ANS:A - to connect water reservoirs at different levels intervened by a hill

Certainly! A siphon can be used to connect water reservoirs at different levels that are intervened by a hill. Here's how it works: Imagine two water reservoirs located at different elevations on either side of a hill. Due to the hill's presence, direct gravity flow from the higher reservoir to the lower one might not be feasible. However, if a siphon is installed, it can effectively transfer water from the higher reservoir, over the hill, and into the lower reservoir. Here's a simplified explanation of how the siphon would function in this scenario:

1. Setup: The siphon consists of a tube that runs from the higher reservoir, up and over the hill, and then down into the lower reservoir. The tube is initially filled with water, and both ends are submerged in the respective reservoirs.
2. Priming: To start the siphon, the tube needs to be primed to remove air and establish a continuous flow of water. This can be done by filling the tube with water and ensuring there are no air pockets along its length.
3. Gravity Flow: Once primed, gravity takes over. The weight of the water in the descending portion of the tube, combined with atmospheric pressure, creates a pressure differential that drives the flow of water through the siphon. The water flows from the higher reservoir, up and over the hill, and down into the lower reservoir.
4. Continuous Flow: As long as the elevation of the water level in the higher reservoir remains above the level in the lower reservoir, and the siphon remains primed and free of air leaks, the flow of water will continue unabated.