241. 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.
Hydraulics and Fluid Mechanics MCQs
242. 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.
243. A flow through a long pipe at decreasing rate is called __________ uniform flow.
steady
unsteady
✅ The correct answer is option B.
244. According to Manning’s formula, the discharge through an open channel is (where M = Manning’s constant)
A x M x m1/2 x i2/3
A x M x m2/3 x i1/2
A1/2 x M2/3 x m x i
A2/3 x M1/3 x m x i
✅ The correct answer is option B.
245. A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid.
TRUE
FALSE
✅ The correct answer is option A.
246. An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.
free
partially
full
✅ The correct answer is option C.
247. A flow is called sub-sonic, if the Mach number is
less than unity
unity
between 1 and 6
more than 6
✅ The correct answer is option A.
248. The mass per unit volume of a liquid at a standard temperature and pressure is called
specific weight
mass density
specific gravity
none of these
✅ The correct answer is option B.
249. If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.
TRUE
FALSE
✅ The correct answer is option B.
250. A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
Correct
Incorrect
✅ The correct answer is option A.