Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
a. Less
b. More
c. Equal
d. Less at low temperature and more at high temperature
Q. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angularvelocity, the pressure
a. Varies as the square of the radial distance
b. Increases linearly as its radial distance
c. Increases as the square of the radial distance
d. Decreases as the square of the radial distance
Q. Which of the following is the unit of kinematic viscosity?
a. Pascal
b. Poise
c. Stoke
d. Faraday
Q. Reynold's number is the ratio of the inertia force to the
a. Surface tension force
b. Viscous force
c. Gravity force
d. Elastic force
Q. A differential manometer is used to measure
a. Atmospheric pressure
b. Pressure in pipes and channels
c. Pressure in Venturimeter
d. Difference of pressures between two points in a pipe
Q. In a venturi-flume, the flow takes place at
a. Atmospheric pressure
b. Gauge pressure
c. Absolute pressure
d. None of these
Q. The normal stress is same in all directions at a point in a fluid
a. Only when the fluid is frictionless
b. Only when the fluid is incompressible and has zero viscosity
c. When there is no motion of one fluid layer relative to an adjacent layer
d. Irrespective of the motion of one fluid layer relative to an adjacent layer
Q. The highest efficiency is obtained with a channel of __________ section.
a. Circular
b. Square
c. Rectangular
d. Trapezoidal
Q. Which of the following manometer has highest sensitivity?
a. U-tube with water
b. Inclined U-tube
c. U-tube with mercury
d. Micro-manometer with water
Q. The velocity corresponding to Reynold number of 2800, is called
a. Sub-sonic velocity
b. Super-sonic velocity
c. Lower critical velocity
d. Higher critical velocity
Q. For a floating body to be in equilibrium
a. Meta centre should be above e.g.
b. Centre of buoyancy and e.g. must lie on same vertical plane
c. A righting couple should be formed
d. All of the above
Q. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
a. 0.5 gH
b. 0.707 a. gH
c. 0.855 a. gH
d. a. gH