MCQOPTIONS
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MCQOPTIONS
This section includes 143 Mcqs, each offering curated multiple-choice questions to sharpen your Concrete Technology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The average permeability of soil deposits depends on __________ |
| A. | Direction of flow |
| B. | Coefficient of permeability |
| C. | Moisture content |
| D. | Saturation of the soil |
| Answer» B. Coefficient of permeability | |
| 52. |
The specimen in permeameter is compacted dynamically using___________ |
| A. | DRT |
| B. | Split collar |
| C. | Rod temper |
| D. | Core cutter |
| Answer» D. Core cutter | |
| 53. |
In falling head permeability test apparatus, the water head at any time instant is equal to ____________ |
| A. | Difference in the water level |
| B. | Cross-sectional area of pipe |
| C. | Height of permeameter |
| D. | None of the mentioned |
| Answer» C. Height of permeameter | |
| 54. |
What is the approximate value, which can be taken as void ratio occupied by adsorbed water? |
| A. | 1 |
| B. | 0 |
| C. | 0.1 |
| D. | 10 |
| Answer» D. 10 | |
| 55. |
The average velocity of the tube of area a is given by _________ |
| A. | \(v_{av}=\frac{iγ_w}{8ηπ}a \) |
| B. | \(v_{av}=\frac{\frac{iγ_w}{8ηπ}}{a}\) |
| C. | \(v_{av}=\frac{iγ_w}{2ηπ}a\) |
| D. | \(v_{av}=\frac{\frac{iγ_w}{4ηπ}}{a}\) |
| Answer» B. \(v_{av}=\frac{\frac{iγ_w}{8ηπ}}{a}\) | |
| 56. |
The hydraulic radius RH of circular tube is given by ________ |
| A. | RH=R/4 |
| B. | RH=R/6 |
| C. | RH=R/2 |
| D. | RH=R/12 |
| Answer» D. RH=R/12 | |
| 57. |
Darcy’s law is valid for only ___________ |
| A. | Laminar flow |
| B. | Turbulent flow |
| C. | Hydraulic flow |
| D. | All of the mentioned |
| Answer» B. Turbulent flow | |
| 58. |
Coefficient of permeability or simple permeability is expressed in terms of ____________ |
| A. | cm/sec |
| B. | m/day |
| C. | feet/day |
| D. | all of the mentioned |
| Answer» E. | |
| 59. |
Stiff clays are ______________ permeable. |
| A. | Highly |
| B. | Least |
| C. | Partially |
| D. | None of the mentioned |
| Answer» C. Partially | |
| 60. |
Which of the following factors affects the permeability of soil? |
| A. | Grain size |
| B. | Properties of pore fluid |
| C. | Void ratio of soils |
| D. | All of the mentioned |
| Answer» E. | |
| 61. |
For Darcy’s law to be valid, the Reynolds number should be ________ |
| A. | greater than one |
| B. | less than one |
| C. | equal to one |
| D. | greater than five |
| Answer» C. equal to one | |
| 62. |
The quantity of water flowing in thin cylindrical sheet of thickness dr is ____________ |
| A. | \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\) |
| B. | \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\) |
| C. | \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)8πrdr\) |
| D. | \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)12πrdr\) |
| Answer» B. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\) | |
| 63. |
The co-efficient of permeability of fine sand is ____________ |
| A. | 1.0 and greater |
| B. | 1×10¯⁶ and smaller |
| C. | 1×10¯² to 5×10¯³ |
| D. | 5×10¯² to 1×10¯³ |
| Answer» E. | |
| 64. |
Which of the following permeability test, can be done in Jodhpur permeameter? |
| A. | Falling head test and Constant head test |
| B. | Pumping-out test |
| C. | None of the mentioned |
| D. | All of the mentioned |
| Answer» B. Pumping-out test | |
| 65. |
Darcy’s law in some cases is not valid in ______ |
| A. | clay |
| B. | silt |
| C. | fine sand |
| D. | coarse-gravel |
| Answer» E. | |
| 66. |
The relation between discharge velocity and seepage velocity is ________ |
| A. | Vₛ=Ve |
| B. | Vₛ=Vn |
| C. | Vₛ=V/e |
| D. | Vₛ=V/n |
| Answer» E. | |
| 67. |
The total quantity of water flowing through the capillary tube is given by _________ |
| A. | \(q=\frac{hγ_w}{4ηL} R^2 \) |
| B. | \(q=\frac{hγ_w}{4ηL} R^4\) |
| C. | \(q=\frac{hγ_w}{8ηL} R^2\) |
| D. | \(q=\frac{hγ_w}{8ηL} πR^4\) |
| Answer» E. | |
| 68. |
