MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
| 1. |
Maximum permissible residual chlorine in treated water should be ____________ mg/litre? |
| A. | 0.001 to 0.01 |
| B. | 0.2 to 0.3 |
| C. | 2 to 3 |
| D. | 5 to 10 |
| Answer» C. 2 to 3 | |