1. Choose the correct alternative: Uniformity coefficient can be expressed as D30/D10

(ii) D60 /D10

(iii) D30/D60

(iv) D^230/(D60 x D1O) The void ratio of a saturated soil with water content 15% and specific gravity 2-6 is 0-15

(ii) 0-26

(iii) 0-39

(iv) 0-45 The unconfined compressive strength of a cohesive soil is a. The cohesion of this soil will be a/2

(ii) a

(iii) 2a
3a
The total stress on the soil is 25 and pore pressure is 10 then effective stress will be (in 25

(ii) 10

(iii) 15

(iv) 35 On increasing the temperature, the permeability of soil increases
decreases slowly

(iii) decreases suddenly

(iv) does not change Zero air void line is 100% saturation line

(ii) 90% saturation line

(iii) 10% saturation line
Zero percent saturation line If the liquid limit, plastic limit and shrinkage limit of the soil are 20% and 10% respectively, then plasticity index will be

(i) 10%

(ii) 20%

(iii) 30%

(iv) 40%

2.(a) Using phase relationship, prove that
<img src='./qimages/10658-2a.jpg'>
The water content of a saturated soil is 40% and specific gravity of soil solid is 2·65. Find
the void ratio and porosity. Also find the degree of saturation, if the water content gets reduced to 10% on drying.

3.(a) Define compression index, coefficient of volume change and coefficient of consolidation.
Discuss the factors affecting compaction.

4.(a) A sand deposit is made up of three horizontal layers of equal thickness. The permeability of the top, middle and bottom layers in cm/sec are 2·1 x 3·2 x and 3·7 x cm/sec, respectively. Find the equivalent permeability in horizontal and vertical directions.
Derive the relation used for finding permeability by falling head method.

5.(a) Explain the methods of exploration by borings.
The following results are obtained from a series of drained direct shear tests on silty clay.
Find c