MCQOPTIONS
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MCQOPTIONS
This section includes 88 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
An object weighs 60 gm in air, 50 gm in water and 40 gm in oil. Then the specific gravity of the oil will be _____. |
| A. | 0.25 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 52. |
A liquid is compressed in a cylinder from a volume of 0.02 m3 at 200 N/m2 pressure to a volume of 0.01 m3 at 400 N/m2 pressure. The bulk modulus of elasticity of the liquid is |
| A. | 500 N/m2 |
| B. | 1000 N/m2 |
| C. | 400 N/m2 |
| D. | 600 N/m2 |
| Answer» D. 600 N/m2 | |
| 53. |
At constant temperature, the fluid whose viscosity does not change with the rate of deformation, is called: |
| A. | Read fluid |
| B. | Non-Newtonian fluid |
| C. | Ideal fluid |
| D. | Newtonian fluid |
| Answer» E. | |
| 54. |
If for a fluid in motion, pressure at a point is same in all direction, then the fluid is |
| A. | A real Fluid |
| B. | A Newtonian Fluid |
| C. | An Ideal Fluid |
| D. | A non-Newtonian Fluid |
| Answer» D. A non-Newtonian Fluid | |
| 55. |
Match List-I with List-II and choose the correct answer from the options given below List-I(Fluid property) List-II(Flow Phenomenon)A. Compressibilitya. The flow of real fluid past a tiny sphere B. Gravityb. CavitationC. Viscosityc. Hydraulic jumpD. Vapour pressure d. Flight of supersonic aircraft |
| A. | A - c, B - d, C - b, D - a |
| B. | A - c, B - d, C - a, D - b |
| C. | A - d, B - c, C - a, D - b |
| D. | A - d, B - c, C - b, D - a |
| Answer» D. A - d, B - c, C - b, D - a | |
| 56. |
1.0 N/m2 is equal to: |
| A. | 1.0 Pa |
| B. | 1.0 kPa |
| C. | 1.0 MPa |
| D. | 1.0 bar |
| Answer» B. 1.0 kPa | |
| 57. |
In the phenomenon of Cavitation, the characteristic fluid property involved is; |
| A. | Surface tension |
| B. | Viscosity |
| C. | Bulk modulus of elasticity |
| D. | Vapour pressure |
| Answer» E. | |
| 58. |
In Red Wood Viscometer ______. |
| A. | Absolute value of viscosity is determined |
| B. | Part of the head of fluid is utilised in overcoming friction |
| C. | Fluid discharges through orifice with negligible velocity |
| D. | Comparison of viscosity is done |
| Answer» B. Part of the head of fluid is utilised in overcoming friction | |
| 59. |
A Newtonian fluid is one which |
| A. | is viscous but incompressible |
| B. | has a linear relationship between the shear stress and the rate of angular deflection |
| C. | exhibits an increase in viscosity with increasing rate of deformation |
| D. | exhibits an decrease in viscosity with increasing rate of deformation |
| Answer» C. exhibits an increase in viscosity with increasing rate of deformation | |
| 60. |
A steam turbine is supplied with steam at a pressure of 20 bar gauge. After expansion in the steam turbine, the steam passes to condenser which is maintained at a vacuum of 250 mm of mercury by means of pumps. The inlet and exhaust steam pressures will be nearly |
| A. | 2101 kPa and 68 kPa |
| B. | 2430 kPa and 78 kPa |
| C. | 2101 kPa and 78 kPa |
| D. | 2430 kPa and 68 kPa |
| Answer» B. 2430 kPa and 78 kPa | |
| 61. |
Pseudo-plastic is a fluid for which |
| A. | Dynamic viscosity decreases as the rate of shear increases |
| B. | Newton’s law of viscosity holds good |
| C. | Dynamic viscosity increases as the rate of shear increases |
| D. | Dynamic viscosity increases with the time for which shearing forces are applied |
| Answer» B. Newton’s law of viscosity holds good | |
| 62. |
A plate weighting 150 N and measuring 0.8 m × 0.8 m just slides down an inclined plane over an oil film of 1.2 mm thickness for an inclination of 30° and velocity of 0.2 m/s. Then the viscosity of the oil used is |
| A. | 0.3 Ns/m2 |
| B. | 0.4 Ns/m2 |
| C. | 0.5 Ns/m2 |
| D. | 0.7 Ns/m2 |
| Answer» E. | |
| 63. |
Match List-I (Fluid properties) with List-II (Related terms) and select the correct answer using the given lists:List-IList-IIA. Capillaritya. CavitationB. Vapour pressureb. Density of waterC. Viscosityc. Shear forcesD. Specific gravityd. Surface tension |
| A. | A-a, B-d, C-b, D-c |
| B. | A-a, B-d, C-c, D-b |
| C. | A-d, B-a, C-b, D-c |
| D. | A-d, B-a, C-c, D-b |
| Answer» E. | |
| 64. |
Alcohol is used as manometers because |
| A. | it has low vapor pressure |
| B. | it is clearly visible |
| C. | it has low surface tension |
| D. | it can provide longer column due to low density |
| Answer» E. | |
| 65. |
Dynamic viscosity of water in comparison to mercury is |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | Unpredictable |
| Answer» C. Same | |
| 66. |
In the figure given above, for the ideal fluid, the curve that is applicable is: |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 67. |
Dynamic viscosity increases with the rate of shear increase for |
| A. | dilatant fluid |
| B. | pseudoplastic fluid |
| C. | rheopectic fluid |
| D. | thixotropic fluid |
| Answer» B. pseudoplastic fluid | |
| 68. |
An ideal fluid is one which is: |
| A. | non-viscous |
