   ## Hydraulics MCQ Practice Questions (Civil Engineering) Set 6

Options are :

• C
• D
• A
• E
• B

##### For maximum horse power of a nozzle, the head supplied must be equal to:

Options are :

• Twice the head loss in the pipe due to friction
• Four times the head loss in the pipe due to friction
• Head loss in the pipe due to friction
• Thrice the head loss in the pipe due to friction

##### An ideal fluid is:

Options are :

• Compressible and non-viscous
• Compressible
• Incompressible
• Slightly affected by surface torque

Options are :

• 3/4
• 2/3
• 1/2
• 3/2
• 4/3

##### Molecules of fluids get attracted due to:

Options are :

• Cohesion
• None of these
• Capillarity action
• Surface tension

##### A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is ?5 cm, the angular velocity of rotation, is:

Options are :

• None of these

Options are :

• 5.0 m
• 2.4 m
• 6.4 m
• 10.0 m

##### A fluid particle may possess the displacement of:

Options are :

• All the above
• Translation
• Rotation
• Distortion

##### If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be:

Options are :

• Non-uniform flow
• Uniform flow
• Laminar
• Turbulent flow

##### Discharge over an ogee weir remains the same as that of:

Options are :

• Cippoletti weir
• Drowned weir
• Sharp crested weir
• Triangular weir

##### Back water curve is caused if:

Options are :

• None of these
• Friction head loss is more than the bed slope
• Pressure is due to weir in the channel
• There is an increase in width of the channel

Answer :Pressure is due to weir in the channel

##### Manometers are used to measure:

Options are :

• Very low pressure
• Difference in pressure at two points
• Pressure in water channels, pipes etc
• Atmospheric pressure

Answer :Pressure in water channels, pipes etc

##### In an open tube, free surface of mercury remains:

Options are :

• Curved downwards
• Curved upwards
• Horizontal
• None of these

##### Dimensions of the dynamic viscosity (?) are:

Options are :

• ML^(-1)T^(-1)
• ML^(-1)T^(-2)
• M^(-1)L^(-1)T^(-1)
• MLT^(-2)

##### Piezometers are used to measure:

Options are :

• Difference in pressure at two points
• Pressure in water channels, pipes etc
• Very low pressure
• Atmospheric pressure

##### Shear stress is directly proportional to:

Options are :

• The velocity
• The velocity
• The viscosity
• The shear strain

Options are :

• Helmholtz
• Bezin
• Newton
• Chezy
• Bernoulli

##### The specific weight of water is 1000 kg/m^(3)

Options are :

• All the above
• At normal pressure of 760 mm
• At 4�C temperature
• At mean sea level

##### In Newton's viscosity equation Larger image , the coefficient (?) is known as coefficient of:

Options are :

• Dynamic viscosity
• Simple viscosity
• All the above
• Viscosity
• Absolute viscosity

##### To avoid an interruption in the flow of a syphon, an air vessel is provided:

Options are :

• At the inlet
• At the summit
• At the outlet
• At any point between intet and outlet

Options are :

• 3/4
• 4/5
• 2/3
• 1/2

##### The magnitude of water hammer in a pipe depends upon:

Options are :

• Elastic properties of the pipe material
• Length of the pipe line
• Speed at which value is closed
• All the above
• Elastic properties of the following liquid

Options are :

• 7.5 m
• 5.0 m
• 9.81 m
• 10.30 m

##### Power transmitted through a pipe is maximum when friction head loss, is:

Options are :

• One-half of the total head supplied
• One-third of the total head supplied
• Equal to the total head supplied
• One-fouth of the total head supplied

##### If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then:

Options are :

• Cd = Cc . Cv
• Cv = Cc + Cd
• Cc = Cv/Cd
• Cr = 1 + Cv^(2)/Cd

Answer :Cd = Cc . Cv

Options are :

• A
• D
• C
• B

##### On an inclined plane, centre of pressure is located:

Options are :

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

##### Flow in pipes is turbulent if Reynold number is:

Options are :

• Between 2100 and 3000
• None of these
• More than 3000
• Less than 2100

##### The following is not a laminar flow:

Options are :

• Rise of water in plants through roots
• Flow in water pipe lines
• Flow in beds in ground water
• Flow of blood in the arteries of human body
• Flow of oil in measuring instruments

Answer :Flow in water pipe lines

##### When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as:

Options are :

• Free nappe
• Clinging nappe
• Depressed nappe
• None of these