Geotechnical Engineering

Determination of Liquid and Plastic Limit

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The toughness index (It) is defined by the ratio of __________
It=WP/IP
It=IP/If
It=IF/IP
It=WL/If
Explanation:
Toughness index (It) is determined by the ratio of plasticity index to the flow index: It=IP/If.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
What is the diameter of the sieve that is used for finding the liquid limit?
275 microns
700 microns
425 microns
200 microns
Explanation:
425 micron sieve is used as a standard, for filtering the given specimen.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The soviet liquid limit device is based on the principle of ___________
Station penetration
Soil moisture
Soil water content
None of the mentioned
Explanation:
Static cone penetration method is used in operation of soviet liquid limit device.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
One-point method, used for determining the liquid limit is majorly applicable for finding ________
Accurate value
Precise value
Rough value
None of the mentioned
Explanation:
Since the liquid limit is found out by only one reading of water content and its corresponding number of blows. One point method is applicable for finding rough value.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The grooving tool which is used for finding liquid limit is _________
ASTM tools
Grooving tools
All of the mentioned
None of the mentioned
Explanation:
ASTM tool and casagrande tools are two types of grooving tools are used in determining liquid and plastic limit.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The cone which is used to penetrate the soil pat has a central angle of ___________
26 degree
30 degree
31 degree
40 degree
Explanation:
The cone has a central angle of 31° since the total sliding mass is 80 g.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The number of revolutions per second, at which the handle is rotated in process of finding the liquid limit is _________
2
7
4
9
Explanation:
In liquid limit apparatus, the handle is rotated at a rate of about 2 revolutions per second.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The type of tools which is preferred for sandy soil for the purpose of grooving is _______
ASTM tool
Casagrande tool
All of the mentioned
None of the mentioned
Explanation:
ASTM tool is used only for more sandy soil, where the Casagrande tool tends to tears the side of the groove.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The plastic index is calculated from the relation ____________
IP = WP-WL
IP = WL-WP
IP= IL-IS
IP=IW-IS
Explanation:
The plasticity index is given by the formula, IP=WL-WP.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The depth of the groove cut by casagrande tool for determining the liquid limit is ______
10 mm
11.0 mm
2 mm
8 mm
Explanation:
The casagrande tools cut a groove of size 11.0 mm wide at the bottom.