Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.
a. Steady
b. Streamline
c. Turbulent
d. Unsteady
Q. The divergent portion of a Venturimeter is made longer than convergent portion in order to
a. Avoid the tendency of breaking away the stream of liquid
b. To minimise frictional losses
c. Both (A) and (B)
d. None of these
Q. According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C =Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)
a. A × m × i)
b. C × m × i)
c. AC × m × i)
d. mi × A × C)
Q. In a free vortex motion, the radial component of velocity everywhere is
a. Maximum
b. Minimum
c. Zero
d. Nonzero and finite
Q. Coefficient of contraction is the ratio of
a. Actual velocity of jet at vena contracta to the theoretical velocity
b. Loss of head in the orifice to the head of water available at the exit of the orifice
c. Loss of head in the orifice to the head of water available at the exit of the orifice
d. Area of jet at vena-contracta to the area of orifice
Q. The Bernoulli's equation is based on the assumption that
a. There is no loss of energy of the liquid flowing
b. The velocity of flow is uniform across any cross-section of the pipe
c. No force except gravity acts on the fluid
d. All of the above
Q. The flow in a pipe is turbulent when Reynold number is
a. Less than 2000
b. Between 2000 and 2800
c. More than 2800
d. None of these
Q. When the flow parameters at any given instant remain same at every point, then flow is said to be
a. Quasi-static
b. Steady state
c. Laminar
d. Uniform
Q. Rain drops are spherical because of
a. Viscosity
b. Air resistance
c. Surface tension forces
d. Atmospheric pressure
Q. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
a. Plus
b. Minus
c. Divide
d. None of these
Q. The sheet of water flowing over a notch or a weir is known as
a. Sill or crest
b. Nappe or vein
c. Orifice
d. None of these
Q. A structure used to dam up a stream or river over which the water flows is called
a. Orifice
b. Notch
c. Weir
d. Dam
Q. A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
a. Coincides with its centre of gravity
b. Lies above its centre of gravity
c. Lies below its centre of gravity
d. Lies between the centre of buoyancy and centre of gravity
Q. General energy equation holds for
a. Steady flow
b. Turbulent flow
c. Laminar flow
d. Non-uniform flow
Q. The buoyancy depends on
a. Mass of liquid displaced
b. Viscosity of the liquid
c. Pressure of the liquid displaced
d. Depth of immersion