Void Ratio MCQ – Geotechnical Engineering

41. Relationship between dry density γd,  percentage of air voids na, water content w and specific gravity G of any soil is

$\\a.\; \gamma_{d}=\frac{1+n_{a}}{1+wG}\\ b.\; \gamma_{d}=\frac{(1+n_{a})G\gamma_{w}}{1-wG}\\ c.\; \gamma_{d}=\frac{(1-n_{a})G\gamma_{w}}{1+wG}\\ d.\; \gamma_{d}=\frac{(1-n_{a})G\gamma_{w}}{1-wG}\\$

Answer
Answer. b

42. The clay sample has a void ratio of 0.50 in dry state and specific gravity of solid 2.70. Its shrinkage limit will be

  1. 13.5%
  2. 12%
  3. 22%
  4. 18.5%
Answer
Answer. d

43. In Geotechnical Engineering, void ratio is defined as ratio of

  1. volume of voids of water/volume of water
  2. volume of voids/mass of voids
  3. volume of voids/volume of solids
  4. volume of solids/volume of solids
Answer
Answer. c

44. The specific gravity of solids in a soil sample is 2.75, and the void ratio is 1.0. If the value of γw is 10 kN/m3, the value of dry unit weight of soil is

  1. 11.85 kN/m3
  2. 13.75 kN/m3
  3. 15.65 kN/m3
  4. 17.55 kN/m3
Answer
Answer. b

45. Void ratios of the densest, loosest and the natural states of a sand deposit are 0.2, 0.6 and 0.4 respectively. The relative density of the deposit is

  1. 100%
  2. 75%%
  3. 50%
  4. 25%
Answer
Answer. c

46. How many cubic metres of soil having void ratio of 0.7 can be made from 30m3 of soil with void ratio of 1.2?

  1. 30.0 m3
  2. 36.6 m3
  3. 25.9 m3
  4. 23.2 m3
Answer
Answer. d

47. The ratio of volume of air voids to the volume of voids is called

  1. Void density
  2. Air content
  3. Porosity
  4. Permeability
Answer
Answer. b

48. A soil sample of specific gravity 2.65 has a void ratio of 0.8. The water content in percentage required to saturate the soil is

  1. 40
  2. 30
  3. 20
  4. 10
Answer
Answer. b

49. In soil, the value of which of the following can be more than 100%?

  1. Air Content
  2. Water Content
  3. Void Ratio
  4. Porosity
  1. Only (i)
  2. (i) and (ii)
  3. (ii) and (iii)
  4. (ii), (iii) and (iv)
Answer
Answer. c

50. A cube of soil specimen having dimensions 2 cm x 2 cm x 2 cm weighs 16 gm when it is fully saturated. If void ratio of the specimen is 1.0, the dry density of the specimen will be

  1. 2000 kg/m3
  2. 1500 kg/m3
  3. 1200 kg/m3
  4. 1600 kg/m3
Answer
Answer. b
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