The degree of saturation in capillarity-permeability test can be found out by ___________ |
| A. | Known dry mass of soil |
| B. | Taking wet mass of soil |
| C. | Finding the porosity |
| D. | All of the mentioned |
| Answer» C. Finding the porosity | |
| 69. |
Loudon’s experiments demonstrated the relationship between _____________ |
| A. | Permeability and specific surface |
| B. | Permeability and grain size |
| C. | Permeability and adsorbed water |
| D. | Permeability and volume |
| Answer» B. Permeability and grain size | |
| 70. |
If the soil has discharge velocity is 9*10¯⁷cm/s and the voids ratio of 0.5, then the seepage velocity will be _______ |
| A. | 18*10¯⁷cm/s |
| B. | 27*10¯⁷cm/s |
| C. | 16*10¯⁷cm/s |
| D. | 13*10¯⁷cm/s |
| Answer» C. 16*10¯⁷cm/s | |
| 71. |
The coefficient of permeability of clean gravel is _________ |
| A. | 1*10¯⁶ and smaller |
| B. | 5*10¯⁴ – 1*10¯⁵ |
| C. | 1 – 1*10¯² |
| D. | 1 and greater |
| Answer» E. | |
| 72. |
The velocity of flow is proportional to _________ according to Darcy’s law. |
| A. | effective stress |
| B. | hydraulic gradient |
| C. | cohesion |
| D. | adhesion |
| Answer» C. cohesion | |
| 73. |
The coefficient of permeability of the two soil layers 1 and 2 in soil deposit is 9*10¯⁷ cm/s and 4*10¯⁷ cm/s respectively. The thickness of the layers is equal. The value of average permeability perpendicular to bedding planes is ________ |
| A. | 4.5*10¯⁷ cm/s |
| B. | 5.5*10¯⁷ cm/s |
| C. | 6.5*10¯⁷ cm/s |
| D. | 7.5*10¯⁷ cm/s |
| Answer» C. 6.5*10¯⁷ cm/s | |
| 74. |
What will be its average permeability perpendicular to the bedding plane if a soil deposit has three layers of soil? The permeability of the second layer is 1/2 that of the first layer and the permeability of the third layer is 1/3 that of the first layer. The thickness of each layer is equal. |
| A. | k |
| B. | 1/2k |
| C. | 1/3k |
| D. | 1/4k |
| Answer» C. 1/3k | |
| 75. |
The coefficient of permeability of the two soil layers 1 and 2 in soil deposit is 9*10¯⁷ cm/s and 4*10¯⁷ cm/s respectively. The thickness of the layers is equal. The value of average permeability parallel to bedding planes is ________ |
| A. | 4.5*10¯⁷ cm/s |
| B. | 5.5*10¯⁷ cm/s |
| C. | 6.5*10¯⁷ cm/s |
| D. | 7.5*10¯⁷ cm/s |
| Answer» D. 7.5*10¯⁷ cm/s | |
| 76. |
Darcy’s law of linear dependency is valid for only _______ flow conditions in soil. |
| A. | laminar and turbulent |
| B. | laminar |
| C. | turbulent |
| D. | intermediate |
| Answer» B. laminar | |
| 77. |
The coefficient of permeability is equal to velocity of flow when _________ |
| A. | hydraulic gradient is equal to one |
| B. | hydraulic gradient is less than one |
| C. | hydraulic gradient is greater than one |
| D. | hydraulic gradient is equal to zero |
| Answer» B. hydraulic gradient is less than one | |
| 78. |
The relationship between coefficient of permeability and coefficient of percolation is ______ |
| A. | kₚ=kn |
| B. | kₚ=ke |
| C. | kₚ=k/e |
| D. | kₚ=k/n |
| Answer» E. | |
| 79. |
If the discharge velocity is 4*10¯⁷cm/s and the porosity is 33%, then the seepage velocity will be _______ |
| A. | 18*10¯⁷cm/s |
| B. | 12*10¯⁷cm/s |
| C. | 6*10¯⁷cm/s |
| D. | 3*10¯⁷cm/s |
| Answer» C. 6*10¯⁷cm/s | |
| 80. |
Allen Hazen’s formula is given by which of the following equations? |
| A. | K = 100m2 |
| B. | K = C D102 |
| C. | K = 200De2e2 |
| D. | None of the mentioned |
| Answer» C. K = 200De2e2 | |
| 81. |
The total quantity of water with respect to the hydraulic gradient flowing through the capillary tube is given by _________ |
| A. | \( q=\frac{hiγ_w}{4ηL} R^2 \) |
| B. | \( q=\frac{hγ_w}{4ηL} R^4/i\) |
| C. | \( q=\frac{iγ_w}{8η} π R^2\) |
| D. | \( q=\frac{iγ_w}{8η} πR^4\) |
| Answer» E. | |
| 82. |
The relationship between the quantity of flow with respect to the hydraulic radius and the voids ratio is given by ________ |
| A. | \(q=\frac{γ_w R_H^2}{η}\frac{e}{1+e}iA\) |
| B. | \(q=C_S\frac{γ_w R_H^2}{η}\frac{e}{1+e}\) |
| C. | \(q=C_S\frac{γ_w R_H^2}{η}iA\) |
| D. | \(q=C_S\frac{γ_w R_H^2}{η}\frac{e}{1+e}iA\) |
| Answer» E. | |
| 83. |
