31. In an untrained triaxial test on a saturated clay, the Poisson’s ratio is

1. 1. σ3

      (σ1 + σ3)

   
   
   

   2. σ3

      (σ1 - σ3)

   
   
   

   3. σ1 - σ3

      σ3

   
   
   

   4. σ1 + σ3

      σ3

   
   
   

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1. View Hint View Answer Discuss in Forum

   η =	σ3
   	σ1 + σ3

   Correct Option: A

   η =	σ3
   	σ1 + σ3

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32. Identify the two FALSE statements from the following four statements.
    I. The consolidation of soil happens due to the change in total stress.
    II. When Standard Penetration Tests are performed in fine sands below the water table, the dilation correction is applied after the overburden correction is applied.
    III. Over consolidated clay's will have predominantly cohesive strength as compared to the frictional strength.
    IV. Compaction of soils is due to expulsion of water.

1. 1. II & III

   
   
   

   2. I & IV

   
   
   

   3. I & III

   
   
   

   4. II & IV

   
   
   

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1. View Hint View Answer Discuss in Forum

   Consolidation is due to change in effective stress Compaction is due to expulsion of air, consolidation is due to expulsion of water

   Correct Option: B

   Consolidation is due to change in effective stress Compaction is due to expulsion of air, consolidation is due to expulsion of water

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33. The following two statements are made with respect to different sand samples having the same relative density. Identify if they are TRUE or FALSE.
    I. Poorly graded sands will have lower friction angle than the well graded sands.
    II. The particle size has no influence on the friction angle of sand.

1. 1. II is TRUE but I is FALSE.

   
   
   

   2. Both are FALSE statements

   
   
   

   3. Both are TRUE statements

   
   
   

   4. I is TRUE but II is FALSE.

   
   
   

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1. View Hint View Answer Discuss in Forum

   I is TRUE but II is FALSE.

   Correct Option: D

   I is TRUE but II is FALSE.

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34. A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the plasticity chart, according to IS classification, the soil is represented by the letter symbols

1. 1. CL

   
   
   

   2. CI

   
   
   

   3. CH

   
   
   

   4. CL-ML

   
   
   

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1. View Hint View Answer Discuss in Forum

   PI = w_L – w_P.
   = 60 – 20 = 40
   ∵ PO > 17 it is clayey soil
   ∵ wL > 50 it is highly plastic.
   ∴ soil is CH.

   Correct Option: C

   PI = w_L – w_P.
   = 60 – 20 = 40
   ∵ PO > 17 it is clayey soil
   ∵ wL > 50 it is highly plastic.
   ∴ soil is CH.

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35. In a constant head permeameter with cross section of 10 cm², when the flow was taking place under a hydraulic gradient of 0.5, the amount of water collected in 60 seconds is 600 cc. The permeability of the soil is

1. 1. 0.002 cm/s

   
   
   

   2. 0.02 cm/s

   
   
   

   3. 0.2 cm/s

   
   
   

   4. 2.0 cm/s

   
   
   

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1. View Hint View Answer Discuss in Forum

   Q = k_iA
   

   Q =	600	= 10 cm3/s
   	60

   
   ∴ 10 = k × 0.5 × 10
   ∴ k = 2 cm/s

   Correct Option: D

   Q = k_iA
   

   Q =	600	= 10 cm3/s
   	60

   
   ∴ 10 = k × 0.5 × 10
   ∴ k = 2 cm/s

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