Geotechnical Engineering

Unified Soil Classification

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Coarse grained soil is sub-divided in to _______________
Gravel and clay
Gravel and sand
Sand and silt
Silt and clay
Explanation:
Based on the soil size, coarse grained soil is divided in to gravel and sand.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The USCS system was used for which of the following purpose during World War 2?
Air field construction
Dam construction
Foundation
Earth slopes
Explanation:
In the earlier stages of World War 2, the USCS system was used for air field construction.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
By USCS system, soil are classified in to ___________ Major groups.
2
5
6
4
Explanation:
Various soil are classified into four major groups
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In Casagrande’s plasticity chart, the numbers in the chart denotes ____________
Relative suitability
Grade of the soil
Division of the group
None of the mentioned
Explanation:
In Casagrande’s plasticity chart, the numbers denote relative suitability with No.1 as the best and No.10 as the worst.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Unified soil classification system (USCS) was developed by ____________
Kozney
Atterberg
Casagrande
Rankine
Explanation:
In 1940, casagrande originally developed the unified soil classification system (USCS).
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Coarse grained soils, containing fines between 5-12%, are designated by ___________ Symbol.
GW-GM and SP-SM
CL-ML
None of the mentioned
All of the mentioned
Explanation:
If the percentage of fines lies between 5 to 12 %, coarse grained soils are designated by dual symbols GW-GM or SP-SM.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
According to USCS, the fined grained soil are classified on the basis of _____________
Plasticity
Grain size distribution
Group index
Particle size composition
Explanation:
According to USCS the fine grained soils, whose behavior is controlled by plasticity, are classified on the basis of their plasticity.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
A soil is considered as coarse grained, if it retains more than ___________ in a sieve.
90% of the soil
70% of the soil
50% of the soil
20% of the soil
Explanation:
If more than 50 % of the soil is retained on a NO.200 US sieve (0.075), it is designated as coarse grained soil.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Fine grained soil are sub divided in to ___________
Silt and clay
Sand and clay
Organic and silt
Gravel and peat
Explanation:
Based on their liquid limit and plasticity index, fine grained soils are subdivided in to silt and clay.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Fine grained soil are subdivided based on ___________
Liquid limit and Plasticity index
Group Index
None of the mentioned
All of the mentioned
Explanation:
Based on the liquid limit and plasticity index, fine grained soil is subdivided.