Pick up the correct statement from the following regarding bulking of sand:
Try it first: pick an option, then read the explanation.
Correct answer: D. All options are correct
Detailed Explanation: Three Correct Bulking Statements
Why D (All options correct) is correct:Verification of Each Statement
| Statement | Verdict | Explanation |
|---|---|---|
| A. Bulking caused by thin film of surface moisture | Correct | Thin water films at particle surfaces create surface tension that holds grains apart — the fundamental mechanism of bulking |
| B. Fine sand bulks more than coarse sand | Correct | Fine sand has higher specific surface area → more water film effect per unit volume → greater bulking for the same moisture % |
| C. 10% moisture → 50% bulking | Correct | For very fine sands under certain conditions, bulking can reach up to 50% at peak moisture ranges; textbook value accepted as correct |
- All three statements correctly describe aspects of sand bulking behaviour.
- The fundamental cause: thin moisture film → surface tension → particle separation → volume increase.