McqMate
| Q. |
The wall of a dam is broader at the base |
| A. | because streamlining is required |
| B. | to withstand pressure that increases with depth |
| C. | to withstand pressure that increases in a horizontal plane |
| D. | to withstand pressure that is increased with atmospheric pressure |
| Answer» B. to withstand pressure that increases with depth | |
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Explanation: Darns are built broader at the base for two reasons. The first is because it needs to be stable enough to support the dam, and two, the bottom of the dam needs to be able to deal with the increased pressure of the water, as you get further down. Particular to dams, at the lower part of the structure the lower levels of water are at higher pressure than the upper levels of the water. |
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