Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. Stoke is the unit of
a. Kinematic viscosity in C. G. S. units
b. Kinematic viscosity in M. K. S. units
c. Dynamic viscosity in M. K. S. units
d. Dynamic viscosity in S. I. units
Q. The vapour pressure over the concave surface is
a. Less man the vapour pressure over the plane surface
b. Equal to the vapour pressure over the plane surface
c. Greater than the vapour pressure over the plane surface
d. Zero
Q. The velocity at which the flow changes from laminar flow to turbulent flow is called
a. Critical velocity
b. Velocity of approach
c. Sub-sonic velocity
d. Super-sonic velocity
Q. Mercury is often used in barometer because
a. It is the best liquid
b. The height of barometer will be less
c. Its vapour pressure is so low that it may be neglected
d. Both (B) and (C)
Q. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
a. The pressure on the wall at the liquid level is minimum
b. The pressure on the bottom of the wall is maximum
c. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
d. The pressure on the bottom of the wall is zero
Q. Center of pressure compared to e.g. is
a. Above it
b. Below it
c. At same point
d. Above or below depending on area of body
Q. The centre of gravity of the volume of the liquid displaced by an immersed body is called
a. Centre of gravity
b. Centre of pressure
c. Metacentre
d. Centre of buoyancy
Q. Gradually varied flow is
a. Steady uniform
b. Non-steady non-uniform
c. Non-steady uniform
d. Steady non- uniform
Q. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to
a. Head of water (h)
b. h²
c. V/T
d. h/2
Q. According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l =Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)
a. flv²/2gd
b. flv²/gd
c. 3flv²/2gd
d. 4flv²/2gd
Q. According to Bernoulli's equation for steady ideal fluid flow
a. Principle of conservation of mass holds
b. Velocity and pressure are inversely proportional
c. Total energy is constant throughout
d. The energy is constant along a streamline but may vary across streamlines
Q. The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.
a. Equal to
b. One-half
c. Three fourth
d. Double
Q. Principle of similitude forms the basis of
a. Comparing two identical equipments
b. Designing models so that the result can be converted to prototypes
c. Comparing similarity between design and actual equipment
d. Hydraulic designs