Fluid Mechanics – Buoyancy & Floatation MCQ – Set 3 (15 MCQs)

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Fluid Mechanics – Buoyancy & Floatation MCQ – Set 3 (15 MCQs)

Our valuable visitors, TheFluidMechanic provides Fluid Mechanics MCQ (multiple choice questions) and their model answers. The following multiple choice Fluid Mechanics questions are very essential for quizzes, campus tests, semester midterm and final exams, engineering job interviews (civil engineering, mechanical engineering and chemical engineering) and competitive exams like The Principles and Practice of Engineering (PE) exam, The Fundamentals of Engineering (FE) exam and GATE. These multiple choice questions are developed for engineering students and professionals of different disciplines, these model questions are asked frequently in online technical tests and across interviews of engineering consultants and firms.

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Question No.1

The center of buoyancy of a submerged body :

  • coincides with the center of gravity of the body
  • coincides with the centroid of the displaced volume of the fluid
  • is always below the center of gravity of the body
  • is always above the centroid of the displaced volume of liquid

Question No.2

An object weighing 100 N in air was found to weigh 75 N when fully submerged in water. The relative density of the object is :

  • 4.0
  • 4.5
  • 2.5
  • 1.25

Question No.3

An iceberg has 12 {d8436e6188dc3d199bf8c3981ea7a790e12a890a66b7d0a0d43491ce624dcb00} of its volume projecting above the surface of the sea. If the density of sea water is 1025 kg/m3, the density of the iceberg is :

  • 878 kg/m3
  • 1000 kg/m3
  • 1148 kg/m3
  • 902 kg/m3

Question No.4

An object weighs 50 N in water and 80 N in an oil of relative density 0.80. Its volume in liters is :

  • 15.3
  • 60.0
  • 30.6
  • 50.0

Question No.5

A floating body displaces :

  • a volume of liquid equal in magnitude to its own volume
  • a volume of liquid equal to its own submerged weight
  • a weight of liquid equal in magnitude to its own weight
  • a weight of liquid which depends upon the volume of the container

Question No.6

A metal block is thrown into a deep lake. As it sinks deeper in water, the buoyant force acting in it :

  • increases
  • remains the same
  • decreases
  • first increases and then decreases

Question No.7

When a block of ice floating on water in a container melts, the level of water in the container :

  • rises
  • first falls and then rises
  • remains the same
  • falls

Question No.8

When a ship enters sea from a river one can expect it :

  • to rise a little
  • to sink a little
  • to remain at the same level of draft
  • to rise or fall depending on whether it is of wood or steel

Question No.9

Buoyant force is the :

  • lateral force acting on a submerged body
  • resultant force acting on a submerged body
  • resultant hydrostatic force on a body due to fluid surrounding it
  • the resultant force due to water on a body

Question No.10

A right circular wooden cone (specific gravity = 0.80) with a base diameter of 0.6 m and height of 0.8 m floats in water such that its axis is vertical and apex is downward. The immersed depth of cone is :

  • 0.480 m
  • 0.533 m
  • 0.600 m
  • 0.743 m

Question No.11

A 12 cm steel cube (relative density = 7.6) is submerged in a two layered fluid system. The bottom layer is mercury (relative density = 13.6) and the top layer is kerosene (relative density = 0.80). The height of the top surface of the cube above the interface of the two liquids is :

  • 5.63 cm
  • 2.95 cm
  • 6.0 cm
  • zero

Question No.12

Two cubes of size 1.0 m sides, one of relative density = 0.60 and another of relative density = 1.15, are connected by a weightless wire and placed in a large tank of water. Under equilibrium, the lighter cube will project above the water surface to a height of :

  • 10 cm
  • zero
  • 50 cm
  • 25 cm

Question No.13

*49- If B = center of buoyancy, G = is the center of gravity and M = metacenter, of a floating body, the body will be in stable equilibrium if :

  • MG = 0
  • M is below G
  • BG = 0
  • M is above G

Question No.14

In a floating body, I = moment of inertia of water line area about the longitudinal axis, V = volume of displaced fluid, B = center of buoyancy, G = center of gravity and M = metacenter. For stable equilibrium of this body :

  • \[BG = \frac{I}{V} + MG\]
  • \[MG = \frac{I}{V} + BG\]
  • \[MG = \frac{I}{V}/MG\]
  • \[BG + MG = \frac{I}{V}\]

Question No.15

*51- A body is floating in a liquid as shown in the following figure. The center of buoyancy, center of gravity and metacenter are labeled as B, G and M respectively. The body is :

Fluid Mechanics MCQ - Q.51

  • vertically stable
  • vertically unstable
  • rotationally stable
  • rotationally unstable

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