Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. The centre of gravity of the volume of the liquid displaced is called
a. Centre of pressure
b. Centre of buoyancy
c. Metacentre
d. None of these
Q. The Reynold's number of a ship is __________ to its velocity and length.
a. Directly proportional
b. Inversely proportional
c. Square root of velocity
d. None of these
Q. In the above question, if the angular velocity ? is doubled, then the depth of parabola will be
a. halved
b. two times
c. four times
d. eight times
Q. The total pressure on the top of a closed cylindrical vessel competely 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. When a body is placed over a liquid, it will sink down if
a. gravitational force is equal to the upthrust of the liquid
b. gravitational force is les than the upthrust of the liquid
c. gravitational force is more than the upthrust of the liquid
d. none of the above
Q. Bernoulli's equation is applied to
a. venturimeter
b. orifice meter
c. pitot tube
d. all of these
Q. A differential manometer is used to measure
a. atmospheric pressure
b. pressure in pipes and channels
c. pressure in venturimenter
d. difference of pressures between two points in pipe
Q. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, 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. 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. An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is
a. 10 m/sec²
b. 9.81 m/sec²
c. 9.75 m/sec²
d. 9 m/sec
Q. A flow is called hyper-sonic, if the Mach number is
a. Less than unity
b. Unity
c. Between 1 and 6
d. None of these
Q. Liquids
a. Cannot be compressed
b. Occupy definite volume
c. Are not affected by change in pressure and temperature
d. None of the above
Q. When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of
a. A triangle
b. A paraboloid
c. An ellipse
d. None of these
Q. Fluid is a substance that
a. Cannot be subjected to shear forces
b. Always expands until it fills any container
c. Has the same shear stress at a point regardless of its motion
d. Cannot remain at rest under action of any shear force
Q. The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
a. Newton's law of motion
b. Newton's law of cooling
c. Newton's law of viscosity
d. Newton's law of resistance