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WorksheetsDay 31-Oct 20-PWD-worksheet-Origin of soil,grain size analysis
Total questions: 15
Worksheet time: 11mins
…………………soil exhibits swelling mainly because it contains montmorillonite
(a)
Varved clay shows alternating dark and light layers because of —
Alternating wetting-drying cycles
Alternate glacial and interglacial deposition
Organic decomposition
Differential compaction
The soil type formed in-situ by chemical leaching in warm humid climates is —
Drift
Caliche
Laterite
Aeolian
Hydrometer method is applicable only for particles finer than —
425 µ
150 µ
75 µ
4.75 mm
The most accurate laboratory method of determining water content among the following is —
Sand bath
Alcohol method
Oven drying
Radiation method
Stoke’s law becomes invalid when Brownian motion dominates.
True
False
Core-cutter method is suitable for non-cohesive soils.
True
False
The three-phase diagram becomes a two-phase diagram in………… soil and (a) soil
The method used for in-situ density of cohesionless soils is (a) .
Specific gravity in hydrometer method is obtained from corrected hydrometer reading R at the (a)
Radiometric field water content determination is based on energy loss of …………..
(a)
Write the mode of formation of soils
A. Colluvial soil……..
B. Peat ………..
C.Loess………
(a)
A soil sample has porosity n = 38% and degree of saturation S = 75%.
Find the void ratio (e).
(a)
A partially saturated soil has dry unit weight γd= 17.5 kN/m³ and water content w = 12%.
Find bulk unit weight γ.
(a)
A soil particle settles through water with a terminal velocity of
V = 1.2 × 10-4m/s.
The specific gravity of the particle is G = 2.65.
Viscosity of water η = 0.001 Ns/m2
Unit weight of water γw= 9.81 kN/m2
Calculate the particle diameter using Stoke’s Law.
(a)
