This set of Geotechnical Engineering Problems focuses on “Interparticle Force in a Soil Mass”.
1. There are _________ possible type of attractive forces.
a) 4
b) 5
c) 6
d) 2
View Answer
Explanation: There are 6 types of attractive forces.
i) vanderwaal’s London force
ii) hydrogen
iii) bond, cationic linkage
iv) di-pole cationic linkage
v) water dipole linkage
vi) ionic bond.
2. Which of the following type of attraction force act between two-particle carrying negative charges?
a) Vander Waal’s London force
b) Water-dipole linkage
c) Ionic bond
d) Cationic linkage
View Answer
Explanation: The cationic linkage act as bridge between two adjacent particle carrying negative charges.
3. The repulsive force between the soil colloids become effective when?
a) They approach other
b) They combine with each other
c) They are at a distance
d) They overlap
View Answer
Explanation: When two soil colloids approach each other close enough, the double layer tend to overlap and interact.
4. Which of the following, is considered to be a universal attractive force?
a) Gravitational force
b) Dipole-cationic linkage
c) Ionic bond
d) Vander Waal’s London force
View Answer
Explanation: Since the vanderwaal’s London force effective in many soils, where other is not it is considered as a universal attractive force.
5. The type of bond in kaolinite crystal is _____________
a) Cationic linkage bond
b) Hydrogen bond
c) Linkage bond
d) Ionic bond
View Answer
Explanation: The edges of two kaolinite crystal are joined by two cations. Hence cationic linkage bond exist in kaolinite crystal.
6. The repulsive force in soil particle is due to ____________
a) Particles are attracted to each other
b) Particles are similarly charged
c) Particles are oppositely charged
d) None of the mentioned
View Answer
Explanation: Since the particles are similarly charged (negative) they repel each other causing repulsive force.
7. The cationic linkage is similar to the intersheet bonds of ____________
a) Kaolinite
b) Illite
c) Dichite
d) Montmorillonite
View Answer
Explanation: The cationic linkage is similar to the intersheet bonds of illite since particle can be linked together through water-cation-water mechanism.
8. Between the soil particles, the cation charge may be entirely balanced by ____________
a) Particle repulsion
b) Negative charge
c) Cationic charge
d) Particle charge
View Answer
Explanation: The cation may be entirely balanced by particle charge so that there is no cation-cation repulsion.
9. There is no strong repulsive force between soil particles because ____________
a) Mobile cation will move along the surface
b) Cation will move opposite to each other
c) Cations replace each other
d) None of the mentioned
View Answer
Explanation: The mobile cations will move along the particle surface of positions which is balanced by particle charge there. Therefore repulsive force does not exist.
10. The gravitational force between two soil particle is ____________
a) Proportional to charge
b) Proportional to area
c) Proportional to mass
d) Proportional to surface
View Answer
Explanation: When the mass of the particle increases, the gravitational force acting downward on the particle increases. Hence both mass and gravitational force are proportional to each other.
Sanfoundry Global Education & Learning Series – Geotechnical Engineering.
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