Most Frequently Asked Fluid Mechanics Problems Quiz questions for competitive exams

__Fluid Mechanics Multiple Choice Questions and Answers List__

**1. Pascal-second is the unit of _____.****2. An ideal fluid is _____.****3. The unit of kinematic viscosity is _____.****4. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is****5. The viscosity of a gas _____.****6. Newton's law of viscosity relates _____.****7. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be _____.****8. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is****9. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to****10. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of****11. Centre of buoyancy always _____.****12. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will****13. Metacentric height for small values of angle of heel is the distance between the****14. A floating body is said to be in a state of stable equilibrium****15. The increase in meta centric height****16. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is****17. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as****18. If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then****19. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies****20. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to****21. 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****22. The horizontal component of force on a curved surface is equal to the****23. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then****24. The eddy viscosity for turbulent flow is****25. Flow at constant rate through a tapering pipe is****26. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is****27. When the velocity distribution is uniform over the cross-section, the correction factor for momentum is****28. Least possible value of correction factor for****29. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is****30. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is****31. The continuity equation****pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid****32. Which of the following velocity potentials satisfies continuity equation ?****33. The motion of air mass in a tornado is a****34. In a forced vortex motion, the velocity of flow is****35. Stream lines and path lines always coincide in case of****36. Equation of continuity is based on the principle of conservation of****37. In steady flow of a fluid, the total accele ration of any fluid particle****38. The pitot tube is used to measure****39. Hot wire anemometer is used to measure****40. The theoretical value of coefficient of contraction of a sharp edged orifice is****41. Which of the following is used to measure the discharge ?****42. Select the incorrect statement.****43. Size of a venturimeter is specified by****44. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by****45. The discharge through a V- notch varies as****46. Which of the following is an incorrect statement ?****47. Coefficient of velocity of venturimeter****48. The pressure at the summit of a syphon is****49. Any between two stream lines represents****50. Coefficient of velocity for Borda's mouth piece running full is ______.**
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