Soil Mechanics Chapter 2: Index Properties of Soil – 20 PYQs Quiz with Answers

Soil Mechanics – Chapter 2

Index Properties of Soil | 20 Strictly PYQs | Interactive Quiz

Chapter 2: Index Properties of Soil
20 previous-year questions. प्रत्येक question 1 mark का है. Answer select करने के बाद तुरंत सही/गलत और explanation मिलेगा.

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SSC JE 2004

1. If the soil sample is having porosity 50% and degree of saturation 90%, then its percentage air voids is:

A) 5% B) 50% C) 45% D) 4.5%

Percentage air voids = n(1−S) = 50×0.10 = 5%. इसलिए सही विकल्प A है.

SSC JE 2008

2. The moisture content of soil below which the soil volume becomes constant is called:

A) Liquid limit B) Shrinkage limit C) Plastic limit D) None of these

Shrinkage limit वह water content है जिसके नीचे पानी कम करने पर soil volume में further reduction नहीं होता.

SSC JE 2008

3. A sample of saturated clay has a porosity of 0.562. The void ratio of the clay is:

A) 1.283 B) 0.438 C) 1.779 D) 0.360

e = n/(1−n) = 0.562/0.438 ≈ 1.283. इसलिए 1.283 सही है.

SSC JE 2009

4. The ratio of volume of voids to the total volume of soil mass is called:

A) Air content B) Porosity C) Void ratio D) Air ratio

Porosity n = volume of voids / total volume of soil mass.

SSC JE 2010

5. The moisture content of a soil, below which the soil volume becomes constant, is called:

A) Liquid limit B) Shrinkage limit C) Plastic limit D) None of the above

Volume becomes constant below the shrinkage limit.

SSC JE 2010

6. The ratio of liquid limit to plasticity index for a soil mass is called:

A) Liquidity index B) Shrinkage ratio C) Consistency index D) None of the above

Liquidity index और consistency index के standard expressions में natural water content शामिल होता है; LL/PI इन दोनों की standard definition नहीं है. इसलिए None of the above.

SSC JE 2011

7. Toughness index is defined as the ratio of:

A) Plasticity index to consistency index B) Plasticity index to flow index C) Liquidity index to flow index D) Consistency index to liquidity index

Toughness index It = PI/If, यानी plasticity index divided by flow index.

SSC JE 2011

8. A pycnometer is used to determine:

A) Void ratio and dry density B) Specific gravity and dry density C) Water content and specific gravity D) Void ratio and water content

Pycnometer method can be used for water-content determination and specific-gravity determination when the required measurements are made.

SSC JE 2012

9. If the plasticity index of a soil mass is zero, the soil is:

A) Clay B) Clayey silt C) Sand D) Silt

The cited SSC JE answer key gives sand for this question.

SSC JE 2012

10. Water content of soil can:

A) Be less than 0% B) Be greater than 100% C) Never be greater than 100% D) Take values only from 0% to 100%

Water content is Mw/Ms × 100 and can exceed 100% when the mass of water exceeds the mass of dry solids. Therefore values above 100% are possible.

SSC JE 2013

11. If the volume of voids is equal to the volume of solids in a soil mass, the porosity and void ratio respectively are:

A) 1.0 and 0.0 B) 0.0 and 1.0 C) 0.5 and 1.0 D) 1.0 and 0.5

Vv = Vs gives e = Vv/Vs = 1 and n = Vv/(Vv+Vs) = 1/2 = 0.5.

SSC JE 2014

12. When the plastic limit of a soil is greater than the liquid limit, the plasticity index is reported as:

A) 1 B) Negative C) Zero D) Non-plastic (NP)

जब PL > LL हो, reported plasticity index negative नहीं रखा जाता; इसे zero report किया जाता है.

SSC JE 2014 — 25 May — Shift 2

13. The ratio (Liquid limit − Water content) / Plasticity index for a soil mass is called:

A) Liquidity index B) Shrinkage ratio C) Consistency index D) Toughness index

Consistency index Ic = (LL − w)/PI.

SSC JE 2015

14. When the plasticity index of a soil is zero, the soil is:

A) Clay B) Silt C) Sand D) Silty sand

The cited SSC JE answer key gives sand for this question.

SSC JE 2017

15. Which of the following statements is true?

A) In a dry soil the voids are filled with air B) In a saturated soil all the voids are filled with water C) In a partially saturated soil voids are occupied by both air and water D) All options are correct

All three statements are correct: dry soil has air-filled voids, saturated soil has water-filled voids, and partially saturated soil has both air and water.

SSC JE 2018 — 25 January — Shift 2

16. What would be the void ratio of a soil mass if its porosity is 0.35?

A) 0.26 B) 0.35 C) 0.54 D) 0.60

e = n/(1−n) = 0.35/0.65 = 0.5385 ≈ 0.54.

SSC JE 2018 — 25 January — Shift 2

17. The liquid limit and plastic limit of a soil are 45% and 22% respectively. The plasticity index is:

A) 0.20 B) 0.23 C) 0.50 D) 0.67

PI = LL − PL = 45% − 22% = 23% = 0.23.

SSC JE 22 January 2018 — FN

18. Which of the following represents the void ratio of a soil sample whose porosity is 0.452?

A) 0.264 B) 0.561 C) 0.729 D) 0.825

e = 0.452/(1−0.452) = 0.452/0.548 ≈ 0.825.

SSC JE 22 January 2018 — FN

19. The moisture content of a soil sample is 18.2% and specific gravity of soil particles is 2.65. What is the void ratio if the soil is fully saturated?

A) 0.157 B) 0.291 C) 0.482 D) 0.634

For saturated soil, S=1 and Se=wG. Hence e=wG=0.182×2.65=0.4823≈0.482.

SSC JE 24 January 2018 — AN

20. The maximum dry density and optimum moisture content of a soil are 1.65 g/cc and 20.5%, respectively. What is the percentage of air content at OMC if G = 2.65?

A) 10.4% B) 15.5% C) 26.8% D) 35.7%

Using the three-phase relationship at the stated dry density, OMC and G gives approximately 10.4% air content.

Quiz Complete!

Exam Tip: Index Properties में ये formulas जरूर याद रखें: e = Vv/Vs, n = Vv/V, n = e/(1+e), e = n/(1−n), PI = LL−PL, LI = (w−PL)/PI और Ic = (LL−w)/PI.

Soil Mechanics Chapter 2 – Index Properties of Soil
20 PYQs • Interactive Marks • Civil Engineering Competitive Exams