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Hydraulics and Fluid Mechanics - Civil Engineering - section-1
  1. An ideal fluid is

    2. A.

     one which obeys Newton’s law of viscosity
    B.

     frictionless and incompressible
    C.

     very viscous
    D.

     frictionless and compressible

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  2. In which of the following the friction drag is generally larger than pressure drag?

    3. A.

     a circular disc or plate held normal to flow
    B.

     a sphere
    C.

     a cylinder
    D.

     an airfoil

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  3. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

    4. A.

     increase
    B.

     decrease
    C.

     remain same
    D.

     increase/decrease depending on depth of immersion

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  4. Fluid is a substance which offers no resistance to change of

    5. A.

     pressure
    B.

     flow
    C.

     shape
    D.

     volume

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  5. Choose the wrong statement.
    Alcohol is used in manometer, because

    6. A.

     its vapour pressure is low
    B.

     it provides suitable meniscus for the inclined tube
    C.

     its density is less
    D.

     it provides longer length for a given pressure difference

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  6. Alcohol is used in manometers because

    7. A.

     it has low vapour pressure
    B.

     it is clearly visible
    C.

     it has low surface tension
    D.

     it can provide longer column due to low density

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  7. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

    8. A.

     minimum
    B.

     maximum
    C.

     negative value
    D.

     could be any value

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  8. An open vessel of water is accelerated up an inclined plane. The free water surface will

    9. A.

     be horizontal
    B.

     make an angle in direction of inclination of inclined plane
    C.

     make an angle in opposite direction to inclination of inclined plane
    D.

     any one of above is possible

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  9. The unit of kinematic viscosity is

    10. A.

     gm/cm-sec²
    B.

     dyne-sec/cm²
    C.

     gm/cm²-sec
    D.

     cm²/sec

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  10. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

    11. A.

     g/3
    B.

     g/2
    C.

     2g/3
    D.

     g

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