You can move the level after you take both a foresight and a backsight.

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Multiple Choice

You can move the level after you take both a foresight and a backsight.

Explanation:
In differential leveling, you need both readings to accurately transfer elevations from one point to the next. A backsight gives the instrument’s height relative to the known point you’re leaving, while a foresight records the height of the point you’re moving to. With both, you can compute the exact change in elevation and set up the next position with a correct reference. Moving the level before you’ve taken both readings breaks the measurement chain and introduces errors, since you wouldn’t have the complete data to determine the new elevation.

In differential leveling, you need both readings to accurately transfer elevations from one point to the next. A backsight gives the instrument’s height relative to the known point you’re leaving, while a foresight records the height of the point you’re moving to. With both, you can compute the exact change in elevation and set up the next position with a correct reference. Moving the level before you’ve taken both readings breaks the measurement chain and introduces errors, since you wouldn’t have the complete data to determine the new elevation.

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