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Civil Engineering :: Hydraulics and Fluid Mechanics - Civil Engineering

  1. The Prartdtl mixing length is

  2. A.

     zero at the pipe wall

    B.

     maximum at the pipe wall

    C.

     independent of shear stress

    D.

     none of the above


  3. The discharge through a V- notch varies as

  4. A.

     H1/2

    B.

     H3’2

    C.

     H5/2

    D.

     H5’4 where H is head.


  5. The units of viscosity are

  6. A.

     metre2/sec

    B.

     kg sec/metre

    C.

     newton-sec/metre2

    D.

     newton-sec/metre


  7. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

  8. A.

     less than 1

    B.

     between 1 and 100

    C.

     160

    D.

     200


  9. When a body floating in a liquid, is displaced slightly, it oscillates about

  10. A.

     e.g. of body

    B.

     center of pressure

    C.

     center of buoyancy

    D.

     metacentre


  11. The normal stress is same in all directions at a point in a fluid

  12. A.

     only when the fluid is frictionless

    B.

     only when the fluid is incompressible and has zero viscosity

    C.

     when there is no motion of one fluid layer relative to an adjacent layer

    D.

     irrespective of the motion of one fluid layer relative to an adjacent layer


  13. The surface tension of mercury at normal temperature compared to that of water is

  14. A.

     more

    B.

     less

    C.

     same

    D.

     more or less depending on size of glass tube


  15. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

  16. A.

     the area is horizontal

    B.

     the area is vertical

    C.

     the area is inclined

    D.

     all of the above


  17. Operation of McLeod gauge used for low pressure measurement is based on the principle of

  18. A.

     gas law

    B.

     Boyle’s law

    C.

     Charle’s law

    D.

     Pascal’s law


  19. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

  20. A.

     1 Pa

    B.

     91 Pa

    C.

     981 Pa

    D.

     9810 Pa