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				| 1. | A liquid flowss through two similar pipes 1 and 2. If the ratio of their flow velocities v1 : v2 be 2:3, what will be the ratio of the head loss in the two pipes?$ | 
| A. | 3:2 | 
| B. | 9:4 | 
| C. | 2:3 | 
| D. | 4:9 | 
| Answer» E. | |