The average coefficient of permeability of whole deposit will depend upon _________ |
| A. | direction of flow with respect to bedding plane |
| B. | direction of flow but not with respect to the bedding plane |
| C. | length of the bedding plane |
| D. | width of the bedding plane |
| Answer» B. direction of flow but not with respect to the bedding plane | |
| 84. |
The study of seepage of water through soil is important for, which of the following purpose? |
| A. | Drainage of soils |
| B. | Stability of slopes |
| C. | Ground water flow towards well |
| D. | All of the mentioned |
| Answer» E. | |
| 85. |
The drainage property of silty clay is ________ |
| A. | very good |
| B. | good |
| C. | fair |
| D. | very poor |
| Answer» E. | |
| 86. |
Which of the following tubes are used in the constant head test? |
| A. | Inlet tube |
| B. | Overflow tube |
| C. | Outlet tube |
| D. | All of the mentioned |
| Answer» E. | |
| 87. |
Darcy’s law is valid as long as it is equal to or less than ____________ |
| A. | 1 |
| B. | 0 |
| C. | 0.1 |
| D. | 2 |
| Answer» B. 0 | |
| 88. |
Falling head permeability test can be used for ___________ |
| A. | Coarse-grained soil |
| B. | Less permeable soil |
| C. | Clayey soil |
| D. | All of the mentioned |
| Answer» C. Clayey soil | |
| 89. |
Which of the following formula is used in Falling head permeability test? |
| A. | Jacky’s formula |
| B. | Louden’s formula |
| C. | Darcy’s law |
| D. | Kozney’s formula |
| Answer» D. Kozney’s formula | |
| 90. |
The critical Reynolds number varies from ________ for validity of Darcy’s law. |
| A. | 0.1-75 |
| B. | 75-100 |
| C. | 100-175 |
| D. | 175-200 |
| Answer» B. 75-100 | |
| 91. |
The average permeability perpendicular to the bedding planes is given by________ |
| A. | \(k = \frac{k_1 z_1+k_2 z_2+⋯.+k_n z_n}{z}*\frac{1}{2} \) |
| B. | \(k = \frac{1}{\frac{z_1}{k_1} +\frac{z_2}{k_2} +⋯+\frac{z_n}{k_n}} \) |
| C. | \(k = \frac{z}{\frac{z_1}{k_1} +\frac{z_2}{k_2} +⋯+\frac{z_n}{k_n}} \) |
| D. | \(k = \frac{k_1 z_1+k_2 z_2+⋯.+k_n z_n}{z} \) |
| Answer» D. \(k = \frac{k_1 z_1+k_2 z_2+⋯.+k_n z_n}{z} \) | |
| 92. |
K = 100Dm2, is given by which of the following formula? |
| A. | Terzaghi’s formula |
| B. | Kozney’s formula |
| C. | Jacky’s formula |
| D. | Allen Hazen’s formula |
| Answer» D. Allen Hazen’s formula | |
| 93. |
What is the effect of adsorbed water on the permeability of soil? |
| A. | Structural arrangement is varied |
| B. | Reduced degree of saturation |
| C. | Size of the particles is diminished |
| D. | Reduces the pore size |
| Answer» E. | |
| 94. |
The bedding planes of soil layers in soil mass may be __________ |
| A. | Horizontal |
| B. | Vertical |
| C. | Inclined |
| D. | All of the mentioned |
| Answer» E. | |
| 95. |
The hydraulic radius RH is the ratio of the area of the tube to its volume. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 96. |
In the definition of the seepage velocity, the cross-sectional area of the voids is taken as _______ to the direction of flow. |
| A. | parallel |
| B. | opposite |
| C. | perpendicular |
| D. | tangential |
| Answer» D. tangential | |
| 97. |
Which of the following formula, cannot be used for determining the permeability of soil? |
| A. | Jacky’s formula |
| B. | Allen Hazen’s formula |
| C. | Kozney’s formula |
| D. | Darcy’s formula |
| Answer» E. | |
| 98. |
Permeability can be determined by direct measurement with the help of ___________ |
| A. | Permeameter |
| B. | Consolidation test |
| C. | Horizontal capillary test |
| D. | Pumping-out test |
| Answer» B. Consolidation test | |
| 99. |
The linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil _______ |
| A. | does not exceed 3mm |
| B. | exceeds 3mm |
| C. | equal to 3mm |
| D. | equal to 5mm |
| Answer» B. exceeds 3mm | |
| 100. |
The Jodhpur permeameter apparatus is, meant for studying _________ |
| A. | Permeability characteristics |
| B. | Coefficient of permeability |
| C. | Capillary rise |
| D. | All of the mentioned |
| Answer» B. Coefficient of permeability | |