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

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. If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is__________________?

   A. 90°
   B. 45°
   C. 22.5°
   D. 0°

4. 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

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

   A. 45°
   B. 90°
   C. 135°
   D. 225°

6. Relative density of a compacted dense sand is approximately equal to_____________?

   A. 0.4
   B. 0.6
   C. 0.95
   D. 1.20

7. Toughness index is defined as the ratio of____________________?

   A. plasticity index to consistency index
   B. plasticity index to flow index
   C. liquidity index to flow index
   D. consistency index to liquidity index

8. Rise of water table above the ground surface causes________________?

   A. equal increase in pore water pressure and total stress
   B. equal decrease in pore water pressure and total stress
   C. increase in pore water pressure but decrease in total stress
   D. decrease in pore water pressure but increase in total stress

9. The most suitable method for drainage of fine grained cohesive soils is________________?

   A. well ppint system
   B. vacuum method
   C. deep well system
   D. electroosmosis method

10. 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