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Fluid Mechanics MCQ Book solution Quiz 01

Pascal Second is a unit of

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SI unit of Dynamic viscosity is Pascal Second or Ns/m2 or Poise SI unit of Kinematic viscosity is Stokes or m2/sec 1 stoke = 10^(-4) m2/s 1 poise = 0.1 pa.s

An ideal fluid is

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Ideal fluid is incompressible and have no viscosity. Onlu imaginary Fluid

The unit of Kinematics viscosity is

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1 stoke = 0.01 cm2/sec = 0.0001 m2/sec

If the dynamic viscosity of a fluid is 0.5 and specific gravity is 0.5, then the Kinetic viscosity of the fluid in stoke is

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Kinematic viscosity = DynamicViscosity/SpecificGravity = 0.5/0.5 =1

The viscosity of a gas

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Viscosity for gas increases with increase in temperature. Viscosity for liquid increases with decrease in temperature.

Newton's law of viscosity relates

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T=u.du/dy

The rise of liquid of specific weight γ in a capillary tube of radius r is given by, where σ is the surface tension of the liquid

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The intensity of pressure developed by surface tension of 0.075 N/m in a droplet of water of 0.075 mm diameter is

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ΔP = 2σ/d for jet ΔP = 8σ/d for soap bubble ΔP = 4σ/d for droplet = 4 x 0.075/0.075 x 10^-3 = .004 N/mm2 = 0.4 N/cm2

Surface tension of water

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1 kilo Pascal is equal to

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1 Pascal = 1 N/m2 Kilo = 10^3 1 kilo Pascal = 1000 N/m2

Abe liquid has greater Cohesion than adhesion with the solid, then the liquid in the capillary tube will

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Capillary fall if Cohesion is greater than adhesion. Rise if Adhesion>cohesion

Examine the following for statements 1. Surface tension is due to Cohesion only 2. Capillarity is due to adhesion only 3. Surface tension is due to both Cohesion and adhesion 4. Capillarity is due to both Cohesion and adhesion Of the following statements are true

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Pressure of 200 kPa is equivalent to a head of X metres of carbon tetrachloride of relative density 1.59 where x is equal to

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Density = 1.59*water density = 1590 kg/m3 P = pgh 200x10^3 = 1590*9.81*h h = 12.82 m

Fo a vertical semicircular plate, submerged in a homogeneous liquid with its diameter d at the free surface, the depth of centre of pressure from the free surface is

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