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LE/CIVL 3110 Soil Mechanics
In-Class Quiz #01: Basic Soil Characteristics
Page 1 of 1
In-Class Quiz #01: Basic Soil Characteristics
Full Name: __________________________________________________
York U Student #:___________________
Instructions:
This in-class quiz contains
10
questions, each worth 1 mark (Total: 10 marks). All questions are
mandatory. Please circle only one answer for each question. Please remember to write your full name and
York U Student Number in the space provided. Total time allowed is
15 minutes
.
1.
Which of the following clay minerals shows least amount of shrinkage and swelling in response to
moisture change?
Illite
Kaolinite
Montmorillonite
Smectite
2.
Clay particles deposited in saltwater are more dispersed than those deposited in freshwater. True or
False?
True
False
3.
Which of the following clay structures is most susceptible to erosion and weathering?
Bookhouse
Flocculated
Dispersed
Random
4.
Clays with low ion concentration but high Sodium Adsorption Ratio (SAR) tend to be dispersive. True or
False?
True
False
5.
For a coarse-grained soil with 4% fines, D
10
= 0.2 mm; D
30
= 1 mm; D
60
= 4 mm. What would be its
second symbol as per the Unified Soil Classification System (USCS)?
P
W
C
M
6.
If a soil has 17% gravel, 41% sand, 20% silt, and 22% clay, what would be its first symbol as per the
Unified Soil Classification System?
M
G
S
C
7.
Sieve analysis on a sample of soil gave the following results: 8% gravel, 34% sand, and 58% fines. What
would be its first symbol as per the Unified Soil Classification System (USCS)?
O
C
M
Could be O, C, or M
8.
The liquid limit of an inorganic silty soil was found to be 68%. The soil plots below the A-line on the
plasticity chart. Which of the following is most likely to be its classification symbol as per the USCS?
OL
CH
ML
MH
9.
For a fine-grained soil, the liquid and plastic limit values are 70% and 30%, respectively. If its percentage
clay fraction (particle size
≤
0.002 mm) is 20%, its Activity (A) is equal to
0.5
1.5
2
3.5
10.
Atterberg limit tests on a sample of marine clay gave the following results: liquid limit = 60%; plastic limit
= 20%. If the natural water content of this soil is 40%, its liquidity index (I
L
) is equal to
0.5
1
1.5
2
-
End of the quiz
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