REVIEW INNOVATIONS

NOVEMBER 2023 CE BOARD EXAM REFRESHER GEO 4

INSTRUCTION: Select the correct answer for 5. Which of the following most nearly
each of the following questions. Mark only gives the interstitial velocity of the
one answer for each item by shading the box flow?
corresponding to the letter of your choice A. 0.04 m/day C. 0.15 m/day
on the answer sheet provided. STRICTLY NO B. 0.16 m/day D. 0.59 m/day
ERASURES ALLOWED. GOOD LUCK. 6. Which of the following most nearly
gives the time of travel from the head
NOTE: A times B is represented by A×B or of the aquifer to a point 4 km
A*B. A raised to the power n is downstream?
expressed as A^n. All problems are 1 A. 3318 days C. 5656 days
point each. B. 6750 days D. 4422 days

Situation 1. A footing 2 m x 3 m in plan Situation 3. The following table shows an

and 0.50 m thick is designed to support approximate correlation between the
a 0.60 m square column. Due to standard penetration test (SPT) and
architectural reasons, the column is the unconfined compression strength of
located that its external face is cohesive soils.
flush with the shorter edge of the
footing. The column, however, is Consistency SPT Unconfined compressive
located along the minor principal axis Blows strength (kPa)
of the footing. The column load, Very Soft 0 - 2 0 - 25
including the weight of the column Soft 2 - 4 25 - 50
itself is 50 kN. Assume concrete to Medium 4 - 8 50 - 100
weigh 24 kN/m^3. Stiff 8 - 16 100 - 200
Very Stiff 16 - 32 200 - 400
1. Evaluate the total downward load on
supporting ground. 7. For an SPT of 5 blows, determine the
A. 142 kN C. 132 kN approximate unconfined compression
B. 112 kN D. 122 kN strength of the clay.
2. Evaluate the maximum pressure induced A. 31.3 kPa C. 50.0 kPa
on the ground. B. 25.0 kPa D. 62.5 kPa
A. 40.3 kPa C. 43.0 kPa 8. For an SPT of 14 blows, determine the
B. 30.4 kPa D. 34.0 kPa approximate cohesion of the clay.
3. Evauate the minimum pressure induced A. 175 kPa C. 100 kPa
on the ground. B. 200 kPa D. 88 kPa
A. 0.33 kPa C. 0.22 kPa 9. For a soil with cohesion 78 kPa,
B. 0.44 kPa D. 0.11 kPa determine the consistency.
A. Soft C. Medium
Situation 2. A confined aquifer has a B. Stiff D. Very Stiff
hydraulic conductivity of 40 m/day and
a porosity of 25%. The piezometric Situation 4. Two footings rest in a layer
surface in two observation wells are of sand 2.7 m thick. The bottom of the
at elevation 65 m and 60 m, footings are 0.90 m below the ground
respectively from the common datum. surface. Beneath the sand layer is a
The first and second observation well 1.8 – m thick clay layer. Underneath
are 3.65 km and 5 km from the source the clay layer is solid rock. Water
of recharge respectively. The aquifer table is at a depth of 1.8 m below the
has an average thickness of 25 m and ground surface.
average width of 4 km.

4. Which of the following most nearly

gives the flow rate of water through 10. Compute the stress increase in kPa
the aquifer? below the footing A (1.5 m x 1.5 m) at
A. 18441.4 m3/day C. 14814.8 m3/day the center of the clay layer.
B. 11844.1 m3/day D. 14841.4 m3/day A. 20.15 C. 22.50
B. 30.75 D. 25.51
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NOVEMBER 2023 CE BOARD EXAM REFRESHER GEO 4
11. Determine the size of footing B so that 22. Residual soils are formed by
the settlement in the clay layer is A. Glaciers
the same beneath footings A and B. B. Wind
A. 2.85 x 2.85 C. 1.80 x 1.80 C. Water
B. 3.24 x 3.24 D. 3.68 x 3.68 D. None of the above
12. Determine the settlement in mm beneath
footing A. 23. Textural classifications are merely
A. 34.70 C. 58.10 based on:
B. 30.85 D. 46.65 A. Grain size
B. Consistency limits
13. A cohesionless soil is considered C. Grain size and consistency
dense if the SPT “N” value is between limits
A. 0 to 4 C. 30 to 50 D. Plasticity index
B. 10 to 30 D. 4 to 10
24. The minimum number of observation
14. A cohesionless soil is considered wells required to determine the
loose if the SPT “N” value is between permeability of a stratum in the field
A. 0 to 4 C. 30 to 50 by a pumping test is:
B. 10 to 30 D. 4 to 10 A. One
B. Two
15. A cohesionless soil is considered very C. Three
loose if the SPT “N” value is between D. None of the above
A. 0 to 4 C. 30 to 50
B. 10 to 30 D. 4 to 10 25. Consolidation is a fuction of..
A. Function of the total stress.
16. Soil grains with particle size greater B. Function of the neutral stress.
than 4.75 mm but less than 75 mm C. Function of the effective
according to USCS. stress.
A. Cobbles C. Boulder D. Does not depend upon the present
B. Gravel D. Sand stress.

17. Soil grains with particle size is 26. Allowable bearing pressure for a
greater than 75 mm according to USCS. foundation depends upon:
A. Cobbles C. Boulder A. Allowable settlement only
B. Gravel D. Sand B. Ultimate bearing capacity of
soil only
18. The maximum shear stress occurs on the C. Both allowable settlement and
filament which makes an angle with the ultimate bearing capacity
horizontal plane equal to: D. None of the above
A. 30° C. 60°
B. 45° D. 90° 27. The over consolidation ratio (OCR) of
an over consolidated soil is:
19. A practice of procedure used to asses A. Less than 1
the particle size distribution (also B. Equal to 1
called gradation) of a granular C. Greater than 1
material. The size distribution is D. None of the above
often of critical importance to the
way the material performs in use. 28. The over consolidation ratio (OCR) of
A. Consolidation test a normally consolidated soil is:
B. Standard penetration test A. Less than 1
C. Unconfined compression test B. Equal to 1
D. Sieve Analysis C. Greater than 1
D. None of the above
20. The average/equivalent coefficient of
permeability of natural deposits 29. Pick up the correct statement from the
A. Parallel to stratification is following:
always greater than that A. Failure plane carries maximum
perpendicular to stratification shear stress
B. Parallel to stratification is B. Failure plane does not carry
always less than that maximum shear stress
perpendicular to stratification C. Failure plane carries shear
C. Is always same in both stress equal to maximum shear
directions stress
D. Parallel to stratification may D. None of these
or may not be greater than that
perpendicular to stratification 30. At liquid limit a soil has
A. No shearing strength
21. Transporting and re-depositing soils, B. Negligible or very small shear
is done by strength
A. Water C. High shearing strength
B. Glacier D. Nothing to do with shearing
C. Gravity strength.
D. All the above
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