Geography

Soil and Foundation Engineering

584 Questions

Soil and foundation engineering questions address the physical and mechanical properties of soil critical for construction and stability. The topics include shear strength, soil compaction, void ratios, and subsurface investigation techniques. These advanced geotechnical concepts are typically evaluated in civil engineering and specialized recruitment examinations.

Soil compactionShear strengthBearing capacityVoid ratio analysisSubsurface exploration

Soil and Foundation Engineering Questions

Multiple choice

Dilatancy correction is required when a strata is

  1. cohesive and saturated and also has N value of SPT > 15

  2. saturated silt/fine sand and N value of SPT < 10 after the overburden correction

  3. saturated silt/fine sand and N value of SPT >15 after the overburden correction

  4. coarse sand under dry condition and N value of SPT < 10 after the overburden correction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Dilatancy correction is also known as correction due to submergence of the soil and applied for the silt and fine sand is given as $$N_c = 15 + \frac{1}{5}(N_0 - 15)$$

Where, $N_0 = $ value of SPT after correction applied due to overburden pressure.

Multiple choice

A plate load test is carried out on a 300 mm x 300 mm plate placed at 2 m below the ground level to determine the bearing capacity of a 2 m x 2 m footing placed at same depth of 2 m on a homogeneous sand deposit extending 10 m below ground. The ground water table is 3 m below the ground level. Which of the following factors does not require a correction to the bearing capacity determined based on the load test?

  1. Absence of the overburden pressure during the test

  2. Size of the plate is much smaller than the footing size

  3. Influence of the ground water table

  4. Settlement is recorded only over a limited period of one or two days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 

Multiple choice

An agricultural land of 437 ha is to be irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm. If a rainfall of 15 cm occurs during the base period, the duty of irrigation water is

  1. 437 ha/cumec

  2. 486 ha/cumec

  3. 741 ha/cumec

  4. 864 ha/cumec
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Duty is defined as the area irrigated per unit discharge. Net water required = 105 cm - 15 cm = 90 cm = 0.9 m. Total volume = 437 ha * 0.9 m = 393.3 ha-m. Base period = 90 days = 90 * 24 * 3600 seconds. Discharge = Volume / Time = (393.3 * 10000 m^3) / (90 * 86400 s) = 0.5057 cumec. Duty = 437 / 0.5057 = 864 ha/cumec.

Multiple choice

In a sand casting operation, the total liquid head is maintained constant such that it is equal to the mould height. The time taken to fill the mould with a top gate is tA. If the same mould is filed with a bottom gate, then the time taken is tB. Ignore the time required to fill the runner and frictional effects. Assume atmospheric pressure at the top molten metal surfaces. The relation between and tA tB is
  1. tB = $\sqrt{2}$tA

  2. tB = 2 tA
  3. tB = $\frac{t_A}{\sqrt{2}}$tA
  4. tB = 2$\sqrt{2}$tA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Multiple choice

Figure given below shows a smooth vertical gravity retaining wall with cohesionless soil backfill having an angle of internal friction $\phi$ In the graphical representation of Rankine’s active earth pressure for the retaining wall shown in figure, length OP represents

  1. vertical stress at the base

  2. vertical stress at a height H/3 from the base

  3. lateral earth pressure at the base

  4. lateral earth pressure at a height H/3 from the base
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Rankine's active earth pressure method is graphical method to determine the active earth pressure of the soil.OP dose not cut the mohr;s circle tangential, so OP represents the vertical stress at the base.