Hydraulics And Fluid Mechanics Set 8

Civil Engineering

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 8

Q1 | The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
  • Less than
  • More than
  • Equal to
  • None of these
Answer: More than
Q2 | The line of action of the buoyant force acts through the Centroid of the
  • Submerged body
  • Volume of the floating body
  • Volume of the fluid vertically above the body
  • Displaced volume of the fluid
Answer: Displaced volume of the fluid
Q3 | The intensity of pressure at any point, in a liquid, is
  • Directly proportional to the area of the vessel containing liquid
  • Directly proportional to the depth of liquid from the surface
  • Directly proportional to the length of the vessel containing liquid
  • Inversely proportional to the depth of liquid from the surface
Answer: Directly proportional to the depth of liquid from the surface
Q4 | During the opening of a valve in a pipe line, the flow is
  • Steady
  • Unsteady
  • Uniform
  • Laminar
Answer: Unsteady
Q5 | A manometer is used to measure
  • Atmospheric pressure
  • Pressure in pipes and channels
  • Pressure in Venturimeter
  • Difference of pressures between two points in a pipe
Answer: Pressure in pipes and channels
Q6 | For hypersonic flow, the Mach number is
  • Unity
  • Greater than unity
  • Greater than 2
  • Greater than 4
Answer: Greater than 4
Q7 | The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
  • 2gH
  • H × g)
  • 2g × H
  • 2gh)
Answer: 2gh)
Q8 | For pipes, laminar flow occurs when Reynolds number is
  • Less than 2000
  • Between 2000 and 4000
  • More than 4000
  • Less than 4000
Answer: Less than 2000
Q9 | When the flow in an open channel is gradually varied, the flow is said to be
  • Steady uniform flow
  • Steady non-uniform flow
  • Unsteady uniform flow
  • Unsteady non-uniform flow
Answer: Steady non-uniform flow
Q10 | In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, thenthe mouthpiece is said to be
  • Running full
  • Running free
  • Partially running full
  • Partially running free
Answer: Running free
Q11 | The units of kinematic viscosity are
  • Metres² per sec
  • kg sec/metre
  • Newton-sec per metre
  • Newton-sec per metre
Answer: Metres² per sec
Q12 | The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
  • Expands
  • Does not change
  • Contracts
  • None of these
Answer: Contracts
Q13 | Newton's law of viscosity is a relationship between
  • Shear stress and the rate of angular distortion
  • Shear stress and viscosity
  • Shear stress, velocity and viscosity
  • Pressure, velocity and viscosity
Answer: Shear stress and the rate of angular distortion
Q14 | 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
Answer: Velocity head
Q15 | Choose the wrong statement
  • The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface
  • The horizontal component acts through the center of pressure for the vertical projection
  • The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
  • The vertical component passes through the center of pressure of the volume
Answer: The vertical component passes through the center of pressure of the volume
Q16 | In open channels, the specific energy is the
  • Total energy per unit discharge
  • Total energy measured with respect to the datum passing through the bottom of the channel
  • Total energy measured above the horizontal datum
  • Kinetic energy plotted above the free surface of water
Answer: Total energy measured with respect to the datum passing through the bottom of the channel
Q17 | For a floating body to be in stable equilibrium, its metacentre should be
  • Below the center of gravity
  • Below the center of buoyancy
  • Above the center of buoyancy
  • Above the center of gravity
Answer: Above the center of gravity
Q18 | A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
  • 2.89 kN
  • 8.29 kN
  • 9.28 kN
  • 28.9 kN
Answer: 8.29 kN
Q19 | Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surfacewill be
  • 1000 kg
  • 4000 kg
  • 2000 kg
  • 8000 kg
Answer: 1000 kg
Q20 | If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.
  • Neutral
  • Stable
  • Unstable
  • None of these
Answer: Neutral
Q21 | A streamline is defined as the line
  • Parallel to central axis flow
  • Parallel to outer surface of pipe
  • Of equal velocity in a flow
  • Along which the pressure drop is uniform
Answer: Of equal velocity in a flow
Q22 | The flow in a pipe or channel is said to be non-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
Answer: The liquid particles at different sections have different velocities
Q23 | Hydrometer is used to determine
  • Specific gravity of liquids
  • Specific gravity of solids
  • Specific gravity of gases
  • Relative humidity
Answer: Specific gravity of liquids
Q24 | The dynamic viscosity of the liquid __________ with rise in temperature.
  • Remain unaffected
  • Increases
  • Decreases
  • None of these
Answer: Decreases
Q25 | For pipes, turbulent flow occurs when Reynolds number is
  • Less than 2000
  • Between 2000 and 4000
  • More than 4000
  • Less than 4000
Answer: More than 4000
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