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  • Question
  • When a body is placed over a liquid, it will float if


  • Options
  • A. gravitational force is equal to the upthrust of the liquid
  • B. gravitational force is less than the upthrust of the liquid
  • C. gravitational force is more than the upthrust of the liquid
  • D. none of the above

  • Correct Answer
  • gravitational force is equal to the upthrust of the liquid 


  • Hydraulics and Fluid Mechanics problems


    Search Results


    • 1. When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

    • Options
    • A. gauge pressure
    • B. absolute pressure
    • C. positive gauge pressure
    • D. vacuum pressure
    • Discuss
    • 2. The viscosity of a liquid __________ its rate of flow through a hole in a vessel.

    • Options
    • A. effects
    • B. does not effect
    • Discuss
    • 3. The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

    • Options
    • A. pressure head
    • B. velocity head
    • C. pressure head + velocity head
    • D. pressure head - velocity head
    • Discuss
    • 4. The liquid used in manometers should have

    • Options
    • A. low density
    • B. high density
    • C. low surface tension
    • D. high surface tension
    • Discuss
    • 5. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

    • Options
    • A. continuity equation
    • B. Bernoulli's equation
    • C. Pascal's law
    • D. Archimede's principle
    • Discuss
    • 6. The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir

    • Options
    • A. Agree
    • B. Disagree
    • Discuss
    • 7. The tangential velocity of the water element having a free vortex is

    • Options
    • A. directly proportional to its distance from the centre
    • B. inversely proportional to its distance from the centre
    • C. directly proportional to its (distance)2 from the centre
    • D. inversely proportional to its (distance)2 from the centre
    • Discuss
    • 8. The hydraulic mean depth for a circular pipe of diameter (d) is

    • Options
    • A. d/6
    • B. d/4
    • C. d/2
    • D. d
    • Discuss
    • 9. When the Mach number is less than unity, the flow is called

    • Options
    • A. sub-sonic flow
    • B. sonic flow
    • C. super-sonic flow
    • D. hyper-sonic flow
    • Discuss
    • 10. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

    • Options
    • A. 3.53 kN
    • B. 33.3 kN
    • C. 35.3 kN
    • D. none of these
    • Discuss


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