Soil Classification Systems Questions and Answers

Q: In soil classification and identification 'M' stands for-

In soil classification 'M' stands for Silt.In the Unified and Indian Standard soil classification, the group symbols use G for gravel, S for sand, M for silt (from the Swedish mo or mjala), C for clay, O for organic soils and Pt for peat. So ML is a silt of low plasticity and MH of high plasticity.Clay is C, organic silts and clays are O, and peat is Pt.

Q: The A-line in the casagrande's plasticity chart (uscs) for fine grained soil has the equation :

The A-line is Ip = 0.73 (\(W_{L}\) - 20).On Casagrande's plasticity chart, plasticity index is plotted against liquid limit. The empirical A-line, \(I_p = 0.73(w_L - 20)\), separates inorganic clays above it from silts and organic soils below it. The U-line, \(I_p = 0.9(w_L - 8)\), marks the upper limit found for natural soils.The other three equations, with 0.93, 0.83 or 0.65 and an intercept of 22, are not lines of the plasticity chart.

As per IS: 1498-1970, if the value of C_u \(\gt\) 6 and C_c is between 1 and 3 for clean sand, it is classified as ______.

A.poorly graded sand
B.well-graded sand
C.silty sand
D.clayey sand

Exam Year(s)

DSSSB JE - 2023,

Answer: B

Under the Indian Standard soil classification (IS 1498), a clean sand is well graded (SW) when the uniformity coefficient Cu is greater than 6 and the coefficient of curvature Cc lies between 1 and 3. Both conditions are met here. If either of them fails, the sand is poorly graded (SP). Silty sand and clayey sand are sands with more than 12 percent fines, and are classified by plasticity and fines, not by Cu and Cc, which apply to clean sand.

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In soil classification and identification 'M' stands for-

A.Clay
B.Silt
C.Organic silt and clays
D.Peat

Exam Year(s)

RSMSSB JE - 2025, RSMSSB JE Agriculture - 2025, RSMSSB - 2025,

Answer: B

In soil classification 'M' stands for Silt.

In the Unified and Indian Standard soil classification, the group symbols use G for gravel, S for sand, M for silt (from the Swedish mo or mjala), C for clay, O for organic soils and Pt for peat. So ML is a silt of low plasticity and MH of high plasticity.

Clay is C, organic silts and clays are O, and peat is Pt.

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The A-line in the casagrande's plasticity chart (uscs) for fine grained soil has the equation :

A.Ip=0.93 (\(W_{L}\) - 20)
B.Ip=0.83 (\(W_{L}\) - 22)
C.Ip=0.65 (\(W_{L}\) - 22)
D.Ip=0.73 (\(W_{L}\) - 20)

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: D

The A-line is Ip = 0.73 (\(W_{L}\) - 20).

On Casagrande's plasticity chart, plasticity index is plotted against liquid limit. The empirical A-line, \(I_p = 0.73(w_L - 20)\), separates inorganic clays above it from silts and organic soils below it. The U-line, \(I_p = 0.9(w_L - 8)\), marks the upper limit found for natural soils.

The other three equations, with 0.93, 0.83 or 0.65 and an intercept of 22, are not lines of the plasticity chart.

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