1. 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.
2. 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.
3. 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.
4. Capillary water is located in part of ___________ soil mass.
a) Within the voids in soil
b) Above the ground water surface
c) Pores in the soil mass
d) Surface of soil particles
Explanation: Capillary water is the soil moisture located within the interstices and voids of capillary forces.
5. The capillary force of water depends on __________
a) Surface tension of water
b) Pressure in water
c) Conformation of soil pores
d) All of the mentioned
Explanation: The capillary force of soil moisture depends upon various factors such as surface tension of water, pressure in water relation to atmospheric pressure, and the size and conformation of soil pores.
6. The surface tension of water (TS) is __________
a) 29 dynes per cm
b) 72.8 dynes per cm
c) 0.29 dynes per cm
d) 2.45 dynes per cm
Explanation: The surface tension = 0.728×10-6 KN/cm at 20°c
=072.8 dynes per cm.
7. The coefficient of surface tension depends on which of the following?
a) Chemical nature of liquids
b) Surface area of the liquid
c) Forces acting
d) Atmospheric pressure
Explanation: Since surface tension is the property of the molecules on the surface of the liquid body, the coefficient depends on the chemical nature.
8. The meniscus formation in capillary tubes always be ___________
a) Convex
b) Concave
c) Equilibrium
d) None of the mentioned
Explanation: Since the soil pores always carry adsorbed water, the meniscus formation in capillary tube will always be concave.
9. When a capillary tube of uniform-section is lifted from the water surface, water in the tube will be __________
a) Retained
b) Not retained
c) Retained partially
d) None of the mentioned
Explanation: Since the upward force due to surface tension are balanced by downward force at the lower end there will be no water retained in the tube.
10. The height of capillary rise in capillary tube, depends on ____________
a) Diameter of the tube
b) Surface tension
c) Direction of flow of water
d) All of the mentioned
Explanation: If a capillary tube is of non-uniform diameter height of capillary rise will be depending upon the direction of flow of water in the tube.