Soil Mechanics and Foundation
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

12°
17°
10°
7°

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Soil Mechanics and Foundation
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

0.2 N/mm² and 0°
0.5 N/mm² and 30°
0.05 N/mm² and 0°
0.05 N/mm² and 45°

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible
Stress distribution on the failure plane, is non uniform
None of these

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