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WorksheetsDay 32-Oct 21-WorksheetPWD-consistency limits,PSD,classification
Total questions: 15
Worksheet time: 9mins
A soil shows low IP & low Activity. This indicates that the clay mineral present is —
Montmorillonite
Illite
Kaolinite
Chlorite
For Darcy’s law to remain valid in a dense silty soil, the MOST critical condition is —
Fully saturated soil
Partially saturated soil
Unsaturated soil
Valid in all 3
Capillary rise is highest in —
Coarse sand
Fine sand
Silt
Clay
A clay with high plasticity index and high Toughness Index always exhibits high sensitivity.
True
False
Darcy’s law becomes invalid even in laminar flow if the soil is partially saturated.
True
False
Assertion (A): A soil having Liquidity Index IL > 1 is less susceptible to shear failure. Reason (R): Because its natural water content which is below the liquid limit provides high shear strength.
A true,R true
A false,R false
A is true but R is false
A is false but R is true
The regaining of strength in clay after remoulding at constant water content is called (a) .
A clay having low IP even with high clay fraction is called (a) clay (by activity).
Water held tightly around particles by adhesion forces is termed (a) water.
The permeability of soil is defined at (a) hydraulic gradient.
A kink or hump in a particle size distribution curve indicates (a) grading.
A soil with sensitivity greater than 16 is termed (a) clay.
Seepage velocity is always greater than discharge velocity.Is this statement true?
(a)
A soil has particle sizes: D10= 0.12 mm, D30= 0.36 mm, D60 = 0.90 mm.
(i) Compute Cuand Cc.
(ii) Classify the soil’s gradation (well graded / poorly graded / gap graded) based on the values
(a)
A clay has LL = 62%, PL = 28%, and natural water content wn =48%.
From a Casagrande test, the following (w, N) pairs are observed:
(54%, 12 blows), (50%, 17 blows), (47%, 25 blows).
Compute: plasticity index,liquidity index,consistency index
(a)
