Carpenter Red Seal Exam Prep · Question
A road grade is specified as a constant slope of 0.5% (fall). If a grade stake at chainage 0+000 (0 metres) has a design elevation of 100.000 m, what is the design elevation at a grade stake located 150 metres away (chainage 0+150)?
A 0.5% fall over 150 m means a change in elevation of 0.005 (slope conversion) × 150 m = 0.750 m. Since it's a fall, the elevation decreases: 100.000 m - 0.750
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Question: A road grade is specified as a constant slope of 0.5% (fall). If a grade stake at chainage 0+000 (0 metres) has a design elevation of 100.000 m, what is the design elevation at a grade stake located 150 metres away (chainage 0+150)?
Answer options: ✅ 99.250 m
- 100.750 m
- 99.500 m
- 100.500 m
Correct answer: 99.250 m
Explanation: A 0.5% fall over 150 m means a change in elevation of 0.005 (slope conversion) × 150 m = 0.750 m. Since it's a fall, the elevation decreases: 100.000 m - 0.750 m = 99.250 m.
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