Geotechnical Engineering

Activity of Clays

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The sensitivity of most clays usually falls in a range of _________
2 to 8
1 to 6
1 to 8
1 to 5
Explanation:
From referring sensitivity classification table, it can be seen that clays have a common sensitivity between 1 to 8.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Based on activity number, clays can be classified in to_______ categories.
Five
Two
Three
More than five
Explanation:
Clays are classified into 3 types as kaolinite, illite, and montmorillonite.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
For a clay to be active, the activity of it should be __________
0.75-1.40
>1.40
<0.75
<0.75
Explanation:
Based on activity number, the activity should be greater than 1.4 for clay to be active.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The typical activity value of illite, present in clay is________
0.4-0.5
0.5-1.0
1.0-7.0
2.7-5.3
Explanation:
Typical active values are kaolinite: 0.4-0.5
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A clay is said to be inactive, if the activity is_________
<0.75
0.75-1.40
>1.40
None of the mentioned
Explanation:
Clay is classified as inactive if the activity is less than 0.75.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The plasticity of clay depends on which of the following?
The nature of clay minerals present
Volume of clay present
All of the mentioned
None of the mentioned
Explanation:
The plasticity depends on i) The nature of clay minerals present ii) amounts of clay minerals present.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Activity of a clay can be determined by laboratory test like __________
Wet analysis
Liquid limit
Plastic limit
All of the mentioned
Explanation:
Activity can be determined by from the result of usual laboratory tests such as wet analysis, liquid limit, and plastic limit.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Clay containing kaolinite, will relatively have a_________ activity.
High
Intermediate
Low
Moderate
Explanation:
Clay containing will have relatively low activity, while montorillonite have high activity.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Based on the observation made by Skempton, for a given soil __________
Plastic index is proportional to percent of clay-size fraction
Plastic index is inversely proportional to percent of clay-size fraction
Plastic index is equal to percent of clay-size fraction
None of the mentioned
Explanation:
In 1953 skempton, observed that for a given soil the plasticity index is proportional to the percent of clay-size fraction.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Highly over consolidating clays tends to be _________
sensitive
normal sensitive
less sensitive
extra sensitive
Explanation:
This type of clay tends to have sensitive of 1(unity). Hence it is classified as in sensitive.