![MCQs [2024]](https://engineeringinterviewquestions.com/wp-content/uploads/2021/02/Interview-Questions-2.png)
Geotechnical Engineering Multiple Choice Questions on “Mechanical Stabilisation”.
1. Stabilisation of soils are most commonly used in __________ engineering works.
a) Air-field pavements
b) Foundations of buildings
c) Pile construction
d) All of the mentioned
Answer: a
Clarification: The most common application of stabilisation is in the construction of roads and air-field pavements.
2. Method of stabilisation can be grouped under________ main types.
a) three
b) two
c) one
d) four
Answer: b
Clarification: Method of stabilisation may be grouped under two main categories: i) modification of soil property of existing soil without any admixture ii) modification of soil property with the help of admixtures.
3. Example of modification of soil property with the help of admixtures is _________
a) Compaction
b) Drainage
c) Mechanical stabilisation
d) Particle size distribution
Answer: c
Clarification: Example of modification of soil property with the help of admixtures is: mechanical stabilization, stabilization with cement, lime, bitumen and chemicals etc.
4. The important factors that governs the engineering behavior of soil are _________
a) Densification
b) Stabilisation
c) Tensile strength
d) Particle size distribution
Answer: d
Clarification: The particle size distribution and composition are the important factors governing the engineering behavior of soil.
5. Mechanical stabilisation of soil involves which of the following operation?
a) Compaction and Changing the composition of soil
b) Leveling
c) None of the mentioned
d) All of the mentioned
Answer: a
Clarification: Mechanical stabilisation involves two operations: i) changing the composition of soil by addition or removal of certain constituents, and ii) densification or compaction.
6. For mechanical stabilized bases, liquid limit should not exceed __________
a) 35 %
b) 25 %
c) 50 %
d) 10 %
Answer: b
Clarification: For bases, liquid limit should not exceed 25 % and plasticity index must not exceed 6.
7. The properties of a soil under compaction depend upon _________
a) Swelling
b) Placement condition
c) Water content
d) Permeability
Answer: c
Clarification: The properties of soil under compaction depend upon the water content, amount of compaction, and the type of compaction.
8. The properties of soil that are affected by compaction are __________
a) Swelling
b) Water absorption
c) Permeability
d) All of the mentioned
Answer: d
Clarification: Compaction has a great effect on soil properties, such as strength and stress-strain characteristics, permeability, compression, swelling, and water absorption.
9. The soil stabilised with cement is called _________
a) Lime cement
b) Soil cement
c) Cementing soil
d) None of the mentioned
Answer: b
Clarification: The soil stabilised with cement (Portland cement) is usually known as soil cement.
10. The important factor affecting soil cement is________
a) Admixtures
b) Swelling
c) Water absorption
d) Permeability
Answer: a
Clarification: The important factors affecting the soil cement are: nature of soil, cement content, condition s of mixing, compaction and curing and admixtures.
11. The binding action of individual particles through cement is possible only in __________ type of soil.
a) Fine-grained soil
b) Clayey soil
c) Coarse-grained soil
d) All of the mentioned
Answer: c
Clarification: The binding action of individual particles through cement may be only possible in coarse-grained soil. In fine-grained, cohesive soils, only some of the particles can be expected to have cement bonds, and the rest may be bonded through natural cohesion.