Buoyancy and Floatation MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Buoyancy and Floatation, 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 Buoyancy and Floatation 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 Buoyancy and Floatation mcq questions that explore various aspects of Buoyancy and Floatation problems. Each MCQ is crafted to challenge your understanding of Buoyancy and Floatation 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 Buoyancy and Floatation 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 Buoyancy and Floatation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Buoyancy and Floatation MCQs | Page 4 of 4

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Q31.
A wooden cylinder of sp.gr. = 0.6 and circular in cross-section is required to float in oil(sp.gr. = 0.90). Find the L/D ratio for the cylinder to float with its longitudinal axis vertical in oil, where L is the height of cylinder and D is its diameter.

a.

L/D<9/16

b.

L/D<3/4

c.

L/D<2/3

d.

None of the mentioned

Discuss
Answer: (b).L/D<3/4
Q32.
A cylinder(uniform density distribution) of radius 3.0 m has a height of 9.0 m. The specific gravity of the material of cylinder 0.85 and it is floating in water with its axis vertical. State whether the equilibrium is stable or unstable.

a.

Stable

b.

Unstable

c.

Insufficient Data

d.

None of the mentioned

Discuss
Answer: (a).Stable
Q33.
If the magnitude of dimension of a rectangular wooden block is length>breadth>height, then for it to float on the water, it should be immersed in what manner?

a.

It should be immersed vertically such that length is partially immersed

b.

It should be immersed horizontally such that breadth is partially immersed

c.

It should be immersed such that height is partially immersed

d.

None of the mentioned

Discuss
Answer: (b).It should be immersed horizontally such that breadth is partially immersed
Q34.
When body is completely or partially immersed in a fluid, how much its weight be distributed for it to be in stable equilibrium.

a.

Around the lower part

b.

Around the upper part

c.

Is independent of weight distribution

d.

None of the mentioned

Discuss
Answer: (a).Around the lower part
Q35.
In unstable equilibrium what is the relation between forces?

a.

Buoyancy force= Weight of body

b.

Buoyancy force > Weight of body

c.

Buoyancy force < Weight of body

d.

None of the mentioned

Discuss
Answer: (a).Buoyancy force= Weight of body
Q36.
The floating body is said to be in unstable equilibrium if the metacentre is below the centre of gravity.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q37.
The floating body is said to be in neutral equilibrium if the metacentre is above the centre of gravity.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q38.
In stable equilibrium for completely submerged bodies what is the relation between forces?

a.

Buoyancy force= Weight of body,the centre of buoyancy is below the centre of gravity.

b.

Buoyancy force=Weight of body, the centre of buoyancy is above the centre of gravity.

c.

Buoyancy force < Weight of body

d.

None of the mentioned

Discuss
Answer: (b).Buoyancy force=Weight of body, the centre of buoyancy is above the centre of gravity.
Q39.
The below figure shows an inclined U-tube mercury manometer. The vertical end of the tube is exposed to a gas of gauge pressure 50 kPa and the inclined end is exposed to the atmosphere. The inclined part of the tube is at an angle of 30° with the horizontal. Find the value of h (in cm) (take g = 9.8 m/s², ρmercury = 13600 kg/m³)

a.

60

b.

50

c.

75

d.

25

Discuss
Answer: (c).75
Q40.
In the manometer given above, 2 immiscible fluids mercury (ρ = 13600 kg/m³) and water (ρ = 1000 kg/m³) are used as manometric fluids. The water end is exposed to atmosphere (100 kPa) and the mercury end is exposed to a gas. At this position, the interface between the fluids is at the bottom most point of the manometer. Ignore the width of the manometer tube and the radius of curvature. The value of h is found to be 9.45 m. The height of the mercury column is given to be 75 cm. Find the gauge pressure of the gas. (g = 9.8 m/s²)

a.

100 kPa

b.

50 kPa

c.

200 kPa

d.

0 kPa

Discuss
Answer: (d).0 kPa
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