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GATE 2020 National Champion Test: Geotechnical Engineering (App update required to attempt this test)

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Question 1

From the particle-size distribution curve, the diameter of particle size corresponding to 10% finer, 30% finer and 60% finer are 0.16mm, 0.18mm and 0.28mm respectively. Determine the three parameters namely D10, Cu & Cc required to classify the granular soils.

Question 2

The relative compaction of a granular soil road base in- situ is 85%. The maximum and the minimum dry unit weight of the sample are 19.4 kN/m3 and 13.2 kN/m3. Determine the bulk unit weight in field when its moisture content is 17%.

Question 3

Which of the following statement is INCORRECT?

Question 4

Which one of the following conditions is valid in case of unconfined compression test in comparison to triaxial test?

Question 5

To determine the relative density of sand sample, the natural moisture content and bulk density were determined in the field and found to be 6% and 1.56 respectively. Sample of this soil was then compacted in proctor mould of 1000 cc and the following data was obtained.
Wt. of empty mould = 2000g
Wt. of mould + soil in loosest state = 3300 g
Wt. of mould + soil in densest state = 3850 g
Moisture content used in test = 10%
The relative density of soil is lie % is?

Question 6

In the test set up as shown in figure, two different granular soils are placed in permeameter and flow is allowed to take place under a constant total head of 30 cm. If 30% of the total head is lost as water flows upward through lower soil layer, then the total head (in cm) and pressure head (in cm) at B are respectively

Question 7

An unsupported excavation is made to the maximum possible depth in a pure clay soil having density 20 kN/m3 and cohesion = 100 kN/m2. The active earth pressure (in kN/m2) at base level of excavation is

Question 8

Boring method is to be chosen depending upon the type of exploratory strata. In this context, Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A) Auger boring
B) Wash boring
C) Percussion drilling
D) Rotary drilling

List-II
1) Partly saturated sands, silts and medium of stiff cohesive soils.
2) All types of soils and rocks except in stony or porous soils and fissured rocks.
3) Practically all types of soils except hard and commented soil or rock.
4) All types of soils and rocks. Difficult in loose sands and soft sticky clays.

Question 9

A region has a c-Φ soil, the soil factors of the soil are C= 50KPa, unit weight of the soil 20KN/m3 and bearing capacity factors Nc, Nq, and Nγ are 8, 3 and 2 respectively. If the width of the footing is 2m and depth is 1m.
Find the net ultimate bearing capacity (in kN/m2)

Question 10

A soil startum of dry dense sand with an average E value of 30 x 103kN/m2, for depth 10 m and below that to a depth of 25 m with an average E value of 60 x 103 kN/m2, then the immediate settlement beneath the centre of a 5 m x 5 m flexible footing resting of 0.5 m depth and applying a stress of 100 kN/m2 is _____ mm.
[Take Poisson’s ratio (μ) = 0.3 and influence value for is 1.12]

Question 11

A 25m deep bored pile has a shaft of diameter 1m and enlarged base of 2.5m diameter in lower 1.5m depth. The undrained cohesion of soil varies from 100 kN/m2 at top to 150 kN/m2 at base. Determine the safe load(in kN). Take factor safety = 2.5 and adhesion factor = .45

Question 12

Consider the following statements:
Problems regarding foundations to be constructed in expansive soils are solved by
(i) Resorting to light foundation pressure
(ii) Using under-reamed piles for light loads
(iii) Making the structure rigid enough so that settlement and uplift would not affect them
(iv) Providing a well-designed basement with the foundation below the neutral point
Which of the above statements are correct?
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Jan 21ESE & GATE CE