MCQOPTIONS
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MCQOPTIONS
This section includes 110 Mcqs, each offering curated multiple-choice questions to sharpen your Soil Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The seepage loss (in m per day per unit length of the wall) of water is |
| A. | 0.33 |
| B. | 0.38 |
| C. | 0.43 |
| D. | 0.54 |
| Answer» C. 0.43 | |
| 52. |
The initial void ratio of the clay layer is |
| A. | 0.209 |
| B. | 0.563 |
| C. | 0.764 |
| D. | 1.00 |
| Answer» C. 0.764 | |
| 53. |
Compaction by vibratory roller is the best method of compaction is case of |
| A. | moist silty sand |
| B. | well graded dry sand |
| C. | clay of medium comprehensibility |
| D. | silt of high comprehensibility |
| Answer» C. clay of medium comprehensibility | |
| 54. |
What is the change in the effective stress in kN/m |
| A. | 0 |
| B. | 20 |
| C. | 80 |
| D. | 100 |
| Answer» E. | |
| 55. |
What would be the effective stress (rounded off to the nearest integer value of kPa) at 30 m depth into the sand layer? |
| A. | 77 kPa |
| B. | 273 kPa |
| C. | 268 kPa |
| D. | 281 kPa |
| Answer» E. | |
| 56. |
The factor of safety against the occurrence of piping failure is |
| A. | 3.55 |
| B. | 2.93 |
| C. | 2.60 |
| D. | 0.39 |
| Answer» D. 0.39 | |
| 57. |
An infinitely long slope is made up of a c- soil having the properties: cohesion (c) = 20 kPa, and dry unit weight ( |
| A. | 21 to 23 |
| B. | 31 to 33 |
| C. | 41 to 43 |
| D. | 11 to 13 |
| Answer» B. 31 to 33 | |
| 58. |
The ratio N |
| A. | upstream and downstream heads are interchanged |
| B. | soil in the flow space is changed |
| C. | dimensions of the flow space are changed |
| D. | head difference causing the flow is changed |
| Answer» D. head difference causing the flow is changed | |
| 59. |
The following statements were made on a compacted soil, where DS stands for soil compaction on dry side of OMC, and WS stands for soil compaction on wet side of OMC. Identify the incorrect statement. |
| A. | Soil structure is floculated on DS and dispersed on WS. |
| B. | Construction of pore water pressure is low on DS and high on DS |
| C. | Soil is drying, shrinkage is high on DS and low on WS |
| D. | On addition of water, swelling is high on DS and low on WS. |
| Answer» E. | |
| 60. |
A non-homogeneous soil deposit consists of a silt layer sandwiched between a fine-sand layer at top and a clay layer below. |
| A. | 11.0254 |
| B. | 10.9675 |
| C. | 10.0056 |
| D. | 9.6542 |
| Answer» C. 10.0056 | |
| 61. |
In a compaction test, G, w, S and e represent the specific gravity, water content, degree of saturation and void ratio of the soil sample, respectively. If |
| A. | <table><tr><td rowspan="2"> <sub>d</sub> =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G <sub>w</sub></center></td><td rowspan="2"></td></tr><td align="center">1 + Se</td></table> |
| B. | <table><tr><td rowspan="2"> <sub>d</sub> =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G <sub>w</sub></center></td><td rowspan="2"></td></tr><td align="center">1 + GW</td></table> |
| C. | <table><tr><td rowspan="2"> <sub>d</sub> =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G <sub>w</sub></center></td><td rowspan="2"></td></tr><td align="center">e + <sub>w</sub>S</td></table> |
| D. | <table><tr><td rowspan="2"> <sub>d</sub> =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>GW</center></td><td rowspan="2"></td></tr><td align="center">1 + Se</td></table> |
| Answer» C. <table><tr><td rowspan="2"> <sub>d</sub> =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G <sub>w</sub></center></td><td rowspan="2"></td></tr><td align="center">e + <sub>w</sub>S</td></table> | |
| 62. |
