MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A uniform collapsible sand stratum, 2.5 m thick, has specific gravity of its sand as 2.65, with a natural void ratio of 0.65. The hydraulic head required to cause quick collapsible sand condition is |
| A. | 2.50 m |
| B. | 2.75 m |
| C. | 3.25 m |
| D. | 3.50 m |
| Answer» B. 2.75 m | |
| 2. |
A stratum of 3.5 m thick fine sand has a void ratio of 0.7 and G of 2.7. For a quicksand condition to develop in this strata, the water flowing in an upward direction would require a head of: |
| A. | 7 m |
| B. | 5.56 m |
| C. | 5 m |
| D. | 3.5 m |
| Answer» E. | |
| 3. |
A company has proposed to design a weir across a river in alluvial soil. The piezometric head at the bottom of the datum is computed as 10 m. The datum is 3 m below the floor bottom. The assured standing water depth above the floor is 2 m. The specific gravity of the floor material is 2.5. The required minimum thickness of the floor is: |
| A. | 4.2 m |
| B. | 2 m |
| C. | 3.3 m |
| D. | 1.5 m |
| Answer» C. 3.3 m | |
| 4. |
Consider the following statements in the context of capillary pressure in soils:1. Pore water pressure is negative in capillary zone.2. Water is in tension in capillary zone.3. Capillary pressure in more in coarse grained soils.Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 5. |
In a saturated clay layer undergoing consolidation with single drainage at its top, the pore water pressure would be the maximum at its |
| A. | top |
| B. | middle |
| C. | bottom |
| D. | top as well as bottom |
| Answer» D. top as well as bottom | |
| 6. |
A flownet is drawn to obtain |
| A. | seepage, coefficient of permeability and uplift pressure |
| B. | coefficient of permeability, uplift pressure and exit gradient |
| C. | exit gradient, uplift pressure and seepage quantity |
| D. | exit gradient, seepage, and coefficient of permeability |
| Answer» D. exit gradient, seepage, and coefficient of permeability | |
| 7. |
Groundwater flows through an aquifer with cross-sectional and of 1.0 × 104 m2 and a length of 1500 m. Hydraulic heads are 300 m and 250 m at the groundwater entry and exit points in the aquifer, respectively. Groundwater discharges into a stream at the rate of 750 m3/day. Then the hydraulic conductivity of the aquifer is |
| A. | 1.50 m/day |
| B. | 2.25 m/day |
| C. | 3.50 m/day |
| D. | 4.25 m/day |
| Answer» C. 3.50 m/day | |
| 8. |
An Isobar is |
| A. | a structural part of a barrage |
| B. | a line joining points of equal rainfall |
| C. | line of isolation in hydraulic machines |
| D. | a line joining points of equal pressure |
| Answer» E. | |
| 9. |
A 3 m thick soil stratum has 40% porosity. If the unit weight of soil at 12.2% water content is 18 kN/m3 , the total head required to cause quick sand condition is |
| A. | 1.0 m |
| B. | 1.832 m |
| C. | 3.105 m |
| D. | 6.097 m |
| Answer» D. 6.097 m | |
| 10. |
A load of 6251 T is imposed on a footing of size 2 m × 2 m If it is to be assumed that, stress at depth "d" is spread out at an angle of 2 vertical to 1 horizontal, find out the depth 'd' at which the intensity of stress will be \({\left( {\frac{1}{9}} \right)^{th}}\) of the stress at ground level. Choose correct depth in metres from the following: |
| A. | 2 m |
| B. | 3 m |
| C. | 4 m |
| D. | 5 m |
| Answer» D. 5 m | |
| 11. |
If pressure due to submerged weight of the soil is equal to the seepage pressure, the effective pressure: |
| A. | Remains the same |
| B. | Becomes zero |
| C. | Becomes unity |
| D. | Becomes maximum |
| Answer» C. Becomes unity | |
| 12. |
In which one of the following pairs of soil types would you anticipate negative pore pressure when subjected to shearing? |
| A. | Normally consolidated clay and dense sand |
| B. | Overconsolidated clay and loose sand |
| C. | Less consolidated clay and overconsolidated clay |
| D. | Dense sand and overconsolidated clay |
| Answer» E. | |
| 13. |
A flownet below a dam consists of 24 equipotential drops and 7 flow channels. The difference between the upstream and downstream water levels is 6 m. The length of the flow line adjacent to the toe of the dam at exit is 1 m. The specific gravity and void ratio of the soil below the dam are 2.70 and 0.70, respectively. The factor of safety against piping is |
| A. | 1.67 |
| B. | 2.5 |
| C. | 3.4 |
| D. | 4 |
| Answer» E. | |
| 14. |
Consider the following statements:1. Effective stress in a sand layer below a lake with standing water does not alter as the water level fluctuates.2. Regarding water table below the ground surface, any rise in the water table causes equal changes in both pore pressure and effective stress.3. Capillary saturation will cause the effective stress to increase.Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» E. | |
| 15. |
Following diagram is the effective stress distribution diagram for |
| A. | dry soil mass |
| B. | submerged soil mass |
| C. | soil mass under surcharge |
| D. | saturated soil with capillary fringe |
| Answer» C. soil mass under surcharge | |
| 16. |
Consider the following statements:(i) Quicksand is a special variety of sand(ii) Quicksand is not a material but a hydraulic condition.(iii) In nature, quicksand condition is observed usually in coarse silt or fine sand.Which of the above statements are correct? |
| A. | (i), (ii) and (iii) |
| B. | (i) and (ii) |
| C. | (ii) and (iii) |
| D. | (i) and (iii) |
| Answer» D. (i) and (iii) | |
| 17. |
Effective stress on soil |
| A. | Increases voids ratio and decreases permeability |
| B. | Increases both voids ratio and permeability |
| C. | Decreases both voids ratio and permeability |
| D. | Decreases void ratio and increases permeability |
| Answer» D. Decreases void ratio and increases permeability | |
| 18. |
A uniformly distributed line load of 500 kN/m is acting on the ground surface based on Boussinesq’s theory, the ratio of vertical stress at a depth 2 m to that at 4 m right below the limit of loading is |
| A. | 0.25 |
| B. | 0.5 |
| C. | 2.0 |
| D. | 4.0 |
| Answer» D. 4.0 | |
| 19. |
A sand deposit has a porosity of 1/3 and its specific gravity is 2.5. The critical hydraulic gradient to cause sand boiling in the stratum will be |
| A. | 1.5 |
| B. | 1.25 |
| C. | 1.0 |
| D. | 0.75 |
| Answer» D. 0.75 | |