If the shearing stress is zero on two planes, then the angle between the two planes is________________?

Related Mcqs:

1. A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of_________________?

   A. 7°
   B. 10°
   C. 12°
   D. 17°

2. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively______________________?

   A. 0.5 N/mm2 and 30°
   B. 0.05 N/mm2 and 0°
   C. 0.2 N/mm2 and 0°
   D. 0.05 N/mm2 and 45°

3. In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on__________________?

   A. horizontal plane only
   B. vertical plane only
   C. both horizontal and vertical planes
   D. all planes except horizontal and vertical planes

4. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is__________________?

   A. 10 mm
   B. 20 mm
   C. 40 mm
   D. none of the above

5. The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is________________?

   A. vertical if the soil is in an active state of plastic equilibrium
   B. vertical if the soil is in a passive state of plastic equilibrium
   C. inclined at 45° to the vertical plane
   D. none of the above

6. When the degree of saturation is zero, the soil mass under consideration represents______________?

   A. one phase system
   B. two phase system with soil and air
   C. two phase system with soil and water
   D. three phase system

7. If the plasticity index of a soil mass is zero, the soil is______________?

   A. sand
   B. silt
   C. clay
   D. clayey silt

8. The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is___________________?

   A. 1/3
   B. 3
   C. 1
   D. 1/2

9. The angle that Coulomb’s failure envelope makes with the horizontal is called________________?

   A. cohesion
   B. angle of internal friction
   C. angle of repose
   D. none of the above

10. Total number of stress components at a point within a soil mass loaded at its boundary is______________?

    A. 3
    B. 6
    C. 9
    D. 16