Two series of compaction tests were performed in the laboratory on an inorganic clayey soil employing two different levels of compaction energy per unit volume of soil. With regard to the above tests, the following two statements are made. |
| A. | Only I is TRUE |
| B. | Only II is TRUE |
| C. | Both I and II are TRUE |
| D. | Neither I nor II is TRUE |
| Answer» C. Both I and II are TRUE | |
| 63. |
A 588 cm |
| A. | 0.21 |
| B. | 0.51 |
| C. | 0.71 |
| D. | 0.91 |
| Answer» D. 0.91 | |
| 64. |
A 4 m thick layer of normally consolidated clay has an average void ratio of 1.30. Its compression index is 0.6 and coefficient of consolidation is 1 m |
| A. | 316 mm |
| B. | 315 mm |
| C. | 314 mm |
| D. | 312 mm |
| Answer» D. 312 mm | |
| 65. |
Deposit with flocculated structure is formed when |
| A. | Clay particles settle on sea bed |
| B. | Clay particles settle on fresh water lake bed |
| C. | Sand particles settle on river bed |
| D. | Sand particles settle on sea bed |
| Answer» C. Sand particles settle on river bed | |
| 66. |
A clayey soil has a maximum dry density fo 16 kN/m |
| A. | the density is less than the maximum dry density and water content is on dry side of optimum. |
| B. | the compaction density is very low and water content is less than 12%. |
| C. | the compaction is done on the dry side of the optimum. |
| D. | both the dry density and water content of the compacted soil are within the desirable limits. |
| Answer» E. | |
| 67. |
In an untrained triaxial test on a saturated clay, the Poisson s ratio is |
| A. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sub>3</sub></center></td></tr><td align="center">( <sub>1</sub> + <sub>3</sub>)</td></table> |
| B. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sub>3</sub></center></td></tr><td align="center">( <sub>1</sub> - <sub>3</sub>)</td></table> |
| C. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sub>1</sub> - <sub>3</sub></center></td></tr><td align="center"> <sub>3</sub></td></table> |
| D. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sub>1</sub> + <sub>3</sub></center></td></tr><td align="center"> <sub>3</sub></td></table> |
| Answer» B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <sub>3</sub></center></td></tr><td align="center">( <sub>1</sub> - <sub>3</sub>)</td></table> | |
| 68. |
Identify the two FALSE statements from the following four statements. |
| A. | II & III |
| B. | I & IV |
| C. | I & III |
| D. | II & IV |
| Answer» C. I & III | |
| 69. |
The coefficients of permeability of a soil in horizontal and vertical directions are 3.46 and 1.5 m/day respectively. The base length of a concrete dam resting in this soil is 100 m. When the flow net is developed for this soil with 1:25 scale factor in the vertical direction, the reduced base length of the dam will be |
| A. | 2.63 m |
| B. | 4.00 m |
| C. | 6.08 m |
| D. | 5.43 m |
| Answer» B. 4.00 m | |
| 70. |
A soil sample has a void ratio of 0.5 and its porsity will be close to |
| A. | 50% |
| B. | 66% |
| C. | 100% |
| D. | 33% |
| Answer» E. | |
| 71. |
If the water content of a fully saturated soil mass is 100%, the void ratio of the sample is |
| A. | less than specific gravity of soil |
| B. | equal to specific gravity of soil |
| C. | greater than specific gravity of soil |
| D. | independent of specific gravity of soil |
| Answer» C. greater than specific gravity of soil | |
| 72. |
Data from a sieve analysis conducted on a given sample of soil showed that 67% of the particles passed through 75 micron IS sieve. The liquid limit and plastic limit of the finer fraction was found to be 45 and 33 percents respectively. The group symbol of the given soil as per IS:1498-1970 is |
| A. | SC |
| B. | MI |
| C. | CH |
| D. | MH |
| Answer» C. CH | |
| 73. |
The clay mineral primarily governing the swelling behaviour of Black Cotton soil is |
