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Geotechnical Engineering Quiz 2

\",\"url\":\"https://sonaprep.com/quiz/fe-civil-geotechnical-engineering-quiz-2\",\"timeRequired\":\"PT10M\",\"numberOfQuestions\":10,\"about\":{\"@type\":\"Thing\",\"name\":\"Geotechnical Engineering\"}}"}}],["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"{\"@context\":\"https://schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https://sonaprep.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Quizzes\",\"item\":\"https://sonaprep.com/quiz\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Quiz 2\",\"item\":\"https://sonaprep.com/quiz/fe-civil-geotechnical-engineering-quiz-2\"}]}"}}],["$","div",null,{"className":"bg-[#fdfbf7]","children":["$","div",null,{"className":"mx-auto max-w-[1160px] px-6 py-8 md:py-12","children":[["$","div",null,{"className":"mb-12","children":["$undefined",["$","div",null,{"className":"mb-8","children":["$","h1",null,{"className":"font-display mb-4 text-4xl font-semibold text-[#2c3c5e] md:text-5xl lg:text-6xl","children":"Quiz 2"}]}],["$","div",null,{"className":"rounded-[10px] border border-[#eae2d2] bg-white p-6 shadow-[0_2px_10px_rgba(44,60,94,0.04)] md:p-8","children":[["$","div",null,{"className":"prose prose-lg mb-8 max-w-none text-lg leading-relaxed text-[#6b7180] md:text-xl","dangerouslySetInnerHTML":{"__html":"

Geotechnical Engineering Quiz 2

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Geotechnical Engineering Quiz 2

"},"excerpt":{"rendered":"

Geotechnical Engineering Quiz 2

"},"featured_media":0,"featured_media_url":"$undefined","acf":{"duree_estimee":10,"niveau_difficulte":"$undefined","categorie":"Geotechnical Engineering","nombre_questions":10,"score_minimum":70,"ordre_questions":"Fixe","questions":[{"id":"cmnxib7ka0000l5041tlbqfh8","texte_question":"

In a specific gravity test using a pycnometer, the mass of oven-dried soil is $$150\\ \\mathrm{g}$$, the mass of the pycnometer filled with water is $$650\\ \\mathrm{g}$$, and the mass of the pycnometer with soil and water is $$745\\ \\mathrm{g}$$. Determine the specific gravity of the soil solids.

","type_question":"QCM","explication":"

Use the pycnometer relation:

$$G_s=\\frac{W_s}{W_s+W_{pw}-W_{psw}}$$

Substitute:

$$G_s=\\frac{150}{150+650-745}$$

$$G_s=\\frac{150}{55}$$

$$G_s=2.73$$

Final answer: $$2.73$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"2.73","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"

2.65

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

2.45

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

2.58

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7ka0005l5045lxr62fc","texte_question":"

A soil sample is taken from the field for water content determination. The mass of the wet soil sample is $$185.4\\ \\mathrm{g}$$ and the mass after oven-drying is $$156.2\\ \\mathrm{g}$$. Determine the water content of the soil.

","type_question":"QCM","explication":"

Water content:

$$w=\\frac{W_w}{W_s}\\times100$$

Water mass:

$$W_w=185.4-156.2$$

$$W_w=29.2$$

$$w=\\frac{29.2}{156.2}\\times100$$

$$w=18.7\\%$$

Final answer: $$18.7\\%$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

15.7%

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

20.6%

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

84.3%

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

18.7%

","correcte":true,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000al504co40wguh","texte_question":"

A sand deposit has a maximum void ratio of $$0.92$$ and a minimum void ratio of $$0.48$$. The in-situ void ratio is $$0.65$$. Calculate the relative density of the sand.

","type_question":"QCM","explication":"

Relative density:

$$D_r=\\frac{e_{max}-e}{e_{max}-e_{min}}\\times100$$

$$D_r=\\frac{0.92-0.65}{0.92-0.48}\\times100$$

$$D_r=61.4\\%$$

Final answer: $$61.4\\%$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

38.6%

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

70.7%

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

61.4%

","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"

29.3%

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000fl504bjxwhzf6","texte_question":"

A clay soil has a natural water content of $$32\\%$$, liquid limit $$45\\%$$, and plastic limit $$22\\%$$. Calculate the liquidity index.

","type_question":"QCM","explication":"

Liquidity index:

$$LI=\\frac{w-PL}{LL-PL}$$

$$LI=\\frac{32-22}{45-22}$$

$$LI=0.43$$

Final answer: $$0.43$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"0.57","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

0.43

","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"

0.71

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

-0.57

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000kl50406tvvqio","texte_question":"

A soil sample has $$35\\%$$ passing No.200 sieve, $$85\\%$$ passing No.4 sieve, liquid limit $$42\\%$$, plastic limit $$25\\%$$. Classify using USCS.

