231. If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
0.417 H5/2
1.417 H5/2
4.171 H5/2
7.141 H5/2
✅ The correct answer is option B.
Hydraulics and Fluid Mechanics MCQs
232. A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
it is easier to see through the glass tube
glass tube is cheaper than a metallic tube
it is not possible to conduct this experiment with any other tube
all of the above
✅ The correct answer is option A.
233. The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid
Agree
Disagree
✅ The correct answer is option A.
234. 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.
235. The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
2gH
H2g
2gH
2gH
✅ The correct answer is option D.
236. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is
3.53 kN
33.3 kN
35.3 kN
none of these
✅ The correct answer is option C.
237. 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.
238. The ratio of the inertia force to the gravity force is called Froude number.
Agree
Disagree
✅ The correct answer is option A.
239. The shear stress-strain graph for a newtonian fluid is a
straight line
parabolic curve
hyperbolic curve
elliptical
✅ The correct answer is option A.
240. The surface tension of mercury at normal temperature is __________ that of water.
same as
lower than
higher than
✅ The correct answer is option C.