The angle between the directions of the failure and the major principal plane, i

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Question
The angle between the directions of the failure and the major principal plane, is equal to
Options
A. 90� + effective angle of shearing resistance
B. 90� + half of the angle of shearing resistance
C. 45� - half of the angle of shearing resistance
D. 45� + half of the angle of shearing resistance.

Correct Answer

45� + half of the angle of shearing resistance.

1. The ratio of the difference between the void ratio of the soil in its loosest state and its natural void ratio (e) to the difference between the void ratios in the loosest and fully dense state, is generally termed as
Options
A. degree of density
B. relativity
C. density index
D. all the above.

2. For shear strength, triaxial shear test is suitable because
Options
A. it can be performed under all three drainage conditions
B. precise measurement of the pore pressure and volume change during the test is possible
C. stress distribution on the failure plane, is uniform
D. state of stress within the specimen during any stage of the test as well as at failure, is completely determined
E. all the above.

5. Pick up the correct statement from the following:
Options
A. The property of a soil that enables it to become stiff in a relatively short time on standing is called thixotropy
B. The ratio of shear strength in natural state to the remoulded shear strength under undrained conditions, is called degree of sensitivity.
C. The difference between the undisturbed shear strength and remoulded shear strength is known remoulding loss
D. The tendency of dense sand to expand on application of shearing load, is known as dilatancy
E. All the above.

6. The earth pressure of a soil at rest, is proportional to (where ? is the angle of internal friction of the soil)
Options
A. tan (45� - ?)
B. tan (45� + ?)
C. tan² (45� - ?)
D. tan² (45� + ?)
E. none of these

7. Pick up the correct statement from the following:
Options
A. Illite bond is weaker than Kaolinite bond
B. Illite bond is stronger than montmorillonite bond
C. Illites do not swell when wet
D. Illites are composed of two silica tetrahedralsheets with a central octahedral sheet
E. All the above.

8. Pick up the correct statement from the following:
Options
A. If the ratio of depth to width is less than 2, it is shallow foundation
B. If the ratio of depth to width is more than 2, it is deep foundation
C. If the ratio of the length to width is between 1 and 2, it is spread foundation
D. If the length is large as compared to width, it is a strip foundation
E. All the above.

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