   ## Hydraulics MCQ Practice Questions (Civil Engineering) Set 9

##### Equation of continuity of flow is based on the principle of conservation of:

Options are :

• Force
• None of these
• Mass
• Momentum

##### An open container filled with water is moved vertically upward with a uniform linear acceleration. The pressure at its bottom will be:

Options are :

• Greater than static pressure
• Lesser than static pressure
• Equal to static pressure
• None of these

Options are :

• A
• D
• C
• B

Options are :

• B
• C
• A
• D

##### For a most economical rectangular channel, the width of the channel must be:

Options are :

• Twice the depth of flow
• None of these
• Equal to depth of flow
• Half the depth of flow

Answer :Twice the depth of flow

##### 'Flow net' can be drawn only if the flow is:

Options are :

• Distortion
• None of these
• Turbulent
• Rotational

Options are :

• C
• D
• A
• B

##### Total energy line is:

Options are :

• All the above

##### Pick up the correct statement from the following:

Options are :

• Discharge over a triangular notch is proportional to H^(5/2)
• None of these
• Discharge over a rectangular notch is proportional to H^(3/2)

Answer :Discharge over a triangular notch is proportional to H^(5/2) Discharge over a rectangular notch is proportional to H^(3/2)

##### Pick up the incorrect statement from to following regarding triangular notch:

Options are :

• For measuring low discharge, it gives more accurate result
• Ventilation is necessary
• None of these
• Only one reading (i.e. H) is required for computation of discharge

Options are :

• B
• D
• A
• C

##### In an inclined position, a venturimeter records:

Options are :

• None of these

Options are :

• D
• B
• A
• C

##### A stepped notch is a combination of:

Options are :

• Rectangular notches of different sizes
• All the above
• Rectangular and triangular notches
• Triangular notches of different sizes

Answer :Rectangular notches of different sizes

##### In an inclined pipe, the pressure difference at its two ends is due to:

Options are :

• Sudden head drop at inlet
• All the above

##### The flow in open channel is said to be subcritical if the Froude number is:

Options are :

• Greater than 1.0
• Equal to 1.0
• Less than 1.0
• None

##### When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure:

Options are :

• Decreases as the square of the radial distance
• Varies inversely as the altitude along any vertical line
• Increases linearly to its radial distance
• Varies as the square of the radial distance
• None of these

Options are :

• 30░
• 90░
• 60░
• 120░

##### Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is:

Options are :

• None of these
• Equal to external mouth piece
• Less in the internal mouth piece
• More in the internal mouth piece

Answer :More in the internal mouth piece

##### In a two dimensional flow if the components of the velocity are u = ax ; v = by, the point where no motion occurs, is known as:

Options are :

• Stationary point
• None of these
• Critical point
• Neutral point
• Stagnation point

Options are :

• A
• C
• B
• D

##### For critical flow, the Froude number is:

Options are :

• 1.0
• 2
• More than 1.0
• Less than 1.0

Options are :

• C
• A
• B
• D

##### In C.G.S. system the unit of visocity is:

Options are :

• Newton
• Dyne
• Joule
• None of these
• Poise

##### The flow in open channel is laminar if the Reynold number is:

Options are :

• None of these
• Less than 500
• 1000
• More than 500

##### Centre of buoyancy is:

Options are :

• None of these
• Centroid of the floating body
• Centroid of the fluid displaced
• Centre of pressure of the displaced liquid

Answer :Centroid of the fluid displaced

Options are :

• D
• A
• C
• B

##### An orifice is called a large orifice if water head, is:

Options are :

• Twice the diameter of the orifice
• Five times the diameter of the orifice
• Four times the diameter of the orifice
• Thrice the diameter of the orifice

Answer :Five times the diameter of the orifice

##### A floating body attains stable equilibrium if its metacentre is:

Options are :

• Anywhere
• At the centroid
• Above the centroid
• Below the centroid

Options are :

• B
• C
• D
• A