GATE CE Soil Mechanics PYQs & Answers — Page 3

Questions 21–30 of 103. Imported answers require independent review unless marked reviewed.

Consider the statements P and Q.

P: Soil particles formed by mechanical weathering, and close to their origin are generally unrounded.

Q: Activity of the clay physically signifies its swell potential.

Which one of the following options is CORRECT?

Your answerChoose one option.

Both P and Q are TRUE

P is TRUE and Q is FALSE

Both P and Q are FALSE

P is FALSE and Q is TRUE

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Which one of the following saturated fine-grained soils can attain a negative Skempton’s pore pressure coefficient (A)?

Your answerChoose one option.

Quick clays

Normally-consolidated clays

Lightly-consolidated clays

Over-consolidated clays

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An embankment is constructed with soil by maintaining the degree of saturation as 75% during compaction. The specific gravity of soil is 2.68 and the moisture content is 17% during compaction. Consider the unit weight of water as 10 kN/m

. The dry unit weight (in kN/m

) of the compacted soil is ______________ (rounded off to 2 decimal places).

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Consider the statements P, Q, and R.

P: Compacted fine-grained soils with flocculated structure have isotropic permeability.

Q: Phreatic surface/line is the line along which the pore water pressure is always maximum.

R: The piping phenomenon occurring below the dam foundation is typically known as blowout piping.

Which of the following option(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

Both P and R are TRUE

P is FALSE and Q is TRUE

P is TRUE and R is FALSE

Both Q and R are FALSE

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Which of the following statement(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

Swell potential of soil decreases with an increase in the shrinkage limit.

Both loose and dense sands with different initial void ratios can attain similar void ratio at large strain during shear.

Among the several corrections to be applied to the SPT-N value, the dilatancy correction is applied before all other corrections.

In electrical resistivity tomography, the depth of current penetration is half of the spacing between the electrodes.

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The total primary consolidation settlement (

) of a building constructed on a 10 m thick saturated clay layer is estimated to be 50 mm. After 300 days of the construction of the building, primary consolidation settlement was reported as 10 mm. The additional time (in days) required to achieve 50% of

will be ____________________ (rounded off to the nearest integer).

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A homogeneous earth dam has a maximum water head difference of 15 m between the upstream and downstream sides. A flownet was drawn with the number of potential drops as 10 and the average length of the element as 3 m. Specific gravity of the soil is 2.65. For a factor of safety of 2.0 against piping failure, void ratio of the soil is ________ (rounded off to 2 decimal places).

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The in-situ percentage of voids of a sand deposit is 50%. The maximum and minimum densities of sand determined from the laboratory tests are 1.8 g/cm

and 1.3 g/cm

, respectively. Assume the specific gravity of sand as 2.7.

The relative density index of the in-situ sand is __________ (rounded off to 2 decimal places).

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A soil sample was consolidated at a cell pressure of 20 kPa and a back pressure of 10 kPa for 24 hours during a consolidated undrained (CU) trial test. The cell pressure was increased to 30 kPa on the next day and it resulted in the development of pore water pressure of 1 kPa. The soil sample failed when the axial stress was gradually increased to 50 kPa. The pore water pressure at failure was recorded as 21 kPa. The value of Skempton’s pore pressure parameter B for the soil sample is ____________ (rounded off to 2 decimal places).

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A drained triaxial test was conducted on a saturated sand specimen using a stress-path trial testing system. The specimen failed when the axial stress reached a value of 100 kN/m

from an initial confining pressure of 300 kN/m

The angle of shear plane (in degrees) with respect to horizontal is __________ (rounded off to the nearest integer).

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GATE CE Soil Mechanics PYQs

Question 19

Question 23

Question 34

Question 45

Question 46

Question 53

Question 53

Question 54

Question 55

Question 55