Carpenter Red Seal Exam Prep · Question
A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m and 124.5 m, what is the approximate slope between these two lines if they are measured to be 10 m apart horizontally?
The change in elevation is 0.5 m (124.5 m - 124.0 m). The horizontal distance is 10 m. The slope ratio is vertical change divided by horizontal distance, or 0.5
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Question: A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m and 124.5 m, what is the approximate slope between these two lines if they are measured to be 10 m apart horizontally?
Answer options: ✅ 1:20
- 1:5
- 1:10
- 1:2
Correct answer: 1:20
Explanation: The change in elevation is 0.5 m (124.5 m - 124.0 m). The horizontal distance is 10 m. The slope ratio is vertical change divided by horizontal distance, or 0.5 m / 10 m = 1/20. Thus, the slope is 1:20.
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