# Classification of Soils and Clay Minerals

 Question 1
The correct match between the physical states of the soils given in Group I and the governing conditions given in Group II is
$\begin{array}{|l|l|} \hline \text{Group I}& \text{Group II} \\ \hline \text{1. normally consolidated soil}& \text{P. sensitivity > 16} \\ \hline \text{2. quick clay}& \text{Q. dilation angle = 0} \\ \hline \text{3. sand in critical state}& \text{R. liquid limit > 50} \\ \hline \text{4. clay of high plasticity}& \text{S. over consolidation ratio = 1} \\ \hline \end{array}$
 A 1-S, 2-P, 3-Q, 4-R B 1-Q, 2-S, 3-P, 4-R C 1-Q, 2-P, 3-R, 4-S D 1-S, 2-Q, 3-P, 4-R
GATE CE 2022 SET-1   Geotechnical Engineering
 Question 2
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?
 A SW, SP, ML, CH B SW, SP, ML, CH C SP, SW, CH, ML D ML, SP, CH, SW
GATE CE 2022 SET-1   Geotechnical Engineering
Question 2 Explanation:
Hydraulic conductivity Order.
Gravel $\gt$ Sand $\gt$ silt $\gt$ lay

 Question 3
From laboratory investigations, the liquid limit, plastic limit, natural moisture content and flow index of a soil specimen are obtained as 60%, 27%, 32% and 27%, respectively. The corresponding toughness index and liquidity index of the soil specimen, respectively, are
 A 0.15 and 1.22 B 0.19 and 6.60 C 1.22 and 0.15 D 6.60 and 0.19
GATE CE 2021 SET-2   Geotechnical Engineering
Question 3 Explanation:
Flow index = 27
\begin{aligned} \text { Plasticity index, } \qquad I_{P}&=W_{L}-W_{P}=33 \\ \text { Toughness index, } \qquad I_{T}&=\frac{I_{P}}{I_{f}}=\frac{33}{27}=1.22 \\ \text { Liquidity index, } \qquad I_{L}&=\frac{W_{n}-W_{P}}{W_{L}-W_{P}}=0.151 \end{aligned}
 Question 4
As per the Unified Soil Classification System (USCS), the type of soil represented by 'MH' is
 A Inorganic silts of high plasticity with liquid limit more than 50% B Inorganic silts of low plasticity with liquid limit less than 50% C Inorganic clays of high plasticity with liquid limit less than 50% D Inorganic clays of low plasticity with liquid limit more than 50%
GATE CE 2021 SET-2   Geotechnical Engineering
Question 4 Explanation:

 Question 5
A staff is placed on a benchmark (BM) of reduced level (RL) 100.000 m and a theodolite is placed at a horizontal distance of 50 m from the BM to measure the vertical angles. The measured vertical angles from the horizontal at the staff readings of 0.400 m and 2.400 m are found to be the same. Taking the height of the instrument as 1.400m, the RL (in m) of the theodolite station is _____
 A 50 B 75 C 90 D 100
GATE CE 2019 SET-1   Geotechnical Engineering
Question 5 Explanation:

\begin{aligned} x&=50 \tan \alpha \\ 2-x&=50 \tan \alpha \\ \therefore \;\;x&=2-x \\ 2x&=2 \\ x&=1m \end{aligned}
R.L of theodolite station (P): 100 + 1.4 - 0.1 - 0.4 = 100 m

There are 5 questions to complete.

### 7 thoughts on “Classification of Soils and Clay Minerals”

1. Question number 2 and 3 are of geometric engineering.

• Yes. Change the Question.

2. Good 👍job.

• Thank You Rajesh Kumar Singh,