51. The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
expands
does not change
contracts
✅ The correct answer is option C.
Hydraulics and Fluid Mechanics MCQs
52. The ratio of the inertia force to the gravity force is called Froude number.
Agree
Disagree
✅ The correct answer is option A.
53. The shear stress-strain graph for a newtonian fluid is a
straight line
parabolic curve
hyperbolic curve
elliptical
✅ The correct answer is option A.
54. The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid
Agree
Disagree
✅ The correct answer is option A.
55. When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of
a triangle
a paraboloid
an ellipse
none of these
✅ The correct answer is option B.
56. The surface tension of mercury at normal temperature is __________ that of water.
same as
lower than
higher than
✅ The correct answer is option C.
57. The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation.
same as
less than
more than
✅ The correct answer is option A.
58. The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
1/2 depth
1/2 breadth
1/2 sloping side
1/4 (depth + breadth)
✅ The correct answer is option A.
59. A flow through a long pipe at decreasing rate is called __________ uniform flow.
steady
unsteady
✅ The correct answer is option B.
60. The flow at critical depth in an open channel is called torrential flow.
Yes
No
✅ The correct answer is option B.