Porosity MCQ – Geotechnical Engineering

16. A soil sample has a void ratio of 0.50. Its porosity will be close to

  1. 25%
  2. 33%
  3. 66%
  4. 75%
Answer
Answer. b

17. A dry soil sample has equal amounts of solids and void, by volume. Its voids ratio and porosity will be

Voids ratio Porosity
a. 1.0 50%
b. 0.5 100%
c. 0.5 50%
d. 1.0 100%
Answer
Answer. a

18. If the void ratio (e) of a given soil sample is 0.77 then the porosity (n) is

  1. 0.435%
  2. 43.50%
  3. 23.3%
  4. Data given are insufficient to calculate porosity
Answer
Answer. b

19. A soil sample has a shrinkage limit of 20% and specific gravity of soil solids is 2.7. The porosity of the soil at shrinkage limit is

  1. 0.35
  2. 0.25
  3. 0.55
  4. 0.45
Answer
Answer. a

20. The ratio of volume of voids (Vv) in the soil to its total volume (V) is defined as

  1. Porosity
  2. Void ratio
  3. Degree of saturation
  4. Mass density
Answer
Answer. a

21. A soil sample has a shrinkage limit of 10% and specific gravity of soil solids as 2.7. The porosity of the soil at shrinkage limit is

  1. 30%
  2. 21.2%
  3. 70%
  4. 52.7%
Answer
Answer. b

22. A soil sample has a porosity of 30 percent. Calculate the void ratio.

  1. 0.11
  2. 1.3
  3. 0.428
  4. 0.947
Answer
Answer. c

23. A soil sample has a porosity of 40%. The specific gravity of solid particles is 2.70. The dry density of the soil will be

  1. 1.82 gm/cc
  2. 1.25 gm/cc
  3. 1.62 gm/cc
  4. 1.37 gm/cc
Answer
Answer. c

24. A soil sample has a porosity of 40%, and the specific gravity of solid is 2.70. If the soil is 50% saturated, the unit weight will be nearly

  1. 22 kN/m3
  2. 20 kN/m3
  3. 18 kN/m3
  4. 16 kN/m3
Answer
Answer. c

25. Specific gravity of the soil particles is needed in determining

  1. void ratio
  2. porosity and degree of saturation
  3. particle size distribution
  4. all of these
Answer
Answer. d
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