SSC JE Soil Mechanics objective questions and answers

46. Pneumatic caissons are used where the soil flow into the excavated area of an open caisson is

   A.Faster than it can be removed

   B.Slower than it can be removed

   C.Negligible

   D.Zero

47. The minimum allowable factor of safety against sliding in the case of a cantilever retaining wall is

   A.2.0

   B.3.0

   C.1.50

   D.2.50

48. The formation which contains water but is not able to transmit it is called

   A.An aquifier

   B.An aquiclude

   C.An aquifuge

   D.None of the above

49. Trapezoidal combined footings are required when

   A.The space outside the exterior column is limited

   B.The exterior columns is heavier

   C.Both (a) and (b)

   D.Neither (a) nor (b)

50. The maximum depth of a pneumatic caisson is usually limited to

   A.10 m

   B.20 m

   C.80 m

   D.40 m

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