| B. | incompressible |
| C. | incompressible and non-viscous |
| D. | non-viscous and frictionless |
| Answer» D. non-viscous and frictionless | |
| 69. |
Find the correct pair |
| A. | Kinematic viscosity – ρ/µ (Density/dynamic viscosity) |
| B. | Fluid of zero viscosity – Ideal fluid |
| C. | Ideal fluid – kinematic viscosity |
| D. | Viscous fluid – Fluid of zero viscosity |
| Answer» C. Ideal fluid – kinematic viscosity | |
| 70. |
If no resistance is encountered by displacement, such a substance is known as _____. |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal Fluid |
| Answer» E. | |
| 71. |
Ideal fluid is one which has no |
| A. | Viscosity |
| B. | Surface tension |
| C. | Both viscosity and surface tension |
| D. | None of the options |
| Answer» D. None of the options | |
| 72. |
Poise can also be expressed as |
| A. | Dyne-cm/s2 |
| B. | Dyne-cm/s |
| C. | Dyne-s/cm |
| D. | Dyne-s/cm2 |
| Answer» E. | |
| 73. |
Kinematic viscosity is equal to : |
| A. | Dynamic viscosity/density |
| B. | Dynamic viscosity × density |
| C. | Density/dynamic viscosity |
| D. | 1/dynamic viscosity × density |
| Answer» B. Dynamic viscosity × density | |
| 74. |
Kinematic viscosity of air at 20°C is given to be 1.6 × 10-5 m2/s. Its kinematic viscosity at 70°C will be approximately |
| A. | 2.2 × 10-5 m2/s |
| B. | 1.6 × 10-5 m2/s |
| C. | 1.2 × 10-5 m2/s |
| D. | 3.2 × 10-5 m2/s |
| Answer» B. 1.6 × 10-5 m2/s | |
| 75. |
'Kinematic viscosity' is dimensionally represented as |
| A. | \(\frac{T^2}{L}\) |
| B. | \(\frac{L^2}{T}\) |
| C. | \(\frac{M}{L^2T}\) |
| D. | \(\frac{M}{LT}\) |
| Answer» C. \(\frac{M}{L^2T}\) | |
| 76. |
Kinematic viscosity of gases on increase of temperature |
| A. | Decreases |
| B. | Increases |
| C. | Remains the same |
| D. | First decreases then increases |
| Answer» C. Remains the same | |
| 77. |
A moving fluid mass may be brought to a static equilibrium position by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called |
| A. | Pascal’s law |
| B. | Archimedes’ principle |
| C. | D’Alembert’s principle |
| D. | None of these |
| Answer» D. None of these | |
| 78. |
According to Newton’s law of viscosity, shear stress is: |
| A. | directly proportional to the velocity |
| B. | inversely proportional to the velocity |
| C. | directly proportional to the velocity gradient |
| D. | directly proportional to viscosity |
| Answer» D. directly proportional to viscosity | |
| 79. |
One poise is equivalent to: |
| A. | 1 kg/m-hr |
| B. | 1 gm/cm-sec |
| C. | 98 dyne/sec |
| D. | 68 kgf-sec/m2 |
| Answer» C. 98 dyne/sec | |
| 80. |
Floating logs of wood tend to move to thy' mid-river reach on the water surface. This is due to |
| A. | Least obstruction from the banks |
| B. | 2-cell transverse circulation in the flow |
| C. | Fastest velocity along the mid-river reach |
| D. | Near-symmetry of the isovels across the section is conducive to principle of least work |
| Answer» C. Fastest velocity along the mid-river reach | |
| 81. |
Pick the correct statement about the bulk modulus of elasticity: |
| A. | it is a dimensionless number |
| B. | it is independent of pressure and viscosity |
| C. | it is larger if fluid is more compressible |
| D. | it is higher if the fluid is less compressible |
| Answer» E. | |
| 82. |
Bulk modulus of elasticity. |
| A. | is independent of temperature |
| B. | increases with pressure |
| C. | is independent of pressure and viscosity |
| D. | is larger when fluid is more compressible |
| Answer» C. is independent of pressure and viscosity | |
| 83. |
A fluid whose shear stress is linearly proportional to the velocity gradient in the direction perpendicular to the plane of shear is called as _______. |
| A. | Friction fluid |
| B. | Stress fluid |
| C. | Newtonian fluid |
| D. | Cartesian fluid |
| Answer» D. Cartesian fluid | |
| 84. |
_________ is NOT a property of fluid. |
| A. | Specific weight |
| B. | Area |
| C. | Specific volume |
| D. | Mass density |
| Answer» C. Specific volume | |
| 85. |
In a Newtonian fluid, the shear stress |
| A. | is inversely proportional to the strain |
| B. | is directly proportional to rate of shear strain |
| C. | balances pressure |
| D. | balances inertia stress |
| Answer» C. balances pressure | |
| 86. |
A liquid compressed in a cylinder has a volume of 0.04 m3 at 100 kg/cm2 and a volume of 0.039 m3 at 200 kg/cm2. The bulk modulus of elasticity of liquid is |
| A. | 4000 kg/cm2 |
| B. | 400 kg/cm2 |
| C. | 40 × 105 kg/cm2 |
| D. | 40 × 106 kg/cm2 |
| Answer» B. 400 kg/cm2 | |
| 87. |
If the specific gravity of oil is 0.7, then its density in kg/m3 will be ______ |
| A. | 70 |
| B. | 700 |
| C. | 7 |
| D. | 7000 |
| Answer» C. 7 | |
| 88. |
An iceberg floats in sea water with 14% of its volume projecting above the sea surface. If the specific weight of sea water is 10400 N/m3, determine the specific weight of the iceberg (in N/m3 units). |
| A. | 9125 |
| B. | 8836 |
| C. | 8314 |
| D. | 8944 |
| Answer» E. | |