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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