| A. | Halloysite |
| B. | Illite |
| C. | Kaolinite |
| D. | Montmorillonite |
| Answer» E. | |
| 74. |
The void ratio and specific gravity of a soil are 0.65 and 2.72 respectively. The degree of saturation (in percent) corresponding to water content of 20% is |
| A. | 65.3 |
| B. | 20.9 |
| C. | 83.7 |
| D. | 54.4 |
| Answer» D. 54.4 | |
| 75. |
In a drained triaxial compression test, a saturated specimen of a cohesion less sand fails under a deviatoric stress of 3 kg/cm |
| A. | 37 |
| B. | 45 |
| C. | 53 |
| D. | 20 |
| Answer» B. 45 | |
| 76. |
A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m |
| A. | 0.80 |
| B. | 1.1 |
| C. | 1.25 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 77. |
A double draining clay layer, 6 m thick, settles by 30 mm in three years under the influence of a certain loads. Its final consolidation settlement has been estimated to be 120 mm. If a thin layer of sand having negligible thickness is introduced at a depth of 1.5 m below the top surface, the final consolidation settlement of clay layer will be |
| A. | 60 mm |
| B. | 120 mm |
| C. | 240 mm |
| D. | None of these |
| Answer» C. 240 mm | |
| 78. |
A masonry dam is founded on previous sand having porosity equal to 45% and specific gravity of sand particles is 2.65. For a desired factor of safety of 3 against sand boiling, the maximum permissible upward gradient will be |
| A. | 0.225 |
| B. | 0.302 |
| C. | 1.0 |
| D. | None of these |
| Answer» C. 1.0 | |
| 79. |
In a triaxial test carried, out on a cohesion less soil sample with a cell pressure of 20 kPa, the observed value of applied stress at the point of failure was 40 kPa. The angle of internal friction of the soil is |
| A. | 10 |
| B. | 15 |
| C. | 25 |
| D. | 30 |
| Answer» E. | |
| 80. |
The time for a clay layer to achieve 85% consolidation is 10 years. If the layer was half as thick, 10 times more permeable and 4 times more compressible then the time that would be required to achieve the same degree of sonsolidation is |
| A. | 1 year |
| B. | 5 years |
| C. | 12 years |
| D. | 16 years |
| Answer» B. 5 years | |
| 81. |
A 6 m thick clay layer undergoes 90% consolidation four times faster under two-way drainage as compared to the - drainage. In an identical clay layer of 15 m thickness, two way drainage will be faster as compared to one-way drainage by |
| A. | 8 times |
| B. | 4 times |
| C. | 2.5 times |
| D. | 2 times |
| Answer» C. 2.5 times | |
| 82. |
A unit volume of a mass of saturated soil is subjected to horizontal seepage. The saturated unit weight is 22 kN/m |
| A. | 1.98 kN |
| B. | 6.6 kN |
| C. | 11.49 kN |
| D. | 22.97 kN |
| Answer» E. | |
| 83. |
The ratio of saturated unit weight to dry unit weight of dry unit weight is 1.25. If the specific gravity of solids (Gs) is 2.56, the void ratio of the soil is |
| A. | 0.625 |
| B. | 0.663 |
| C. | 0.944 |
| D. | 1.325 |
| Answer» C. 0.944 | |
| 84. |
A braced cut, 5 m wide and 7.5 m deep is proposed in a cohesion less soil deposit having effective cohesion c = 0 and effective friction angle, = 36 . The first row of struts is to be installed a depth of 0.5 m below ground surface and spacing between the struts should be 1.5 m. If the horizontal spacing of struts is 3 m and unit weight of the deposit is 20kN/m |
| A. | 70.87 kN |
| B. | 98.72 kN |
| C. | 113.90 kN |
| D. | 151.86 kN |
| Answer» D. 151.86 kN | |
| 85. |
Two soil specimens with identical geometric dimensions were subjected to falling head permeability tests in the laboratory under identical conditions. The fall of water head was measured after an identical time interval. The ratio of initial to final water heads for the test involving the first specimen was 1.25. If the coefficient of permeability of the second specimen is 5-times that of the first, the ratio of initial to final water heads in the test involving the second specimen is |
