Civil Engineering MCQJE Level Civil Engineering
For a dry cohesionless soil with unit weight 18 kN/m³, φ=30°, and wall height 5m, the total active earth pressure (Rankine) per metre length is:
Soil MechanicsEarth PressureMEDIUM
Choose the correct answer
A
75 kN/m
B
135 kN/m
C
45 kN/m
D
90 kN/m
Correct Answer
A. 75 kN/m
Why is this the answer?
Ka=tan²(45−φ/2)=tan²(30°)=(0.577)²=0.333. Pa=½×Ka×γ×H²=½×0.333×18×25=75 kN/m. Acts at H/3=1.67m from base.
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This MCQ belongs to Magic Mock Test Series — SSC JE Civil (Paper II). Full tests include timed attempts, rank comparison and subject-wise analysis.