Pick up the correct statement from the following:

📝 Detailed Explanation

Each of the three statements offered is a standard, textbook-correct definition: void ratio is the ratio of void volume to solids volume; porosity is the ratio of void volume to the gross (total) volume of the soil; and bulk density is simply the unit weight of the soil mass as a whole (including whatever water and air it contains in its natural or as-tested state).

Since all three statements are accurate restatements of definitions covered throughout this topic, the correct choice is (d) All options are correct.

💡 Key Concepts for Students

• Void ratio: V_v/V_s (voids over solids).
• Porosity: V_v/V (voids over gross/total volume).
• Bulk density/unit weight: the overall unit weight of the soil mass as it naturally exists, encompassing solids, water, and air together.
• Questions like this test whether foundational definitions have been memorized precisely enough to recognize each one restated in slightly different wording.