GATE CE topic:soil-mechanics PYQs & Answers — Page 4

Questions 31–40 of 103. Imported answers require independent review unless marked reviewed.

The specific gravity of a soil is 2.60. The soil is at 50% degree of saturation with a water content of 15%. The void ratio of the soil is ________.

Your answerChoose one option.

0.35

0.78

0.87

1.28

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A possible slope failure is shown in the figure. Three soil samples are taken from different locations (I, II and III) of the potential failure plane. Which is the most appropriate shear strength test for each of the sample to identify the failure mechanism? Identify the correct combination from the following options:

P: Triaxial compression test Q: Triaxial extension test R: Direct shear or shear box test S: Vane shear test

Diagram for Civil Engineering question 18

Your answerChoose one option.

I-Q, II-R, III-P

I-R, II-P, II-Q

I-S, II-Q, II-R

I-P, II-R, II-Q

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A vertical sheet pile wall is installed in an anisotropic soil having coefficient of horizontal permeability,

and coefficient of vertical permeability,

. In order to draw the flow net for the isotropic condition, the embedment depth of the wall should be scaled by a factor of _____, without changing the horizontal scale.

Your answerChoose one option.

1.0

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A drained direct shear test was carried out on a sandy soil. Under a normal stress of 50 kPa, the test specimen failed at a shear stress of 35 kPa. The angle of internal friction of the sample is _____________ degree (round off to the nearest integer).

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An unconfined compression strength test was conducted on a cohesive soil. The test specimen failed at an axial stress of 76 kPa. The undrained cohesion (in kPa, in integer) of the soil is __________.

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With reference to the compaction test conducted on soils, which of the following is INCORRECT?

Your answerChoose one option.

Peak point of the compaction curve gives the maximum dry unit weight and optimum moisture content

With increase in the compaction effort, the maximum dry unit weight increases

With increase in the compaction effort, the optimum moisture content decreases

Compaction curve crosses the zero-air-voids curve

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In the given figure, Point O indicates the stress point of a soil element at initial non-hydrostatic stress condition. For the stress path (OP), which of the following loading conditions is correct?

Diagram for Civil Engineering question 41

Your answerChoose one option.

is increasing and

is constant

is constant and

is increasing

is increasing and

is decreasing

is decreasing and

is increasing

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For the flow setup shown in the figure (not to scale), the hydraulic conductivities of the two soil samples, Soil 1 and Soil 2, are 10 m/s and 1 mm/s, respectively. Assume the unit weight of water as 10 kN/m

and ignore the velocity head. At steady state, what is the total head (in m, rounded off to two decimal places) at any point located at the junction of the two samples? __________________________

Diagram for Civil Engineering question 60

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A consolidated drained (CD) triaxial test was carried out on a sand sample with the known effective shear strength parameters,

and

. In the test, prior to the failure, when the sample was undergoing axial compression under constant cell pressure, the drainage valve was accidentally closed. At the failure, 360 kPa deviator stress was recorded along with 70 kPa pore water pressure. If the test is repeated without such error, and no back pressure is applied in either of the tests, what is the deviator stress (in kPa, in integer) at the failure? ________________

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Four different soils are classified as CH, ML, SP, and SW, as per the Unified Soil Classification System. Which one of the following options correctly represents their arrangement in the decreasing order of hydraulic conductivity?

Your answerChoose one option.

SW, SP, ML, CH

CH, ML, SP, SW

SP, SW, CH, ML

ML, SP, CH, SW

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GATE CE topic:soil-mechanics PYQs

Question 16

Question 18

Question 19

Question 32

Question 32

Question 40

Question 41

Question 60

Question 61

Question 17