Hydrostatic Forces on Surfaces MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Hydrostatic Forces on Surfaces, a fundamental topic in the field of Fluid Mechanics. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Hydrostatic Forces on Surfaces MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Hydrostatic Forces on Surfaces mcq questions that explore various aspects of Hydrostatic Forces on Surfaces problems. Each MCQ is crafted to challenge your understanding of Hydrostatic Forces on Surfaces principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Fluid Mechanics tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Hydrostatic Forces on Surfaces MCQs are your pathway to success in mastering this essential Fluid Mechanics topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Hydrostatic Forces on Surfaces. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Hydrostatic Forces on Surfaces knowledge to the test? Let's get started with our carefully curated MCQs!

Hydrostatic Forces on Surfaces MCQs | Page 4 of 6

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Q31.
A square lamina (each side equal to 2m) is submerged vertically in water such that the upper edge of the lamina is at a depth of 0.5 m from the water surface. If the pressure on the surface is 12 bar, what will be the total water pressure (in kN) on the lamina?

a.

39

b.

59

c.

64

d.

71

Discuss
Answer: (c).64
Q32.
A container is filled with two liquids of densities ฯโ‚ and ฯโ‚‚ up to heights hโ‚ and hโ‚‚ respectively. What will be the hydrostatic force (in kN) per unit width of the lower face AB?

a.

ฯโ‚‚g(hโ‚ + hโ‚‚)

b.

ฯโ‚‚g(hโ‚ + \(\frac{h_2}{2}\))

c.

ฯโ‚‚g(\(\frac{ฯ_1}{ฯ_2}\)hโ‚ + \(\frac{h_2}{2}\))

d.

ฯโ‚‚g(\(\frac{ฯ_1}{ฯ_2}\)hโ‚ + \(\frac{h_2}{2}\))²

Discuss
Answer: (c).ฯโ‚‚g(\(\frac{ฯ_1}{ฯ_2}\)hโ‚ + \(\frac{h_2}{2}\))
Q33.
A container is filled with two liquids of densities ฯ and 2ฯ up to heights h and 2h respectively. What will be the ratio of the total pressure on the lower face AB and on the upper face BC?

a.

1 : 1

b.

3 : 1

c.

2 : 1

d.

3 : 2

Discuss
Answer: (b).3 : 1
Q34.
A container is filled with two liquids of densities ฯ and 2ฯ up to heights h and eh respectively. What will be the ratio of the depths of the centres of pressure of the upper face BC and the lower face AB?

a.

1 : 2

b.

3 : 4

c.

2 : 3

d.

3 : 2

Discuss
Answer: (c).2 : 3
Q35.
A gate of length 5 m is hinged at A as shown to support a water column of height 2.5 m. What should be the minimum mass per unit width of the gate to keep it closed?

a.

3608

b.

4811

c.

7217

d.

9622

Discuss
Answer: (d).9622
Q36.
A large tank is filled with three liquids of densities ฯโ‚, ฯโ‚‚ and ฯโ‚ƒ up to heights of hโ‚, hโ‚‚ and hโ‚ƒ respectively. What will be the expression for the instantaneous velocity of discharge through a small opening at the base of the tank? (assume that the diameter of the opening is negligible compared to the height of the liquid column)

a.

\(\sqrt{2g(h_1 + h_2 + h_3)}\)

b.

\(\sqrt{2g(\frac{ฯ_1h_1+2ฯ_2h_2+3ฯ_3h_3}{ฯ_1})}\)

c.

\(\sqrt{2g(\frac{ฯ_1h_1+\frac{1}{2}ฯ_2h_2+\frac{1}{3}ฯ_3h_3}{ฯ_2})}\)

d.

\(\sqrt{2g(\frac{ฯ_1h_1+ฯ_2h_2+ฯ_3h_3}{ฯ_3})}\)

Discuss
Answer: (d).\(\sqrt{2g(\frac{ฯ_1h_1+ฯ_2h_2+ฯ_3h_3}{ฯ_3})}\)
Q37.
Find the total pressure on a circular plate of diameter 3 m immersed in a fluid of specific gravity 0.75 at a depth of 5 m from the surface on a planet having acceleration dueto gravity 7 m/s².

a.

18.5 N/cm²

b.

37 N/cm²

c.

9.25 N/cm²

d.

None of the mentioned

Discuss
Answer: (a).18.5 N/cm²
Q38.
A rectangular plate surface 3m wide and 5m deep lies in fluid of specific gravity 0.9 such that its plane makes an angle of 45โฐ with water surface, upper edge 3m below free water surface. Determine the total pressure.

a.

86.5 N/cm²

b.

173 N/cm²

c.

43.25 N/cm²

d.

None of the mentioned

Discuss
Answer: (a).86.5 N/cm²
Q39.
A rectangular plan surface 5 m wide and 7 m deep lies in water in such a way that its plane makes an angle 60โฐ with the free surface of water. Determine the total pressure force when the upper edge is 3 m below the free surface.

a.

311.15 N/cm²

b.

622.3 N/cm²

c.

155.5 N/cm²

d.

None of the mentioned

Discuss
Answer: (a).311.15 N/cm²
Q40.
A circular plate 5.0 m diameter is immersed in such a way that its greatest and least depth below the free surface are 3 m and 1 m respectively. Determine the position of the centre of pressure.

a.

2.5 m

b.

5 m

c.

4.5 m

d.

6 m

Discuss
Answer: (a).2.5 m
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