Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. An ideal flow of any fluid must fulfill the following
a. Newton's law of motion
b. Newton's law of viscosity
c. Pascal' law
d. Continuity equation
Q. The flow in a pipe or channel is said to be uniform when
a. The liquid particles at all sections have the same velocities
b. The liquid particles at different sections have different velocities
c. The quantity of liquid flowing per second is constant
d. Each liquid particle has a definite path
Q. Surface tension
a. Acts in the plane of the interface normal to any line in the surface
b. Is also known as capillarity
c. Is a function of the curvature of the interface
d. Decreases with fall in temperature
Q. Select the wrong statement
a. An equivalent pipe is treated as an ordinary pipe for all calculations
b. The length of an equivalent pipe is equal to that of a compound pipe
c. The discharge through an equivalent pipe is equal to that of a compound pipe
d. The diameter of an equivalent pipe is equal to that of a compound pipe
Q. manometers because Alcohol is used in
a. It has low vapour pressure
b. It is clearly visible
c. It has low surface tension
d. It can provide longer column due to low density
Q. If no resistance is encountered by displacement, such a substance is known as
a. Fluid
b. Water
c. Gas
d. Ideal fluid
Q. The kinematic viscosity is the
a. Ratio of absolute viscosity to the density of the liquid
b. Ratio of density of the liquid to the absolute viscosity
c. Product of absolute viscosity and density of the liquid
d. Product of absolute viscosity and mass of the liquid
Q. The viscosity of water is __________ than that of mercury.
a. Higher
b. Lower
c. Same as
d. None of these
Q. Surface energy per unit area of a surface is numerically equal to
a. Atmospheric pressure
b. Surface tension
c. Force of adhesion
d. Force of cohesion
Q. The specific weight of sea water is __________ that of pure water.
a. Same as
b. Less than
c. More than
d. None of these
Q. Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?
a. Venturimeter
b. Orifice plate
c. Nozzle
d. All of the above
Q. An internal mouthpiece is said to be running free if the length of the mouthpiece is __________the diameter of the orifice.
a. Less than twice
b. More than twice
c. Less than three times
d. More than three times
Q. An ideal flow of any fluid must satisfy
a. Pascal law
b. Newton's law of viscosity
c. Boundary layer theory
d. Continuity equation