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Computational Questions — Soil Science Reviewer Questions

250 board-style Computational Questions items for the Agriculturist Licensure Examination. Try 40 questions free; lifetime access is ₱49. Texture drives water, water drives aeration, and aeration drives nutrient availability. Reason down that chain and most items unlock.

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Sample Computational Questions questions with answers and explanations

Board-style items taken from the Soil Science bank. Every answer is explained, which is the part that makes a review question worth doing twice.

  1. An undisturbed soil core has an oven-dry mass of 164 g and a total core volume of 120 cm³. What is the soil bulk density? Round to two decimals.

    • A. 1.37 g/cm³ correct
    • B. 1.52 g/cm³
    • C. 0.73 g/cm³
    • D. 0.37 g/cm³

    Why: Bulk density = oven-dry soil mass ÷ bulk volume = 164/120 = 1.37 g/cm³.

  2. An undisturbed soil core has an oven-dry mass of 212 g and a total core volume of 150 cm³. What is the soil bulk density? Round to two decimals.

    • A. 1.57 g/cm³
    • B. 1.41 g/cm³ correct
    • C. 0.71 g/cm³
    • D. 0.41 g/cm³

    Why: Bulk density = oven-dry soil mass ÷ bulk volume = 212/150 = 1.41 g/cm³.

  3. An undisturbed soil core has an oven-dry mass of 256 g and a total core volume of 180 cm³. What is the soil bulk density? Round to two decimals.

    • A. 1.58 g/cm³
    • B. 0.70 g/cm³
    • C. 1.42 g/cm³ correct
    • D. 0.42 g/cm³

    Why: Bulk density = oven-dry soil mass ÷ bulk volume = 256/180 = 1.42 g/cm³.

  4. An undisturbed soil core has an oven-dry mass of 198 g and a total core volume of 140 cm³. What is the soil bulk density? Round to two decimals.

    • A. 1.57 g/cm³
    • B. 0.71 g/cm³
    • C. 0.41 g/cm³
    • D. 1.41 g/cm³ correct

    Why: Bulk density = oven-dry soil mass ÷ bulk volume = 198/140 = 1.41 g/cm³.

  5. A cylindrical core sampler has an internal radius of 2.5 cm and height of 5.0 cm. The oven-dry soil mass is 150 g. Using V = πr²h, what is the bulk density? Round to two decimals.

    • A. 1.53 g/cm³ correct
    • B. 1.91 g/cm³
    • C. 0.65 g/cm³
    • D. 0.38 g/cm³

    Why: Core volume = π(2.5)²(5.0) = 98.17 cm³; BD = 150/98.17 = 1.53 g/cm³.

  6. A cylindrical core sampler has an internal radius of 3.0 cm and height of 4.0 cm. The oven-dry soil mass is 185 g. Using V = πr²h, what is the bulk density? Round to two decimals.

    • A. 2.45 g/cm³
    • B. 1.64 g/cm³ correct
    • C. 0.61 g/cm³
    • D. 0.41 g/cm³

    Why: Core volume = π(3.0)²(4.0) = 113.10 cm³; BD = 185/113.10 = 1.64 g/cm³.

  7. A soil has an oven-dry mass of 132.5 g and the volume occupied by the soil solids alone is 50 cm³. What is its particle density?

    • A. 2.21 g/cm³
    • B. 0.38 g/cm³
    • C. 2.65 g/cm³ correct
    • D. 1.65 g/cm³

    Why: Particle density = dry mass ÷ volume of solids = 132.5/50 = 2.65 g/cm³.

  8. A soil has an oven-dry mass of 162 g and the volume occupied by the soil solids alone is 60 cm³. What is its particle density?

    • A. 2.31 g/cm³
    • B. 0.37 g/cm³
    • C. 1.70 g/cm³
    • D. 2.70 g/cm³ correct

    Why: Particle density = dry mass ÷ volume of solids = 162/60 = 2.70 g/cm³.

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