Fluid Mechanics MCQs

1. If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then_____________?

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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.

2. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?

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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.

5. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?

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A. 0.40 cm
B. 0.20 cm
C. 0.10 cm
D. 0.05 cm
✅ The correct answer is option B.