### Hydraulics And Fluid Mechanics Set 7

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 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
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