71. A flow whose streamline is represented by a straight line, is called __________ dimensional flow.
one
two
three
four
✅ The correct answer is option A.
Hydraulics and Fluid Mechanics MCQs
72. The specific weight of water in S.I. units is taken as
9.81 kN/m3
9.81 x 103 kN/m3
9.81 x 10-6 N/mm3
any one of these
✅ The correct answer is option A.
73. Bernoulli’s equation is applied to
venturimeter
orifice meter
pitot tube
all of these
✅ The correct answer is option D.
74. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
200 kg/m3
400 kg/m3
600 kg/m3
800 kg/m3
✅ The correct answer is option D.
75. Euler’s number is the ratio of __________ force to pressure force.
inertia
gravity
viscous
✅ The correct answer is option A.
76. The vacuum pressure is always the negative gauge pressure.
Yes
No
✅ The correct answer is option A.
77. The factional resistance of a pipe varies approximately with __________ of the liquid.
pressure
velocity
square of velocity
cube of velocity
✅ The correct answer is option C.
78. An air vessel is provided at the summit in a syphon to
avoid interruption in the flow
increase discharge
increase velocity
maintain pressure diff
✅ The correct answer is option A.
79. 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.
80. 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.