The minimum size of the particles of silt soil is

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APSC JE Civil 14 Jul 2024 Official Paper
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  1. 0.002 mm
  2. 0.05 mm
  3. 0.06 mm
  4. 0.08 mm

Answer (Detailed Solution Below)

Option 1 : 0.002 mm
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Explanation:

Minimum Size of Silt Soil Particles

The minimum size of silt soil particles is determined based on the soil classification systems commonly used in engineering and geotechnical studies. These systems define particle sizes as follows:

  • Clay particles: Less than 0.002 mm.

  • Silt particles: Between 0.002 mm and 0.05 mm.

  • Sand particles: Between 0.05 mm and 2 mm.

Analyzing the Given Options

  1. Option 1: 0.002 mm (Correct Answer)

    • Silt particles begin at 0.002 mm, making this the correct minimum size.

  2. Option 2: 0.05 mm (Incorrect)

    • 0.05 mm is the upper limit for silt particle size, not the minimum.

  3. Option 3: 0.06 mm (Incorrect)

    • 0.06 mm falls within the sand particle size range, not silt.

  4. Option 4: 0.08 mm (Incorrect)

    • 0.08 mm is too large to be classified as silt.

  5. Option 5: (Not Applicable)

    • No valid answer is provided for this option.

Conclusion:

The correct answer is Option 1: 0.002 mm, as this is the minimum size of silt soil particles according to standard soil classification systems.

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