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Here below you can find the GATE Civil Engineering solved question with explanations in the topic of Soil Mechanics – Phase relations | Origin of soil | Soil classification. Which is very useful for the upcoming GATE 2021 examination.

Question No. 1: The avoid ratios at the densest, loosest and the natural states of a sand deposit are 0.2, 0.6, and 0.4, respectively. The relative density of the deposit is
(A) 100% (B) 75% (C) 50% (D) 25%

Answer: 50%


Question No. 2: A soil has void ratio = 0.72, moisture content = 12% and Gs= 2.72. Determine its
(a) Dry unit weight
(b) Moist unit weight, and the
(c) Amount of water to be added per m3 to make it saturated.


(a)   = 15.51 kN/m3

 = 17.38 kN/m3
(c)  = 

 = 19.62 kN/m3

Water to be added per m3 to make the soil saturated
 = 19.62 – 17.38 = 2.24 kN

Question No.3: The undrained cohesion of a remoulded clay soil is 10 kN/m2 . If the sensitivity of the clay is 20, the corresponding remoulded compressive strength is
(a) 5 kN/m2 (b) 10 kN/m2 (c) 20 kN/m2 (d) 200 kN/m2

Answer: 20 kN/m2

Explanation:Compressive strength = 2C =20 kN/m2

Question No.4: The dry density of a sand with porosity of 0.387 is 1600 kg/m3. Find the void ratio of the soil and the specific gravity of the soil solids. [Take ]
  n = 0.387
 = 1600 kg/m3

(a) e =  =  = 0.631

(b)  = 
 Gs = 

Question No.5: Match list-I (type of soil) with list-II (mode of transportation and deposition) and select the correct answer using the codes given below the lists:
List – I

A. Lacustrine soils
B. Alluvial soils
C. Aeolian soils
D. Marine soils
1. Transportation by wind
2. Transportation by running water
3. Deposited at the bottom of lakes
4. Deposited in seawater
   A B C D
a. 1 2 3 4
b. 3 2 1 4
c. 3 2 4 1
d. 1 3 2 4 

Answer: b. 3 2 1 4

Question No.6: The liquid limit and plastic limit of samples are 65% and 29% respectively. The percentage of soil fraction with grain size finger than 0.002 mm is 24. The activity ratio of the soil  sample is
(a) 0.05 (b) 1.00 (c) 1.50 (d) 2.00

Answer: 1.50


Question No.7: Lacustrine soils are soils
(a) Transported by rivers and streams
(b) Transported by glaciers
(c) Deposited in sea beds
(d) Deposited in lake beds

Answer: (d) Deposited in lake beds

Question No.8: The dry density of a soil is 1.5 g/cc. If the saturation water content were 50% then its saturated density and submerged density would, respectively, be
(a) 1.5 g/cc and 1.0 g/cc
(b) 2.0 g/cc and 1.0 g/cc
(c) 2.25 g/cc and 1.25 g/cc
(d) 2.50 g/cc and 1.50 g/cc

Answer: (c) 2.25 g/cc and 1.25 g/cc


Question No.9: Consider the following statements: A Well-graded sand should have
1. Uniformity coefficient greater than 6
2. Coefficient curvature between 1 and 3
3. Effective size greater than 1mm
Which of the statements are correct?
(a) 1, 2 and 3 (c) 1 and 2
(b) 1 and 3 (d) 2 and 3

Answer: (c) 1 and 2

Question No.10: Based on grain distribution analysis, The D10, D30 and D60 values of a given soil are 0.23mm, 0.3mm and 0.41mm respectively. As per IS code, the soil classification will be
a) SW b) SP c) SM d) SC

Answer: b) SP


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