51. An ideal fluid is_______________?
A. one which obeys Newton’s law of viscosity
B. frictionless and incompressible
C. very viscous
D. frictionless and compressible
✅ The correct answer is option B.
Fluid Mechanics MCQs
52. The eddy viscosity for turbulent flow is______________?
A. a function of temperature only
B. a physical property of the fluid.
C. dependent on the flow
D. independent of the flow
✅ The correct answer is option C.
53. When the velocity distribution is uniform over the cross-section, the correction factor for momentum is__________________?
A. 0
B. 1
C. 4/3
D. 2
✅ The correct answer is option B.
54. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as__________________?
A. center of gravity
B. center of buoyancy
C. center of pressure
D. metacentre
✅ The correct answer is option C.
55. For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?
A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness
✅ The correct answer is option C.
56. Which of the following has highest coefficient of discharge ?
A. sharp edged orifice
B. venturimeter
C. Borda’s mouthpiece running full
D. CipoUetti weir
✅ The correct answer is option B.
57. The losses are more in_________________?
A. laminar flow
B. transition flow
C. turbulent flow
D. critical flow
✅ The correct answer is option C.
58. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?
A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above
✅ The correct answer is option C.
59. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above
✅ The correct answer is option B.
60. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
A. 1 m
B. 10m
C. 100m
D. none of the above
✅ The correct answer is option C.