251. The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is
✅ The correct answer is option C.
Hydraulics and Fluid Mechanics MCQs
252. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
continuity equation
Bernoulli’s equation
Pascal’s law
Archimede’s principle
✅ The correct answer is option B.
253. Laminar flow __________ place at very low velocities.
takes
does not take
✅ The correct answer is option A.
254. A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
0.46
0.64
0.78
0.87
✅ The correct answer is option B.
255. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)
0.855 a2gH
1.855 aH2g
1.585 a2gH
5.85 aH2g
✅ The correct answer is option A.
256. In the manufacturing of lead shots, the property of surface tension is utilised.
Agree
Disagree
✅ The correct answer is option A.
257. A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
real fluid
ideal fluid
newtonian fluid
non-newtonian fluid
✅ The correct answer is option C.
258. The force present in a moving liquid is
inertia force
viscous force
gravity force
all of these
✅ The correct answer is option D.
259. The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)
K.ρ
K/ρ
ρ/K
K.ρ
✅ The correct answer is option B.
260. Re-entrant or Borda’s mouthpiece is an __________ mouthpiece.
internal
external
✅ The correct answer is option A.