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Civil Engineering :: Hydraulics and Fluid Mechanics - Civil Engineering

  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


  3. Mercury is often used in barometer because

  4. 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)


  5. For a floating body to be in equilibrium

  6. 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


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

  8. A.

     center of gravity

    B.

     center of pressure

    C.

     metacentre

    D.

     center of buoyancy


  9. Buoyant force is

  10. 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


  11. Coefficient of contraction for an external cylindrical mouthpiece is

  12. A.

     1.00

    B.

     0.855

    C.

     0.7H

    D.

     0.611


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

  14. A.

     atmospheric pressure

    B.

     surface tension

    C.

     force of adhesion

    D.

     force of cohesion


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

  16. A.

     dissolved air

    B.

     dissolved salt

    C.

     suspended matter

    D.

     all of the above


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

  18. A.

     1/2

    B.

     2/3

    C.

     3/2

    D.

     2


  19. 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

  20. A.

     400 kg/cm²

    B.

     4000 kg/cm²

    C.

     40 x 105 kg/cm²

    D.

     40 x 106 kg/cm²