Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. For hypersonic flow, the Mach number is
a. Unity
b. Greater than unity
c. Greater than 2
d. Greater than 4
Q. The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
a. 2gH
b. H × g)
c. 2g × H
d. 2gh)
Q. For pipes, laminar flow occurs when Reynolds number is
a. Less than 2000
b. Between 2000 and 4000
c. More than 4000
d. Less than 4000
Q. When the flow in an open channel is gradually varied, the flow is said to be
a. Steady uniform flow
b. Steady non-uniform flow
c. Unsteady uniform flow
d. Unsteady non-uniform flow
Q. In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, thenthe mouthpiece is said to be
a. Running full
b. Running free
c. Partially running full
d. Partially running free
Q. The units of kinematic viscosity are
a. Metres² per sec
b. kg sec/metre
c. Newton-sec per metre
d. Newton-sec per metre
Q. The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
a. Expands
b. Does not change
c. Contracts
d. None of these
Q. Newton's law of viscosity is a relationship between
a. Shear stress and the rate of angular distortion
b. Shear stress and viscosity
c. Shear stress, velocity and viscosity
d. Pressure, velocity and viscosity
Q. The total energy line lies over the hydraulic gradient line by an amount equal to the
a. Pressure head
b. Velocity head
c. Pressure head + velocity head
d. Pressure head - velocity head
Q. Choose the wrong statement
a. The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface
b. The horizontal component acts through the center of pressure for the vertical projection
c. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
d. The vertical component passes through the center of pressure of the volume
Q. In open channels, the specific energy is the
a. Total energy per unit discharge
b. Total energy measured with respect to the datum passing through the bottom of the channel
c. Total energy measured above the horizontal datum
d. Kinetic energy plotted above the free surface of water
Q. For a floating body to be in stable equilibrium, its metacentre should be
a. Below the center of gravity
b. Below the center of buoyancy
c. Above the center of buoyancy
d. Above the center of gravity
Q. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
a. 2.89 kN
b. 8.29 kN
c. 9.28 kN
d. 28.9 kN
Q. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surfacewill be
a. 1000 kg
b. 4000 kg
c. 2000 kg
d. 8000 kg
Q. If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.
a. Neutral
b. Stable
c. Unstable
d. None of these