Most Frequently Asked Fluid Mechanics Problems Quiz questions for competitive exams
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 ______.
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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