Agree
Disagree
✅ The correct answer is option B.
Hydraulics and Fluid Mechanics MCQs
The dynamic viscosity of the liquid __________ with rise in temperature.
remain unaffected
increases
decreases
✅ The correct answer is option C.
The pressure at a stagnation point is always low.
Agree
Disagree
✅ The correct answer is option B.
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
equal to
one-third
two-third
three-fourth
✅ The correct answer is option C.
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by
✅ The correct answer is option D.
The total pressure on the bottom of a closed cylindrical vessel completely filled up with a liquid is the sum of the total centrifugal pressure and the weight of the liquid in the vessel.
Correct
Incorrect
✅ The correct answer is option A.
The hydraulic gradient line is always parallel to the centre line of the pipe.
Correct
Incorrect
✅ The correct answer is option B.
According to Newton’s law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
equal to
directly proportional
inversely proportional
✅ The correct answer is option B.
The sheet of water flowing over a notch or a weir is known as
sill or crest
nappe or vein
orifice
none of these
✅ The correct answer is option B.
A channel is said to be of most economical cross-section, if
it gives maximum discharge for a given cross-sectional area and bed slope
it has minimum wetted perimeter
it involves lesser excavation for the designed amount of discharge
all of the above
✅ The correct answer is option D.