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| Q. |
What is the minimum diameter of pipes used for drainage of waste water? |
| A. | 50 mm |
| B. | 75 mm |
| C. | 100 mm |
| D. | 105 mm |
| Answer» B. 75 mm | |
| Explanation: waste water is from showers, basins, kitchen sinks, washing machines and the like. this is also called grey water. | |
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