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Match List-I (Soil description) with List-ll (Coefficient of permeability, mm/s) and select the correct answer using the codes given below the lists:
B. Clay silt admixtures
D. Homogeneous clays
Permeability of Gravel (>1) > Sand (10-2 – 10-4) > Silt (10-4 – 10-6) > Clay (< 10-6)
Match List-I with List-ll and select the correct answer using the codes given below the lists:
C. Alluvial soil
1. Deposited from suspension in running water
2. Deposits of marine origin
3. Deposits by wind
4. Organic soil
Correct Answer :- d
Explanation : a) Loess is a deposit of wind-blown silt that blankets large areas of the continents. It is often light brown in color, consisting predominantly of quartz, feldspars, micas, and calcium carbonate.
b) Soil scientists define peat as organic soil with organic content of greater than 35%. To a geotechnical engineer, however, all0 soils with an organic content of greater than 20% are known as organic soil, while “peat” is an organic soil with organic content of more than 75%.
c) Soils deposited in riverbeds are known as alluvial deposits.The size of particles deposited in riverbeds depends on the speed of flow. If the flow of a river is strong, only large cobble-type material can get deposited.
d) Marl or marlstone is a carbonate-rich mud or mudstone which contains variable amounts of clays and silt. The term was originally loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwater conditions. These typically contain 35–65% clay and 65–35% carbonate.The term is today often used to describe indurated marine deposits and lacustrine (lake) sediments which more accurately should be named 'marlstone'
Which of the following type of soil is transported by gravitational forces?
Soil carried and deposited by river water are alluvial soils. Deposits made in lakes are lacustrine deposits. Wind transported soil are aeolian deposits. Drift is a general term used for the deposits made by glaciers. Deposits directly made by melting of glaciers are called till. Talus are colluvial soil deposited by gravity.
According to IS classification, the range of silt size particles is:
List-I (Type of soil) with List-ll (Feature) and select the correct answer using the codes given below the lists:
1. Transported by wind
2. Transported by running water
3. Deposited at the bottom of lakes
4. Deposited in seawater
Lacustrine-Deposited at the bottom of lakes
Alluvial - Transported by running water
Aeolian - Transported by wind
Marine - Deposited in sea water
Match List-I (Range of particle size) with List-II (Type of soil) and select the correct answer using the codes given below the lists:
According to IS grain-size classification
The correct increasing order of specific surface i.e. surface area per mass of the given soils is:
Consider the following statements in the context of aeolian soils:
1. The soil has low density and low compressibility.
2. The soil is deposited by wind.
3. The soil has large permeability.
Which of these statements are correct?
Aeolian soil is a soil which is transported by wind and is mostly sand, thus, has high permeability.
The collapsible soil is associated with
Collapsible soil is mainly a clayey silt also known as loess.
Bentonite is a material obtained due to the weathering of
Bentonite is decomposed volcanic ash containing high percentage of clay mineral-montmorillonite.