41. If the sand in-situ is in its densest state, then the relative density of sand is_____________?
A. zero
B. 1
C. between 0 and 1
D. greater than 1
✅ The correct answer is option B.
Soil Mechanics and Foundation Engineering MCQs
42. According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is____________?
A. 0 < PI < 7
B. 7
C. 17
✅ The correct answer is option B.
43. Sand particles are made of________________?
A. rock minerals
B. kaolinite
C. illite
D. montmorillonite
✅ The correct answer is option A.
44. In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as__________________?
A. consolidated drained test
B. consolidated undrained test
C. unconsolidated drained test
D. unconsolidated undrained test
✅ The correct answer is option B.
45. 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
✅ The correct answer is option B.
46. 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°
✅ The correct answer is option B.
47. The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to_______________?
A. 1.0m
B. 1.5 m
C. 2.0 m
D. 3m
✅ The correct answer is option B.
48. Physical properties of a permeant which influence permeability are________________?
A. viscosity only
B. unit weight only
C. both viscosity and unit weight
D. none of the above
✅ The correct answer is option C.
49. Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by________________?
A. 25%
B. 50%
C. 75%
D. 90%
✅ The correct answer is option B.
50. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing_______________?
A. cohesion and effective angle of shearing resistance
B. cohesion and effective unit weight of soil
C. effective unit weight of soil and effective angle of shearing resistance
D. effective angle of shearing resistance
✅ The correct answer is option B.