Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. The shear stress-strain graph for a Newtonian fluid is a
a. Straight line
b. Parabolic curve
c. Hyperbolic curve
d. Elliptical
Q. The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as
a. One dimensional flow
b. Uniform flow
c. Steady flow
d. Turbulent flow
Q. Uniform flow occurs when
a. The direction and magnitude of the velocity at all points are identical
b. The velocity of successive fluid particles, at any point, is the same at successive periods of time
c. The magnitude and direction of the velocity do not change from point to point in the fluid
d. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure
Q. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
a. Minimum
b. Maximum
c. Zero
d. Could be any value
Q. The discharge through a channel of trapezoidal section is maximum when
a. Width of channel at the top is equal to twice the width at the bottom
b. Depth of channel is equal to the width at the bottom
c. The sloping side is equal to half the width at the top
d. The sloping side is equal to the width at the bottom
Q. Piezometer is used to measure
a. Pressure in pipe, channels etc.
b. Atmospheric pressure
c. Very low pressures
d. Difference of pressure between two points
Q. The point at which the resultant pressure on an immersed surface acts, is known as
a. Centre of gravity
b. Centre of depth
c. Centre of pressure
d. Centre of immersed surface
Q. Choose the wrong statement
a. Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
b. Buoyant force is equal to the weight of the liquid displaced
c. The point through which buoyant force acts, is called the center of buoyancy
d. Center of buoyancy is located above the center of gravity of the displaced liquid
Q. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be
a. 2 metres of water column
b. 3 metres of water column
c. 3.5 metres of water column
d. 4 m of water column
Q. The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
a. Directly proportional to (radius)2
b. Inversely proportional to (radius)2
c. Directly proportional to (radius)4
d. Inversely proportional to (radius)4
Q. The flow which neglects changes in a transverse direction is known as
a. One dimensional flow
b. Uniform flow
c. Steady flow
d. Turbulent flow
Q. The mass per unit volume of a liquid at a standard temperature and pressure is called
a. Specific weight
b. Mass density
c. Specific gravity
d. None of these
Q. A large Reynold number is indication of
a. Smooth and streamline flow
b. Laminar flow
c. Steady flow
d. Highly turbulent flow
Q. Which of the following statement is wrong?
a. A flow whose streamline is represented by a curve is called two dimensional flow.
b. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
c. The length of divergent portion in a Venturimeter is equal to the convergent portion.
d. A pitot tube is used to measure the velocity of flow at the required point in a pipe.
Q. A flow in which the volume of a fluid and its density does no change during the flow is called
a. incompressible
b. compressible