Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. The coefficient of discharge for an external mouthpiece depends upon
a. Velocity of liquid
b. Pressure of liquid
c. Area of mouthpiece
d. Length of mouthpiece
Q. The specific weight of water is 1000 kg/m3
a. At normal pressure of 760 mm
b. At 4°C temperature
c. At mean sea level
d. All the above
Q. If the depth of water in an open channel is greater than the critical depth, the flow is called
a. Critical flow
b. Turbulent flow
c. Tranquil flow
d. Torrential flow
Q. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
a. Steady flow
b. Turbulent flow
c. Vortex flow
d. Uniform flow
Q. The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.
a. Equal to
b. Less than
c. More than
d. None of these
Q. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be
a. 500 kg
b. 1000 kg
c. 1500 kg
d. 2000 kg
Q. The velocity at which the laminar flow stops, is known as
a. Velocity of approach
b. Lower critical velocity
c. Higher critical velocity
d. None of these
Q. The line of action of the buoyant force acts through the
a. Centroid of the volume of fluid vertically above the body
b. Centre of the volume of floating body
c. Center of gravity of any submerged body
d. Centroid of the displaced volume of fluid
Q. The buoyancy depends upon the
a. Weight of the liquid displaced
b. Pressure with which the liquid is displaced
c. Viscosity of the liquid
d. Compressibility of the liquid
Q. Two dimensional flows 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 plane
Q. Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
a. Lift
b. Drag
c. Stagnation pressure
d. Bulk modulus
Q. Which of the following is dimensionless?
a. Specific weight
b. Specific volume
c. Specific speed
d. Specific gravity
Q. Coefficient of resistance is the ratio of
a. Actual velocity of jet at vena -contracta to the theoretical velocity
b. Area of jet at vena-contracta to the area of orifice
c. Loss of head in the orifice to the head of water available at the exit of the orifice
d. Actual discharge through an orifice to the theoretical discharge
Q. Mercury does not wet glass. This is due to property of liquid known as
a. Adhesion
b. Cohesion
c. Surface tension
d. Viscosity
Q. A flow in which __________ force is dominating over the viscosity is called turbulent flow.
a. Elastic
b. Surface tension
c. Viscous
d. Inertia