Question

The size of coarse sand ranges between:

• A. 20 mm and 80 mm
• B. 4.75 mm and 20 mm
• C. 2.0 mm and 4.75 mm
• D. 0.425 mm to 2.0 mm

Hint:

Memorize sand size ranges: coarse = 2.0–4.75 mm; above that is gravel, below is fine/medium sand.

Answer 1

The Correct Option is C

To determine the correct size range for coarse sand, we analyze the given options based on standard soil classification systems (e.g., IS, USCS, or ASTM).

1. Understanding Sand Classification:
Sand is classified by particle size, with coarse sand representing larger particles within the sand category. Standard classifications define the ranges as follows:
- Coarse sand: 2.0 mm to 4.75 mm
- Medium sand: 0.425 mm to 2.0 mm
- Fine sand: 0.075 mm to 0.425 mm

2. Evaluating the Options:
- Option 1 (20 mm to 80 mm): Gravel range (not sand).
- Option 2 (4.75 mm to 20 mm): Very coarse sand or gravel (borderline).
- Option 3 (2.0 mm to 4.75 mm): Correct coarse sand range.
- Option 4 (0.425 mm to 2.0 mm): Medium sand range.

3. Conclusion:
Only Option 3 (2.0 mm to 4.75 mm) matches the standard definition of coarse sand.

Final Answer:
The correct size range is \( \boxed{2.0\ \text{mm}\ \text{to}\ 4.75\ \text{mm}} \).