","type_question":"QCM","explication":"

Plasticity index:

$$PI=42-25=17$$

A line:

$$PI_A=0.73(42-20)=16.06$$

Since:

$$PI$$>$$PI_A$$

Clayey fines.

Classification: $$SC$$

Final answer: $$SC$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"SM","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

SW-SC

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

","correcte":true,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000pl504h51y848z","texte_question":"

A non-cohesive sand with $$8\\%$$ fines, $$C_u=8$$ and $$C_c=2.5$$. Classify using USCS.

","type_question":"QCM","explication":"

Well graded sand: $$C_u≥6$$ $$1≤C_c≤3$$ Fines between $$5\\%-12\\%$$ Dual classification: $$SW-SM$$ Final answer: $$SW-SM$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"SW","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

SW-SM

","correcte":true,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000ul504cgd9xke2","texte_question":"

34% of soil sample passes through No.200 sieve. The soil liquid limit is $$39$$ and plastic limit is $$29$$. What is the AASHTO classification for this soil?

","type_question":"QCM","explication":"

Compute plasticity index:

$$PI = LL - PL$$

$$PI = 39 - 29 = 10$$

Since:

$$F_{200} = 34\\%$$ < $$35\\%$$

So, soil belongs to A-2 group.

Check subgroup:

$$LL$$ < $$40$$

$$PI \\le 10$$

Classification: $$A-2-4$$

Final answer: $$A-2-4$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

A-2-4

","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"A-2-5","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

A-5

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

A-6

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kb000zl5049zg7exqp","texte_question":"$16","type_question":"QCM","explication":"

Above groundwater:

$$\\sigma_1 = 2(132) = 264\\ psf$$

Submerged sand:

$$\\gamma_{sub} = 132 - 62.4 = 69.6$$

$$\\sigma_2 = 3(69.6) = 208.8$$

Submerged clay:

$$\\gamma_{sub} = 126 - 62.4 = 63.6$$

$$\\sigma_3 = 10(63.6) = 636$$

Total effective stress: $$\\sigma = 264 + 208.8 + 636$$ $$\\sigma = 1108.8$$ Final answer: $$1100\\ psf$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

800 psf

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"1100 psf","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"

1400 psf

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

1700 psf

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kc0014l504e9e2zh0x","texte_question":"

A retaining wall is 12 ft high. Backfill density is $$120\\ pcf$$. Saturated below 5 ft. Friction angle $$30^\\circ$$. Determine resultant active force.

","type_question":"QCM","explication":"

Rankine coefficient:

$$K_a = \\frac{1-\\sin30}{1+\\sin30}$$

$$K_a = 0.333$$

Dry portion:

$$P_1 = 0.5(0.333)(120)(5^2)$$

$$P_1 = 500$$

Submerged unit weight:

$$\\gamma_{sub} = 120 - 62.4 = 57.6$$

Lower portion:

$$P_2 = 0.5(0.333)(57.6)(7^2)$$

$$P_2 = 1380$$

Water pressure:

$$P_w = 0.5(62.4)(7^2)$$

$$P_w = 1528.8$$

Total force:

$$P = 500 + 1380 + 1528.8$$

$$P = 3880$$

Final answer: $$3880\\ lbs$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

2880 lbs

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

3880 lbs

","correcte":true,"explication":"","imageUrl":"$undefined"},{"texte":"

4880 lbs

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

8880 lbs

","correcte":false,"explication":"","imageUrl":"$undefined"}]},{"id":"cmnxib7kc0019l504ui2gsu5p","texte_question":"

A retaining wall 12 ft high with saturated soil below 5 ft. Determine overturning moment.

","type_question":"QCM","explication":"

Resultant force:

$$P = 3880$$

Moment arm:

$$H/3 = 12/3 = 4$$

Overturning moment:

$$M = 3880(4)$$

$$M = 15520$$

Final answer: $$15520\\ lb.ft$$

","points":1,"temps_limite":"$undefined","reponses":[{"texte":"

5000 lb.ft

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

8000 lb.ft

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

11000 lb.ft

","correcte":false,"explication":"","imageUrl":"$undefined"},{"texte":"

15520 lb.ft

","correcte":true,"explication":"","imageUrl":"$undefined"}]}]},"categories":["Geotechnical-Engineering"],"date":"2026-04-12T09:01:30.340Z","modified":"2026-04-13T18:09:03.753Z"}}]]}]}]]