Fluid Mechanics

51. drometer is used to determine

1. specific gravity of liquids
2. specific gravity of solids
3. specific gravity of gases
4. relative humidity
5. density.

View answer

52. During the opening of a valve in a pipe line, the flow is

1. steady
2. unsteady
3. uniform
4. laminar
5. free vortex type.

View answer

53. Dynamic viscosity of most of the gases with rise in temperature

1. increases
2. decreases
3. remains unaffected
4. unpredictable
5. none of the above.

View answer

54. Dynamic viscosity of most of the liquids with rise in temperature

1. increases
2. decreases
3. remains unaffected
4. unpredictable
5. none of the above.

View answer

55. 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

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

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

View answer

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

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

View answer

58. 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

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

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

View answer

60. 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