Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation.
a. Same as
b. Less than
c. More than
d. None of these
Q. Hot wire anemometer is used to measure
a. Pressure in gases
b. Liquid discharge
c. Pressure in liquids
d. Gas velocities
Q. Venturimeter is used to
a. Measure the velocity of a flowing liquid
b. Measure the pressure of a flowing liquid
c. Measure the discharge of liquid flowing in a pipe
d. Measure the pressure difference of liquid flowing between two points in a pipe line
Q. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
a. The weight of the body
b. More than the weight of the body
c. Less than the weight of the body
d. Weight of the fluid displaced by the body
Q. The pressure measured with the help of a pressure gauge is called
a. Atmospheric pressure
b. Gauge pressure
c. Absolute pressure
d. Mean pressure
Q. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
a. The area is horizontal
b. The area is vertical
c. The area is inclined
d. All of the above
Q. The most economical section of a rectangular channel is one which has hydraulic mean depth orhydraulic radius equal to
a. Half the depth
b. Half the breadth
c. Twice the depth
d. Twice the breadth
Q. Capillary action is due to the
a. Surface tension
b. Cohesion of the liquid
c. Adhesion of the liquid molecules and the molecules on the surface of a solid
d. All of the above
Q. The intensity of pressure on an immersed surface __________ with the increase in depth.
a. Does not change
b. Increases
c. Decreases
d. None of these
Q. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
a. Increase
b. Decrease
c. Remain same
d. Increase/decrease depending on depth of immersion
Q. A flow through a long pipe at constant rate is called
a. Steady uniform flow
b. Steady non-uniform flow
c. Unsteady uniform flow
d. Unsteady non-uniform flow
Q. Choose the wrong statement
a. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
b. Viscosity is due primarily to interaction between fluid molecules
c. Viscosity of liquids decreases with increase in temperature
d. Viscosity of liquids is appreciably affected by change in pressure
Q. A perfect gas
a. Has constant viscosity
b. Has zero viscosity
c. Is in compressible
d. None of the above
Q. In a free nappe,
a. The pressure below the nappe is atmospheric
b. The pressure below the nappe is negative
c. The pressure above the nappe is atmospheric
d. The pressure above the nappe is negative