Civil Engineering MCQs

Page No. 242

Rankine’s theory of earth pressure assumes that the back of the wall is_______________?


aplane and smooth


b plane and rough


c vertical and smooth


dvertical and rough



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


acohesion


bangle of internal friction


cangle of repose


dnone of the above



In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on__________________?


ahorizontal plane only


b vertical plane only


c both horizontal and vertical planes


d all planes except horizontal and vertical planes



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


c2.0


d – 2.0


View Answer 0.5

Sensitivity of a soil can be defined as___________________?


apercentage of volume change of soil under saturated condition


bratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state


cratio of volume of voids to volume of solids


dnone of the above



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__________________?


aconsolidated drained test


bconsolidated undrained test


c unconsolidated drained test


dunconsolidated undrained test



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


a45°


b 90°


c135°


d225°


View Answer 90°

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


a90°


b45°


c22.5°


d


View Answer 45°

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______________________?


a0.5 N/mm2 and 30°


b0.05 N/mm2 and 0°


c 0.2 N/mm2 and 0°


d 0.05 N/mm2 and 45°


View Answer 0.2 N/mm2 and 0°

Shear strength of a soil is a unique function of__________________?


aeffective stress only


b total stress only


cboth effective stress and total stress


dnone of the above


View Answer effective stress only

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