Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. Specific weight of sea water is more that of pure water because it contains
a. Dissolved air
b. Dissolved salt
c. Suspended matter
d. All of the above
Q. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
a. Less than
b. More than
c. Equal to
d. None of these
Q. The factional resistance of a pipe varies approximately with __________ of the liquid.
a. Pressure
b. Velocity
c. Square of velocity
d. Cube of velocity
Q. For measuring flow by a Venturimeter, if should be installed in
a. Vertical line
b. Horizontal line
c. Inclined line with flow downward
d. In any direction and in any location
Q. The ratio of the inertia force to the elastic force is called
a. Reynold's number
b. Froude's number
c. Weber's number
d. Mach number
Q. All the terms of energy in Bernoulli's equation have dimension of
a. Energy
b. Work
c. Mass
d. Length
Q. The pressure at a point 4 m below the free surface of water is
a. 19.24 kPa
b. 29.24 kPa
c. 39.24 kPa
d. 49.24 kPa
Q. Specific weight of water in S.I. units is equal to
a. 1000 N/m 3
b. 10000 N/m3
c. 9.81 × 103 N/m3
d. m3
Q. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
a. Less than
b. More than
c. Equal to
d. None of these
Q. Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.
a. Sum
b. Different
c. Product
d. Ratio
Q. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
a. Equal to
b. Less than
c. More than
d. None of these
Q. The tangential velocity of the water element having a free vortex is
a. Directly proportional to its distance from the centre
b. Inversely proportional to its distance from the centre
c. Directly proportional to its (distance) 2 from the centre
d. Inversely proportional to its (distance) 2 from the centre
Q. The horizontal component of buoyant force is
a. Negligible
b. Same as buoyant force
c. Zero
d. None of the above