Fluid Mechanics

51. Euler’s dimensionless number relates the following

1. inertial force and gravity
2. viscous force and inertial force
3. viscous force and buoyancy force
4. pressure force and inertial force
5. pressure force and viscous force.

View answer

52. Falling drops of water become spheres due to the property of

1. adhesion
2. cohesion
3. surface tension
4. viscosity
5. compressibility.

View answer

53. Flow occurring in a pipeline when a valve is being opened is

1. steady
2. unsteady
3. laminar
4. vortex
5. rotational.

View answer

54. Fluid is a substance that

1. cannot be subjected to shear forces
2. always expands until it fills any container
3. has the same shear stress.at a point regardless of its motion
4. cannot remain at rest under action of any shear force
5. flows.

View answer

55. Fluid is a substance which offers no resistance to change of

1. pressure
2. flow
3. shape
4. volume
5. temperature.

View answer

56. For a body floating in a liquid the normal pressure exerted by the liquid acts at

1. bottom surface of the body
2. e.g. of the body
3. metacentre
4. all points on the surface of the body
5. all of the above.

View answer

57. For a floating body to be in equilibrium

1. meta centre should be above e.g.
2. centre of buoyancy and e.g. must lie on same vertical plane
3. a righting couple should be formed
4. all of the above
5. none of the above.

View answer

58. For a floating body to be in stable equilibrium, its metacentre should be

1. below the center of gravity
2. below the center of buoyancy
3. above the center of buoyancy
4. between e.g. and center of pressure
5. above the center of gravity.

View answer

59. For hypersonic flow, the Mach number is

1. unity
2. greater than unity
3. greater than 2
4. greater than 4
5. greater than 10.

View answer

60. For manometer, a better liquid combination is one having

1. higher surface tension
2. lower surface tension
3. surface tension is no criterion
4. high density and viscosity
5. low density and viscosity.

View answer