A phreatic line is defined as the line within a dam section below which there ar

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Question
A phreatic line is defined as the line within a dam section below which there are
Options
A. positive equipotential lines
B. positive hydrostatic pressure
C. negative hydrostatic pressure
D. negative equipotential lines
E. none of these.

Correct Answer

positive hydrostatic pressure

Soil Mechanics and Foundation Engineering problems

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3. The critical exist gradient of seepage water in soils, is
Options
A. directly proportional to the voids ratio
B. inversely proportional to the specific gravity
C. directly proportional to the specific gravity
D. inversely proportional to the voids ratio
E. none of these.

4. The direct shear test suffers from the following disadvantage:
Options
A. Drain condition cannot be controlled
B. Pore water pressure cannot be measured
C. Shear stress on the failure plane is not uniform.
D. The area under the shear and vertical loads does not remain constant throughout the test
E. All the above.

6. The compressibility of clays, is caused due to:
Options
A. expulsion of double layer water from in between the grains
B. sliping of particles to new positions of greater density
C. bending of particles as elastic sheets
D. all the above.

7. Pick up the correct statement from the following :
Options
A. To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants
B. To a geologist, soil is the material in a relatively thin surface zone within which roots occur, and rest of the crust is termed as rock irrespective of hardness
C. To an engineer, soil is the unaggregated and uncemented deposits of minerals and organic particles covering the earth's crust
D. All the above.

8. For determing the specific gravity of soil solids, using a pycnometer of 500 cc., the following data is available : Weight of dry empty pycnometer = 125 g Weight of dried soil and pycnometer = 500 g Weight of dried soil and distilled = 850 g water filled in pycnometer up to top The specific gravity of soil soilds, is
Options
A. 2.0
B. 2.25
C. 2.50
D. 2.75

10. For a homogeneous earth dam 50 m high having 2 m free broad, a flow net was constructed and the results were : Number of potential drops = 2.4 Number of flow channels = 0.4. If coefficiency of permeability of the dam mateiral is 3 x 10^-3 cm³/sec, the discharge per metre length of dam, is
Options
A. 12 x 10^-5 m³/sec
B. 24 x 10^-3 m³/sec
C. 6 x 10^-5 m³/sec
D. 24 x 10^-5 m³/sec

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