221. The centre of pressure acts __________ the centre of gravity of immersed surface.
at
above
below
✅ The correct answer is option C.
Hydraulics and Fluid Mechanics MCQs
222. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.
Correct
Incorrect
✅ The correct answer is option A.
223. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
surface tension
compressibility
capillarity
viscosity
✅ The correct answer is option D.
224. A hemispherical tank of radius (R) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to lower the level of liquid from (H1) to (H2) will be
none of the above
✅ The correct answer is option C.
225. The total head of a liquid particle in motion is equal to
pressure head + kinetic head + potential head
pressure head – (kinetic head + potential head)
potential head – (pressure head + kinetic head)
kinetic head – (pressu
✅ The correct answer is option A.
226. The Cippoletti weir is a __________ weir.
rectangular
triangular
trapezoidal
circular
✅ The correct answer is option C.
227. The coefficient of venturifiume, generally, lies between
0.3 to 0.45
0.50 to 0.75
0.75 to 0.95
0.95 to 1.0
✅ The correct answer is option D.
228. The flow in a pipe is neither laminar nor turbulent when Reynold number is
less than 2000
between 2000 and 2800
more than 2800
none of these
✅ The correct answer is option B.
229. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
2.89 kN
8.29 kN
9.28 kN
28.9 kN
✅ The correct answer is option B.
230. The tangential velocity of the water element having a free vortex is
directly proportional to its distance from the centre
inversely proportional to its distance from the centre
directly proportional to its (distance)2 from the centre
inversely proportional
✅ The correct answer is option B.