This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Seepage Analysis – Khosla’s Theory”.
1. Khosla’s theory can be used for calculating which of the following?
a) Uplift pressure and exit gradient
b) Seepage pressure
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: Khosla’s theory has an account of flow pattern below the impermeable base of hydraulic structures, hence it can be used to calculate the uplift pressure and the gradient at the exit, called the exit gradient.
2. The failure of Naror weir in India was due to __________
a) Excessive water pressure
b) Undermining
c) Hydraulic structure
d) All of the mentioned
View Answer
Explanation: According to Leliavsky (1965), failure of Norora weir in India was due to excessive water pressure (uplift pressure) causing the floor to be blown upwards.
3. The hydraulic gradient theory of weir design was developed by __________
a) Darcy and Beresford
b) Col. Clibborn
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: In 1902, Col. Clibborn and Beresford developed the hydraulic gradient theory of weir design as a result of their experiment.
4. A hydraulic structure should not be built on pervious soil, because of _________
a) Higher water level at the upstream of the structure
b) Compressibility of the soil is low
c) Excessive water pressure above the soil
d) None of the mentioned
View Answer
Explanation: If a hydraulic structure is built on pervious soil, the higher water level at the upstream of the structure will cause seepage through the permeable soil.
5. Undermining of the sub soil is due to ___________
a) Seepage
b) Piping
c) Excessive water pressure
d) Uplift pressure
View Answer
Explanation: According to the commonly accepted ideas, the undermining is supposed to result from piping, that is, the erosion of the sub-soil by the high velocities of flow of water through it when such velocities exceed certain limit.
6. The pressure at the exit gradient at which the upward force is equal to the submerged weight of the soil is called the ___________
a) Floatation gradient
b) Bursting gradient
c) Critical gradient
d) All of the mentioned
View Answer
Explanation: The upward force is equal to the submerged weight of the soil is called the flotation gradient (Terzaghi), or bursting gradient (Haigh) or the critical gradient (Khosla).
7. The concept of undermining by ‘foundation’ was put forward by ____________
a) F.F.Haigh
b) Khosla
c) Casagrande
d) Pavlov sky
View Answer
Explanation: In 1925, professor Terzaghi put forward the conception of undermining by foundation.
8. In khosla’s theory, the stream lines occurring under a horizontal is shown in the form of __________
a) Parabola
b) Ellipse
c) Hyperbola
d) Circle
View Answer
Explanation: For the case of two dimensional flows occurring under a straight floor, the stream lines are shown as confocal ellipse.
9. Which of the following is similar to that of khosla’s theory?
a) Darcy’s theory
b) Terzaghi’s theory
c) Bligh’s theory
d) Haigh theory
View Answer
Explanation: Both Bligh’s theory and khosla’s theory deals with a finding of uplift pressure and exit gradient.
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