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1) The shear strength of a soil_________________? a. is directly proportional to the angle of internal friction of the soil b. is inversely proportional to the angle of internal friction of the soil c. decreases with increase in normal stress d. decreases with decrease in normal stress
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2) Skempton’s pore pressure coefficient B for saturated soil is________________? a. 1 b. zero c. between 0 and 1 d. greater than 1
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3) In a deposit of normally consolidated clay_________________? a. effective stress increases with depth but water content of soil and un-drained strength decrease with depth b. effective stress and water content increase with depth but undrained strength decreases with depth c. effective stress and undrained strength increase with depth but water content decreases with depth d. effective stress, water content and undrained strength decrease with depth
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4) Unconfmed compressive strength test is________________? a. undrained test b. drained test c. consolidated undrained test d. consolidated drained test
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5) Shear strength of a soil is a unique function of__________________? a. effective stress only b. total stress only c. both effective stress and total stress d. none of the above
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6) 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°
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7) 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°
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8) 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°
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9) 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
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10) Sensitivity of a soil can be defined as___________________? a. percentage of volume change of soil under saturated condition b. ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state c. ratio of volume of voids to volume of solids d. none of the above
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11) 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
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12) During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2, the pore water pressure increases from 0.07 N/mm2 to 0.15 “N/mm2. Skempton’s pore pressure parameter B is___________________? a. 0.5 b. -0.5 c. 2.0 d. – 2.0
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13) 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
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14) 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
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15) Rankine’s theory of earth pressure assumes that the back of the wall is_______________? a. plane and smooth b. plane and rough c. vertical and smooth d. vertical and rough
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16) 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
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17) 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°
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18) Bishop’s method of stability analysis_______________? a. is more conservative b. neglects the effect of forces acting on the sides of the slices c. assumes the slip surface as an arc of a circle d. all of the above
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19) The effect of cohesion on a soil is to______________? a. reduce both the active earth pressure intensity and passive earth pressure intensity b. increase both the active earth pressure intensity and passive earth pressure intensity c. reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity d. increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity
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20) Coefficient of earth pressure at rest is__________________? a. less than active earth pressure but greater than passive earth pressure b. greater than active earth pressure but less than passive earth pressure c. greater than both the active earth pressure and passive earth pressure d. less than both the active and passive earth pressures
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