1. The formation of concave meniscus in capillary tubes takes place, only if ___________
a) Inner tubes is dry
b) Tube has non-uniform diameter
c) Inner tube is wet
d) Diameter of the tube is larger
Explanation: Concave meniscus will only take place if the inner walls of the tubes are initially wet. If the walls are dry, a depressed convex meniscus will be formed.
2. The water in the sandy soil is __________
a) Pore water
b) Ground water
c) Free water
d) Infiltrated water
Explanation: In the sandy soil there is no significant force of attraction between the soil particles, hence it contains pore water.
3. Coarse grained soil relatively has __________ hygroscopic capacity.
a) High
b) Low
c) Very low
d) Very high
Explanation: Coarse-grained soils have relatively low hygroscopic moisture due to their limited specific surface.
4. The maximum hygroscopic capacity of clay is __________
a) 1 %
b) 3 %
c) 7 %
d) 17 %
Explanation: The ratio of water adsorbed by dry soil in a saturated atmosphere at a given temperature to the weight of oven-dried soil, has the following average values Sands 1% silts 7%, clays 17 %.o
5.Volume change in soil is due to which of the following factor?
a) Water content is changed
b) Increase in soil density
c) Change in pressure
d) Change in particle size
Explanation: Decrease in the water content of the soil causes shrinkage while an increase of water content causes swelling.
6. Large volume changes in clayey soils results in ____________
a) Increase in capillary pressure
b) Structural damage
c) Decrease in surface area
d) Breaking of bonds
Explanation: Clayey soil has very little shrinking and swelling capacity, therefore a large change in volume results in extensive structural damages.
7. Free swell of a soil can be defined as ____________
a) Swelling of soil without shrinkage
b) Increase in volume without any constrains
c) Limited swelling on rewetting
d) Swelling on submergence in water
Explanation: As per IS: 2720-part 40, free swell of a soil is defined as increase in volume of a soil without any constrains, on submergence in water.
8. What are the minerals, responsible for large volume decrease in soil on drying in clayey soils?
a) Ilite and Kaolinite
b) Montmorillonite
c) None of the mentioned
d) All of the mentioned
Explanation: When illite and kaolinite minerals are present in clay soil, the soil exhibit large initial volume decrease on drying.
9. Formation of meniscus in a saturated soil causes ____________
a) Compression in the soil structure and Reduction in the volume
b) Decrease in the water content
c) None of the mentioned
d) All of the mentioned
Explanation: Formation of meniscus in dry saturated soil, causes tension in the soil water leading to a compression in the soil structure and consequent reduction in the volume.
10. When does surface Tension in the water become zero?
a) When the soil is completely dried
b) When the soil is fully saturated
c) When the water evaporates
d) None of the mentioned
Explanation: Initially when the soil is fully saturated, the capillary space between the particles are completely filled with water, therefore the tension in the water becomes zero at this stage.