Which of the following statements is true?
Try it first: pick an option, then read the explanation.
Correct answer: D. All options are correct
Detailed Explanation
Each statement restates a definition already established earlier in this topic:
- In dry soil, all voids are filled with air (no water) — consistent with Q40.
- In saturated soil, all voids are filled with water (no air) — consistent with Q2 and Q33.
- In partially saturated soil, voids are shared between air and water, alongside the solid particles — the general, most commonly occurring case.
All three statements are correct, so the answer is (d) All options are correct.
Key Concepts for Students
- Dry, saturated, and partially saturated states together describe every possible condition of the void space in a soil mass.
- Only the partially saturated state contains all three phases (solid, water, and air) simultaneously.
- Recognizing which single state (S=0, S=1, or 0
- These three states form the conceptual backbone that later formulas (eS = wG, γsat, γd, γsub) are all built around.