Fluid Mechanics MCQs with answers Page - 8

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Q. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

  • (A) the weight of the body
  • (B) more than the weight of the body
  • (C) less than the weight of the body
  • (D) weight of the fluid displaced by the body

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Q. The difference of pressure between the inside and outside of a liquid drop is

  • (A) p=T×r
  • (B) p=T/r
  • (C) p=T/2r
  • (D) p=2T/r

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Q. Fluid is a substance that

  • (A) cannot be subjected to shear forces
  • (B) always expands until it fills any container
  • (C) has the same shear stress.at a point regardless of its motion
  • (D) cannot remain at rest under action of any shear force

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Q. The line of action of the buoyant force acts through the

  • (A) centroid of the volume of fluid vertically above the body
  • (B) center of the volume of floating body
  • (C) center of gravity of any submerged body
  • (D) centriod of the displaced volume of fluid

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Q. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

  • (A) 3.75 m
  • (B) 4.0 m
  • (C) 4.2m
  • (D) 4.5m

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Q. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is

  • (A) 10 m/sec2
  • (B) 9.81 m/sec2
  • (C) 10.2 m/sec2
  • (D) 9.75 m/sec2

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Q. The region between the separation streamline and the boundary surface of the solid body is known as

  • (A) wake
  • (B) drag
  • (C) lift
  • (D) boundary layer

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Q. Steady flow occurs when

  • (A) the direction and magnitude of the velocity at all points are identical
  • (B) the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
  • (C) the magnitude and direction of the velocity do not change from point to point in the fluid
  • (D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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Q. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

  • (A) constant over the cross section
  • (B) parabolic distribution across the section
  • (C) zero at the mid plane and varies linearly with distance from mid plane
  • (D) zero at plates and increases linearly to midpoint

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Q. The horizontal component of buoyant force is

  • (A) negligible
  • (B) same as buoyant force
  • (C) zero
  • (D) none of the above

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