Hydraulics And Fluid Mechanics Set 7

On This Page

This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 7

Q1 | A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.
  • H/3
  • H/2
  • 2H/3
  • 3H/4
Q2 | An ideal flow of any fluid must fulfill the following
  • Newton's law of motion
  • Newton's law of viscosity
  • Pascal' law
  • Continuity equation
Q3 | The flow in a pipe or channel is said to be uniform when
  • The liquid particles at all sections have the same velocities
  • The liquid particles at different sections have different velocities
  • The quantity of liquid flowing per second is constant
  • Each liquid particle has a definite path
Q4 | Surface tension
  • Acts in the plane of the interface normal to any line in the surface
  • Is also known as capillarity
  • Is a function of the curvature of the interface
  • Decreases with fall in temperature
Q5 | Select the wrong statement
  • An equivalent pipe is treated as an ordinary pipe for all calculations
  • The length of an equivalent pipe is equal to that of a compound pipe
  • The discharge through an equivalent pipe is equal to that of a compound pipe
  • The diameter of an equivalent pipe is equal to that of a compound pipe
Q6 | manometers because Alcohol is used in
  • It has low vapour pressure
  • It is clearly visible
  • It has low surface tension
  • It can provide longer column due to low density
Q7 | If no resistance is encountered by displacement, such a substance is known as
  • Fluid
  • Water
  • Gas
  • Ideal fluid
Q8 | 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
Q9 | The viscosity of water is __________ than that of mercury.
  • Higher
  • Lower
  • Same as
  • None of these
Q10 | Surface energy per unit area of a surface is numerically equal to
  • Atmospheric pressure
  • Surface tension
  • Force of adhesion
  • Force of cohesion
Q11 | The specific weight of sea water is __________ that of pure water.
  • Same as
  • Less than
  • More than
  • None of these
Q12 | Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?
  • Venturimeter
  • Orifice plate
  • Nozzle
  • All of the above
Q13 | The depth of the centre of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is
  • 2.4 m
  • 3.0 m
  • 4.0 m
  • 5.0 m
Q14 | An internal mouthpiece is said to be running free if the length of the mouthpiece is __________the diameter of the orifice.
  • Less than twice
  • More than twice
  • Less than three times
  • More than three times
Q15 | An ideal flow of any fluid must satisfy
  • Pascal law
  • Newton's law of viscosity
  • Boundary layer theory
  • Continuity equation
Q16 | The height of a water column equivalent to a pressure of 0.15 MPa is
  • 15.3 m
  • 25.3 m
  • 35.3 m
  • 45.3 m
Q17 | The region between the separation streamline and the boundary surface of the solid body isknown as
  • Wake
  • Drag
  • Lift
  • Boundary layer
Q18 | Froude number is significant in
  • Supersonics, as with projectile and jet propulsion
  • Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
  • Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
  • All of the above
Q19 | The ratio of specific weight of a liquid to the specific weight of pure water at a standardtemperature is called
  • Density of liquid
  • Specific gravity of liquid
  • Compressibility of liquid
  • Surface tension of liquid
Q20 | A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to
  • 10 kg
  • 100 kg
  • 1000 kg
  • 1 kg
Q21 | The total head of a liquid particle in motion is equal to
  • Pressure head + kinetic head + potential head
  • Pressure head - (kinetic head + potential head)
  • Potential head - (pressure head + kinetic head)
  • Kinetic head - (pressure head + potential head)
Q22 | Free surface of a liquid tends to contract to the smallest possible area due to force of
  • Surface tension
  • Viscosity
  • Friction
  • Cohesion
Q23 | The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select thecorrect statement.
  • The bodies A and B have equal stability
  • The body A is more stable than body B
  • The body B is more stable than body A
  • The bodies A and B are unstable
Q24 | The rise or depression of liquid in a tube due to surface tension will increase in size of tube will
  • Increase
  • Remain unaffected
  • May increase or decrease depending on the characteristics of liquid
  • Decrease
Q25 | The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
  • wA
  • wx
  • wAx
  • wA/x