PSAD

A. Liquefaction

It occurs in soils of saturated cohesionless particles such as sand and causes a sudden drop in shear strength and its bearing capacity. In effect, the soil turns into a liquid allowing everything it previously supported to sink.

A. Liquefaction

B. Runoff

C. Liquid Limit

D. Floatation

C. Decreases

If the ground water table in a soil formation rises as a result of flooding, the bearing capacity of the soil.

A. Increases

B. Unaffected

C. Decreases

D. Depends on the footing load

B. Load imposed into the soil

One of the following foundation conditions does not affect the bearing capacity of the supporting soil.

A. Unit weight of the soil

B. Load imposed into the soil

C. Depth of founding of footings

D. Position of ground water table

D. Sand

In accordance with the Unified Soils Classification System, a soil grain having a size greater than No. 200 sieve opening (0.074 mm) but less than that of a No. 4 sieve (4.75 mm opening) is called:

A. Gravel

B. Pebble

C. Cobble

D. Sand

B. 10 to 30

A granular soil deposit is considered medium dese if the blow count of a standard penetration test is between:

A. Over 50

B. 10 to 30

C. 30 to 50

D. 4 to 10

D. Practically impermeable

Which of the following is NOT a characteristic of a cohesionless soil?

A. Easy to compact

B. High shear strength

C. Prone to settlement due to vibrating load

D. Practically impermeable

A. Porosity

The ratio of the volume of voids to the total volume of soil.

A. Porosity

B. Void ratio

C. Degree of saturation

D. Water content

B. 40

Atterberg limit tests is done on aggregates that pass through what sieve size?

A. 20

B. 40

C. 60

D. 30

D. 1 to 2

According to NSCP, cut and fill slopes must not be steeper than:

A. 1 to 3

B. 1 to 1

C. 1 to 5

D. 1 to 2

A. Possess low shear strength

Which of the following is NOT a characteristic of cohesive soil?

A. Possess low shear strength

B. Practically permeable

C. Plastic and compressible

D. Decrease shear strength when disturbed

A. 0.074 mm

What is the largest grain size that may pass through a No. 200 sieve?

A. 0.074 mm

B. 0.020 mm

C. 0.054 mm

D. 0.060 mm

D. Compressibility

 

Which of the following property of soil is necessary in the design of footing?

A. Permeability

B. Plasticity index

C. Atterberg limits

D. Compressibility

B. Liquid limit

Water content corresponding to the limit between the liquid and plastic states of consistency of a soil?

A. Atterberg limit

B. Liquid limit

C. Moisture limit

D. Plastic limit

A. 60% of the soil is finer than this size

In the soil classification system, D60 of the soil is the particle size such that:

A. 60% of the soil is finer than this size

B. 60 % of the soil is larger than this size

C. 60% of the soil passes sieve No. 200

D. 60% of the soil is coarse grained materials

C. The numerical difference between the liquid limits and the plastic limits

Plasticity index is:

A. Inversely proportional to the ease with which water passes through the soil

B. A measure of the range of moisture contents through which the soil is plastic

C. The numerical difference between the liquid limits and the plastic limits

D. All of the above