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Hydraulics and Fluid Mechanics - Civil Engineering - section-1
  1. Newton’s law of viscosity is a relationship between

    2. A.

     shear stress anctthejiate of angular distortion
    B.

     shear stress and viscosity
    C.

     shear stress, velocity and viscosity
    D.

     pressure, velocity and viscosity

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  2. Mercury is often used in barometer because

    3. A.

     it is the best liquid
    B.

     the height of barometer will be less
    C.

     its vapour pressure is so low that it may be neglected
    D.

     both (B) and (C)

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  3. For a floating body to be in equilibrium

    4. A.

     meta center should be above e.g.
    B.

     center of buoyancy and e.g. must lie on same vertical plane
    C.

     a righting couple should be formed
    D.

     all of the above

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  4. Resultant pressure of the liquid in the case of an immersed body acts through

    5. A.

     center of gravity
    B.

     center of pressure
    C.

     metacentre
    D.

     center of buoyancy

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  5. Buoyant force is

    6. A.

     resultant force acting on a floating body
    B.

     equal to the volume of liquid displaced
    C.

     force necessary to keep a body in equilibrium
    D.

     the resultant force on a body due to the fluid surrounding it

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  6. Coefficient of contraction for an external cylindrical mouthpiece is

    7. A.

     1.00
    B.

     0.855
    C.

     0.7H
    D.

     0.611

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  7. Surface energy per unit area of a surface is numerically equal to

    8. A.

     atmospheric pressure
    B.

     surface tension
    C.

     force of adhesion
    D.

     force of cohesion

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  8. Specific weight of sea water is more that of pure water because it contains

    9. A.

     dissolved air
    B.

     dissolved salt
    C.

     suspended matter
    D.

     all of the above

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  9. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is

    10. A.

     1/2
    B.

     2/3
    C.

     3/2
    D.

     2

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  10. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

    11. A.

     400 kg/cm²
    B.

     4000 kg/cm²
    C.

     40 x 105 kg/cm²
    D.

     40 x 106 kg/cm²

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