Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
a. Higher than the surface of liquid
b. The same as the surface of liquid
c. Lower than the surface of liquid
d. Unpredictable
Q. The ratio of the inertia force to the __________ is called Euler's number.
a. Pressure force
b. Elastic force
c. Surface tension force
d. Viscous force
Q. A one dimensional flow is one which
a. Is uniform flow
b. Is steady uniform flow
c. Takes place in straight lines
d. Involves zero transverse component of flow
Q. According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
a. A × M × m1/2 × i2/3
b. A × M × m2/3 × i1/2
c. A1/2 × M 2/3 × m × i
d. A2/3 × M1/3 × m × i
Q. An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called
a. Weir
b. Notch
c. Orifice
d. None of these
Q. The property of fluid by virtue of which it offers resistance to shear is called
a. Surface tension
b. Adhesion
c. Cohesion
d. Viscosity
Q. Coefficient of velocity is defined as 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. Actual discharge through an orifice to the theoretical discharge
d. None of the above
Q. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
a. 200 kg/m3
b. 400 kg/m3
c. 600 kg/m3
d. 800 kg/m3
Q. A fluid in equilibrium can't sustain
a. Tensile stress
b. Compressive stress
c. Shear stress
d. Bending stress
Q. When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
a. Less than
b. More than
c. Equal to
d. None of these
Q. A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
a. Equal to
b. Less than
c. More than
d. None of these
Q. The bulk modulus of elasticity
a. Has the dimensions of 1/pressure
b. Increases with pressure
c. Is large when fluid is more compressible
d. Is independent of pressure and viscosity
Q. Kinematic viscosity is equal to
a. Dynamic viscosity/density
b. Dynamic viscosity × density
c. Density/dynamic viscosity
d. 1/dynamic viscosity × density
Q. The atmospheric pressure at sea level is
a. 103 kN/m2
b. 10.3 m of water
c. 760 mm of mercury
d. All of these
Q. The conditions for the stable equilibrium of a floating body are
a. The metacentre should lie above the center of gravity
b. The center of buoyancy and the center of gravity must lie on the same vertical line
c. A righting couple should be formed
d. All the above are correct