## Earth Pressure Theories – MCQ

**1. Depth of tensile zone near the surface of a cohesive fill is –**

**a)** [latex] (c/\gamma )/ N\phi [/latex]

**b)** [latex] (\gamma/c )/ N\phi [/latex]

**c)** [latex] (2c/\gamma )/ N\phi [/latex] âœ…

**d)** [latex] (2c/\gamma )/ (1/ N\phi) [/latex]

**2. A verticle cut in clay soil with unit weight of 19 KN/m ^{3} failed when the depth of cut was 4.8 m. What is the cohesive strength of clay?**

**a)** 22 KN/m^{2}

**b)** 20 KN/m^{2}

**c)** 21 KN/m^{2}

**d)** 23 KN/m^{2} âœ…

[**Note:** Formula, [latex] H_{c} = 4c/\gamma [/latex] Where, H = 4.8m, c = cohesive strength of clay, and [latex] \gamma [/latex] = 19 KN/m^{3} ]

**3. Which Assumption is true for the Rankine Earth pressure Theory –**

**a)** The soil mass is dry and cohesionless

**b)** The soil mass is semi-infinite and homogeneous

**c)** The back of the wall is verticle and smooth

**d)** All of These âœ…

**4. The lateral earth pressure coefficient K _{p} and K_{a} refers to**

**a)** Total stree

**b)** Natural Stress

**c)** Effective Stress âœ…

**d)** All of these

**e)** None of these

**5. A verticle cut in soft clay be excavated without any lateral support up to a depth of **

**a)** [latex] 2c/\gamma [/latex]

**b)** [latex] 2c\sqrt{N_{\phi }}/\gamma [/latex]

**c)** [latex] 4c\sqrt{N_{\phi }}/\gamma [/latex]

**d)** [latex] 4c/\gamma [/latex] âœ…

**6. Which condition fulfil the Coefficient of earth pressure at rest –**

**a)** Greater than active earth pressure

**b)** Less than the Active earth pressure

**c)** Greater than the passive earth pressure

**d)** Less than the passive earth pressure

**e)** (a) but (d) âœ…

**f)** (b) but (c)

**7. According to Rankine’s theory the value of ‘c’ for cohesionless soil is **

**a)** 1

**b)** 0 âœ…

**c)** 1/2

**d)** Non of These

**8. Which Assumption is true for Coulomb’s Wedge Theory**

**a)** The backfill is dry, cohesionless, homogenous

**b)** The backfill is elastically undeformable

**c)** All of These âœ…

**d)** None of These

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