signifies that the discharge over a broad-crested weir reaches its maximum when the depth of flow (head) equals two-thirds of the available head (H). This specific proportion maximizes the flow rate of discharge over the weir.

Therefore, the accurate answer is Option B: $$\frac{{2H}}{3}$$.
85
The line of action of the buoyant force acts through the centroid of the
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Answer & Solution
Answer: Option D
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86
Two pipe systems are said to be equivalent when
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Answer: Option A
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87
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
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Answer: Option A
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88
A fluid is said to be ideal, if it is
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Answer: Option D
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89
The horizontal component of force on a curved surface is equal to the
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Answer: Option B
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90
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)
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Answer & Solution
Answer: Option A
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