Geotechnical Engineering - Online Test

Q1. A multistorey building with a basement is to be constructed. The top 4 m contains loose silt below which dense sand layer is present upto a great depth. Ground water table is at the ground surface. The foundation consists of the basement slab of 6 m width which will rest on the top of dense sand as shown in figure. For dense sand saturated unit weight is 3 20kN / m3 and bearing capacity factor, Nq = 40, Nγ = 45, for loose silt saturated unit weight = 18kN / m3 , Nq = 15, Nγ = 20 . Effective cohesion is 0. Neglect depth factor average elastic modulus E, and Poisson ratio µ of dense sand is 60 ×102 kN / m2 and 0.3 respectively, using factor of safety = 3. (Take influence factor = 2)
The immediate settlement of foundation is 
Answer : Option B
Explaination / Solution:


Si = 552.48 × 6 × [1-(0.3)2]×2/(60×103) = 100.55 mm

Q2. 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
Answer : Option C
Explaination / Solution:
No Explaination.


Q3. Quick sand condition occurs when
Answer : Option D
Explaination / Solution:
No Explaination.


Q4. The e-log P curve shown in the figure is representative of 

Answer : Option B
Explaination / Solution:
No Explaination.


Q5. If σhσvσh and σv represent the total horizontal stress, total vertical stress, effective horizontal stress and effective vertical stress on a soil element, respectively, the coefficient of earth pressure at rest is given by
Answer : Option B
Explaination / Solution:
No Explaination.


Q6. Aggregate impact value indicates the following property of aggregates
Answer : Option B
Explaination / Solution:
No Explaination.


Q7. The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m . The field is to be irrigated when 50 percent of the available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75 percent. Details of crops planned for cultivation are as follows

The capacity of irrigation system to irrigate crop ‘X ’ in 36 hectares is
Answer : Option B
Explaination / Solution:
No Explaination.


Q8. The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m . The field is to be irrigated when 50 percent of the available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75 percent. Details of crops planned for cultivation are as follows
The area of crop ‘Y ’ that can be irrigated when the available capacity of irrigation system is 40 litres/sec is
Answer : Option D
Explaination / Solution:
No Explaination.


Q9. In Marshall testing of bituminous mixes, as the bitumen content increases the flow value
Answer : Option C
Explaination / Solution:
No Explaination.


Q10. The unconfined compressive strength of a saturated clay sample is 54 kPa. The value of sobesion for the clay is
Answer : Option C
Explaination / Solution:
No Explaination.