# Geotechnical Engineering Questions and Answers – Modes of Occurrences of Water in Soil

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Modes of Occurrences of Water in Soil”.

1. Ground water may be also called as ___________
a) Capillary water
b) Gravitational water and Free water
c) None of the mentioned
d) All of the mentioned

Explanation: Since the ground water is subjected to no forces other than gravity. Hence the water is also known as gravitational water or free water.

2. Water present in the voids of soil mass is called __________
a) Soil water
b) Free water
c) Ground water
d) Pore water

Explanation: Soil water is the water present in the voids of the soil mass.

3. Hygroscopic water is affected by which of the following factor?
a) Gravity
b) Capillary forces
c) All of the mentioned
d) None of the mentioned

Explanation: Since hygroscopic water has greater density and viscosity than ordinary water. It is neither affected by gravity or capillary forces or by any other force.

4. What are the forces involved in hygroscopic water or contact moisture?
b) Capillary force
c) All of the mentioned
d) None of the mentioned

Explanation: In hygroscopic water, soil particle freely adsorbs water from the atmosphere by the physical force of attraction, and is held by adhesion force.

5. The average hygroscopicity of clay is ___________
a) 6 %
b) 16 %
c) 1 %
d) 4 %

Explanation: The average hygroscopicity of sands, silts and clay is 1 %, 6 % and 16 %.
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6. The water which soaks in to ground by moving downward, subjected to capillary force is ___________
a) Ground water
b) Pore water
c) Infiltrated water
d) Capillary water

Explanation: Infiltrated water is the portion of surface precipitation which soaks into ground moving downward through air-containing zones.

7. Based on inter-particle forces, soil water can be classified in to __________
b) Pore water
c) All of the mentioned
d) None of the mentioned

Explanation: Adsorbed water which is attracted by forces within the soil and pore water are the two types of soil water divided based on inter-particle forces.

8. Solvate water is subjected to __________ forces.
a) Polar
b) Electrostatic
c) Binding
d) All of the mentioned

Explanation: Since the solvate water forms a hydration shell around soil grain. It is influenced by ionic and polar forces.

9. The soil water which is impossible to remove from the soil is ___________
a) Structural water
b) Capillary water
c) Solvate water
d) Pore water

Explanation: Under loading encountered in soil engineering, it is found out that structural water cannot be separated or removed and therefore it is considered as a part and parcel of the soil particle.

10. Ground water is influenced by ____________ force.
a) Vander Waals force
b) Surface force
c) Hydrodynamic force
d) Electro static force

Explanation: As the ground water obeys laws of hydraulic force, it is capable of moving under hydrodynamic forces.

11. Water can be classified in to __________ types based on structural aspect.
a) 3
b) 5
c) 2
d) 4

Explanation: Structural classifications of water in a soil are 4 types, which are: pore water, solvate water, adsorbed water, structural water.

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