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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-7 section-3

Each section contains 100 MCQs on Hydraulics and Fluid Mechanics .
61
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
62
The center of pressure of a surface subjected to fluid pressure is the point
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
63
Surface tension
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
64
The normal stress in a fluid will be constant in all directions at a point only if
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
65
A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is
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Answer & Solution
Answer: Option B
Solution:
Understanding the Problem:
Imagine a wooden block floating in a swimming pool. The block is partially submerged; only a portion of it is underwater.
The question asks us to find the weight of this block.

Key Concept: Buoyancy
When an object floats, the upward force of the water (called buoyant force) equals the weight of the object.
The buoyant force is equal to the weight of the water displaced by the submerged part of the object.

Calculations:
1. Find the volume of water displaced:
The block is submerged to a depth of 0.5 m. The area of the submerged part is length x width = 2 m x 1 m = 2 m².
The volume of water displaced is area x depth = 2 m² x 0.5 m = 1 m³

2. Calculate the weight of the displaced water:
Water weighs 10 kN/m³. Therefore, the weight of 1 m³ of water is 1 m³ x 10 kN/m³ = 10 kN

3. Determine the weight of the block:
Since the block is floating, the weight of the block equals the buoyant force (weight of the displaced water).
Therefore, the weight of the block is 10 kN

Correct Answer:
The correct option is B: 10 kN
66
A floating body is said to be in a state of stable equilibrium
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Answer & Solution
Answer: Option B
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67
A body floats in stable equilibrium
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Answer: Option B
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68
Metacentric height for small values of angle of heel is the distance between the
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Answer: Option B
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69
If no resistance is encountered by displacement, such a substance is known as
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Answer & Solution
Answer: Option D
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70
The volumetric change of the fluid caused by a resistance is known as
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Answer & Solution
Answer: Option C
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