Quiz  /  Fluid Mechanics Gate & PSU MCQ Questions With Answers

  • 1. 
    The pressure less than atmospheric pressure is known as

  • suction pressure
  • vacuum pressure
  • negative gauge pressure
  • all of these

  • 2. 
    The value of the compressibility of an ideal fluid is

  • zero
  • unity
  • infinity
  • more than that of a real fluid

  • 3. 
    The value of the viscosity of an ideal fluid is

  • zero
  • unity
  • infinity
  • more than that of a real fluid

  • 4. 
    The value of the Bulk Modulus of elasticity for an incompressible fluid is

  • zero
  • unity
  • infinity
  • very low

  • 5. 
    Which one of the following is the unit of specific weight?

  • N/m3
  • N/m2
  • N/m
  • N/ms

  • 6. 
    Which of the following quantities has the dimensions [M0 L0 T 0]

  • Density
  • Stress
  • Strain
  • Strain Rate

  • 7. 
    In which type of matter, one won’t find a free surface?

  • Solid
  • Liquid
  • Gas
  • Fluid

  • 8. 
    The discharge through a channel of trapezoidal section is maximum when

  • width of channel at the top is equal to twice the width at the bottom
  • depth of channel is equal to the width at the bottom
  • the sloping side is equal to half the width at the top
  • the sloping side is equal to the width at the bottom

  • 9. 
    The kinematic viscosity is the

  • ratio of absolute viscosity to the density of the liquid
  • ratio of density of the liquid to the absolute viscosity
  • product of absolute viscosity and density of the liquid
  • product of absolute viscosity and mass of the liquid

  • 10. 
    If a person studies about a fluid which is at rest, what will you call his domain of study?

  • Fluid Mechanics
  • Fluid Statics
  • Fluid Kinematics
  • Fluid Dynamics

  • 11. 
    The time period(t) of a pendulum depends upon the length (L) of the pendulum and acceleration due to gravity(g). Derive the expression for Time period.

  • t =2π√L/2g
  • t =2π√L/g
  • t =π√L/2g
  • t =π√L/g

  • 12. 
    One litre of water occupies a volume of

  • 100 cm3
  • 250 cm3
  • 500 cm3
  • 1000 cm3

  • 13. 
    Which one of the following is the dimension of Weight density/Specific Weight ?

  • M L-1T-1
  • M L-2 T-2
  • M L-3 T-2
  • M L-3 T-3

  • 14. 
    The similarity of motion between the model and prototype is ________

  • Dynamic similarity
  • Potential similarity
  • Kinematic similarity
  • Design similarity

  • 15. 
    The total energy line lies over the hydraulic gradient line by an amount equal to the

  • pressure head
  • velocity head
  • pressure head + velocity head
  • pressure head - velocity head

  • 16. 
    Calculate the Capillary rise in a glass tube of 2.5 mm diameter when immersed vertically in mercury. Take surface tension, σ =0.52 N/m for mercury in contact with air. The density of mercury is given as 13,600 kg/m3 and angle of contact =130°

  • -0.2 cm
  • -0.4 cm
  • 0.5 cm
  • -0.5 cm

  • 17. 
    A venturiflume is used to measure

  • pressure of liquid
  • discharge of liquid
  • pressure difference between two points in a channel
  • pressure difference between two points in a pipe

  • 18. 
    The fluid will rise in capillary when the capillary is placed in fluid, if

  • the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules
  • the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules
  • the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules
  • None of the above
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