A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body
✅ The correct answer is option A.
Fluid Mechanics MCQs
Which of the following is used to measure the discharge ?
A. current meter
B. venturimeter
C. pitot tube
D. hotwire anemometer
✅ The correct answer is option B.
The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?
A. PA
B. pA sin 9
C. pA cos 9
D. pA tan 9
✅ The correct answer is option A.
Which of the following velocity potentials satisfies continuity equation ?
A. x2y
B. x2-y2
C. cosx
D. x2 + y2
✅ The correct answer is option B.
If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?
A. x
B. x
C. x
D. x/7
✅ The correct answer is option A.
Coefficient of velocity for Borda’s mouth piece running full is________________?
A. 0.611
B. 0.707
C. 0.855
D. 1.00
✅ The correct answer is option B.
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?
A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. cannot be predicted from the given data
✅ The correct answer is option A.
A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?
A. less than 1 m/sec
B. 1 m/sec
C. 1.5 m/sec
D. 2 m/sec
✅ The correct answer is option B.
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then_____________?
A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. none of the above
✅ The correct answer is option A.
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?
A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. inversely as the radial distance
✅ The correct answer is option B.