   ## Hydraulics MCQ Practice Questions (Civil Engineering) Set 10

Options are :

• B
• C
• D
• E
• A

Options are :

• 3/4
• 1/2
• 3/2
• 2/3

Options are :

• 15 m/sec
• 10 m/sec
• 6 m/sec
• 8 m/sec
• 12 m/sec

##### In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to:

Options are :

• One-fourth the diameter of the orifice
• Two-third the diameter of the orifice
• One-third the diameter of the orifice
• Diameter of the orifice

Answer :One-fourth the diameter of the orifice

##### In steady flow, which one of the following changes with time:

Options are :

• None of these
• Pressure
• Velocity
• Density

##### The width of a weir with end contraction, is:

Options are :

• Equal to the width of the channel
• Less than the width of the channel
• None of these
• Half the width of the channel

Answer :Less than the width of the channel

Options are :

• 66.6%
• 77.7%
• 88.8%
• 55.5%

##### The unit of the viscosity is:

Options are :

• Newton-sec^(2)/m^(3)
• m^(2) per sec
• Newton sec per m^(2)
• kg sec/m^(2)

##### The centre of pressure of a vertical plane immersed in a liquid is at:

Options are :

• None of these
• Centre of lower edge
• Centre of higher edge
• Centroid of the area

##### Weber number is the ratio of inertia force to:

Options are :

• Surface tension
• Gravitational force
• Elasticity
• Viscosity

##### The gases are considered incompressible if Match number is:

Options are :

• Equal to 1.5
• Equal to 1.0
• Less than 0.2
• Is more than 0.5

##### The dimensionless parameter not applicable to flowing liquids, is:

Options are :

• Kinematic viscosity
• Friction factor
• Reynold number
• Pressure coefficient
• Weber number

##### Most economical section of a circular channel for maximum velocity, is if:

Options are :

• Wetted perimeter = 2.245 diameters
• Hydraulic mean depth = 0.304 diameter
• Depth of water = 0.810 diameter
• All the above

##### The hydrostatic force acts through:

Options are :

• Centre of pressure
• Centre of bottom edge
• Centre of top edge
• Metacentre

##### The flow in a channel is said to be non-uniform, if:

Options are :

• Head needed to overcome frictional reistance is less than the drop in elevation of channel bed
• All the above
• Head needed to overcome frictional resistance is more than the drop in elevation of channel bed
• Free water surface of an open channel is not parallel to the bed of channel

##### The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to:

Options are :

• None of these
• Specific weight of water
• Bulk modulus of elasticity of water
• Square root of the bulk modulus of elasticity of water

Answer :Square root of the bulk modulus of elasticity of water

Options are :

• 1.1
• 0.8
• 1.0
• 0.9

##### The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other, is called:

Options are :

• Uniform flow
• Turbulent flow
• Stream line flow

##### The pressure rise due to water hammer depends upon:

Options are :

• The elasticity of the pipe material
• The velocity of flow of water in the pipe
• Time taken to close the valve
• The length of pipe
• All of above