Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6m, then the weight of the body is
a. 3.53 kN
b. 33.3 kN
c. 35.3 kN
d. None of these
Q. The force per unit length is the unit of
a. Surface tension
b. Compressibility
c. Capillarity
d. Viscosity
Q. When the Mach number is more than 6, the flow is called
a. Sub-sonic flow
b. Sonic flow
c. Super -sonic flow
d. Hyper-sonic flow
Q. The upper surface of a weir over which water flows is known is
a. Crest
b. Nappy
c. Sill
d. Weir top
Q. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)
a. Q = (2/3) Cd × b × (2g) × (H2 - H1)
b. Q = (2/3) Cd × b × (2g) × (H2 1/2- H1 1/2)
c. Q = (2/3) Cd × b × (2g) × (H2 3/2 - H1 3/2)
d. Q = (2/3) Cd × b × (2g) × (H2 2 - H1 2)
Q. The Euler's equation for the motion of liquids is based upon the assumption that
a. The fluid is non - viscous, homogeneous and incompressible
b. The velocity of flow is uniform over the section
c. The flow is continuous, steady and along the stream line
d. All of the above
Q. The ratio of the inertia force to the viscous force is called
a. Reynold's number
b. Froude's number
c. Weber's number
d. Euler's number
Q. The total energy of a liquid particle in motion is equal to
a. Pressure energy + kinetic energy + potential energy
b. Pressure energy - (kinetic energy + potential energy)
c. Potential energy - (pressure energy + kinetic energy
d. Kinetic energy - (pressure energy + potential energy)
Q. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?
a. Venturimeter
b. Orifice plate
c. Hot wire anemometer
d. Pitot tube
Q. The force present in a moving liquid is
a. Inertia force
b. Viscous force
c. Gravity force
d. All of these
Q. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?
a. 10 m/sec
b. 25 m/sec
c. 2 m/sec
d. 50 m/sec
Q. The flow in which the velocity vector is identical in magnitude and direction at every point, for anygiven instant, is known as
a. One dimensional flow
b. Uniform flow
c. Steady flow
d. Turbulent flow