| A. | 3.05 |
| B. | 3.80 |
| C. | 4.00 |
| D. | 6.25 |
| Answer» B. 3.80 | |
| 86. |
An open ended steel barrel of 1 m height and 1 m diameter is filled with saturated fine sand having coefficient of permeability of 10 |
| A. | 58.9 s |
| B. | 75 s |
| C. | 100 s |
| D. | 150 s |
| Answer» C. 100 s | |
| 87. |
As per the Indian Standard soil classification system, a sample of silty clay with liquid limit of 40% and plasticity index of 28% is classified as |
| A. | CH |
| B. | CI |
| C. | CL |
| D. | CL-ML |
| Answer» C. CL | |
| 88. |
The laboratory test results of a soil sample are given below: |
| A. | GM |
| B. | SM |
| C. | GC |
| D. | ML-MI |
| Answer» C. GC | |
| 89. |
If the effective stress strength parameters of a soil are c = 10kPa and = 30 , the shear strength on a plane within the saturated soil mass at a point where the total normal stress is 300kPa and pore water pressure is 150 kPa will be |
| A. | 90.5 kPa |
| B. | 96.6 kPa |
| C. | 101.5 kPa |
| D. | 105.5 kPa |
| Answer» C. 101.5 kPa | |
| 90. |
A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represented by the letter symbols |
| A. | CL |
| B. | CI |
| C. | CH |
| D. | CL-ML |
| Answer» D. CL-ML | |
| 91. |
An infinite slope is to be constructed in a soil. The effective stress strength parameters of the soil are c = 0 and = 30 . The saturated unit weight of the slope is 20kN/m |
| A. | 10.89 |
| B. | 11.30 |
| C. | 12.48 |
| D. | 14.73 |
| Answer» B. 11.30 | |
| 92. |
The specific gravity and insitu void ratio of a soil deposit are 2.71 and 0.85 respectively. The value of the critical hydraulic gradient is |
| A. | 0.82 |
| B. | 0.85 |
| C. | 0.92 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 93. |
For a triaxial shear test conducted on a sand specimen at a confining pressure of 100 kN/m |
| A. | 18.43 |
| B. | 19.47 |
| C. | 26.56 |
| D. | 30 |
| Answer» C. 26.56 | |
| 94. |
A soil is composed of solid spherical grains of identical specific gravity and diameter between 0.075 mm and 0.0075 mm. If the terminal velocity of the largest particle falling through water without flocculation is 0.5 mm/s, that for the smallest particle would be |
| A. | 0.005 mm/s |
| B. | 0.05 mm/s |
| C. | 5 mm/s |
| D. | 50 mm/s |
| Answer» B. 0.05 mm/s | |
| 95. |
In its natural condition a soil sample has a mass of 1.980 kg and a volume of 0.001 m |
| A. | 0.65 |
| B. | 0.7 |
| C. | 0.54 |
| D. | 0.61 |
| Answer» D. 0.61 | |
| 96. |
The water content of a saturated soil and the specific gravity of soil solids were found to be 30% and 2.70, respectively, Assuming the unit weight of water to be 10 kN/m |
| A. | 19.4, 0.81 |
| B. | 18.5, 0.30 |
| C. | 19.4, 0.45 |
| D. | 18.5,0.45 |
| Answer» B. 18.5, 0.30 | |
| 97. |
Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g and 270 g of soil pass through 4.75 mm and 0.075 mm sieve, respectively. The liquid limit and plastic limits of the soil fraction passing through 425 m sieves are 40% and 18% respectively. The soil may be classified as |
| A. | SC |
| B. | MI |
| C. | CI |
| D. | SM |
| Answer» B. MI | |
| 98. |
Thej following data were obtained from a liquid limit test conducted on a soil sample |
| A. | 63.1% |
| B. | 62.8% |
| C. | 61.9% |
| D. | 60.6% |
| Answer» D. 60.6% | |
| 99. |
The avoid ratios at the densest, loosest and the natural states of a sand deposit are 0.2, 0.6 and 0.4, respectively, the relative density of the deposit is |
| A. | 100% |
| B. | 75% |
| C. | 50% |
| D. | 25% |
| Answer» D. 25% | |
| 100. |
In a constant head permeameter with cross section of 10 cm |
| A. | 0.002 cm/s |
| B. | 0.02 cm/s |
| C. | 0.2 cm/s |
| D. | 2.0 cm/s |
| Answer» E. | |