1. Flocculated structure is formed when there is a _______
a) net repulsive force
b) net attractive force
c) cohesive force
d) adhesion force
Explanation: The flocculated structure contains charged particles and these are formed when there is net attractive force between adjacent soil particles. The dispersed structure is formed when there is a net repulsive force.
2. ________ is decomposed volcanic ash containing a high percentage of clay mineral.
a) Moorum
b) Peat
c) Dune sand
d) Bentonite
Explanation: Moorum is gravel mixed with red clay. Peat is a highly organic soil which is highlt compressible and fibrous. Dune sand is non-plastic uniformly graded fine sand.
3. 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.
4. 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.
5. 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.
6. What are the forces involved in hygroscopic water or contact moisture?
a) Adhesion force
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.
7. 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 %.
8.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.
9. Based on inter-particle forces, soil water can be classified in to __________
a) Adsorbed water
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.
10. 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.