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S5 Geography | Natural Hazards Paper 1 (Foundation)
S5 Geography | Natural Hazards Paper 1 (Foundation)
Paper 1 starts with the basic conversions: magnitude and energy, wave arrival lag, lava speed, wind units, rainfall volume, slope geometry and tsunami speed. Every item requires the formula and the unit.
Attempt first, mark afterwards Allow about twenty-five minutes; unify units first (millimetres to metres, square kilometres to square metres, km/h to m/s), then substitute, then check whether the answer is plausible.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 items |
| Suggested time | About 25 minutes |
| Difficulty mix | Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: S5 Geography | Natural Hazards |
| Level | S5 (Secondary 5) Geography |
02 Questions (10 items)
- FoundationAn earthquake in city A measures 5 on the Richter scale and one in city B measures 7. Each unit is about 31.6 times more energy, so how many times more energy does B release?
- FoundationA station is 120 km from the epicentre, P waves travel at 8 km/s and S waves at 4 km/s. What is the arrival time difference?
- FoundationLava flows downslope at 2 m/s and a village sits 3,600 m from the front. How many minutes before the lava arrives?
- FoundationA tropical cyclone has maximum winds of 150 km/h. What is that in metres per second?
- IntermediateA storm drops 200 mm of rain on a 50 square kilometre catchment. If all of it runs off, what is the total volume in cubic metres?
- IntermediateA slope averages 30 degrees and rises 20 m from foot to crest. What is its horizontal length?
- IntermediateA tsunami crosses an ocean of mean depth 4,000 m at about the square root of g times depth, with g equal to 9.8. What is the speed in m/s and km/h, and how long for 800 km?
- ChallengeUsing the earlier volume of 10,000,000 cubic metres, how many 2,500 cubic metre pools would hold it, and what depth would it reach in a hollow 800 m by 5,000 m?
- ChallengeRiver discharge rises from 20 m³/s to a peak of 120 m³/s and stays there for 6 hours. Using the mean discharge, what total volume passes, and what is the multiple and percentage rise?
- Error redoA student claims that going from magnitude 5 to 7 only doubles the damage. What is wrong, and what is the true multiple? Also, rainfall falling from 1,200 mm to 720 mm a year is a fall of what percentage?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | About 1,000 times. | Two units apart means 31.6 squared, which is 1,000, so the gap is a thousandfold, not twofold. |
| 2 | 15 seconds. | P waves take 15 s and S waves 30 s, so the gap is 15 s; the bigger the gap, the further the epicentre. |
| 3 | 30 minutes. | 3,600 divided by 2 is 1,800 s, or 30 minutes; evacuation planning must use the fastest case, not the average. |
| 4 | About 41.67 m/s. | 150 divided by 3.6 is 41.67 m/s; reports use km/h but physics uses m/s, and mixing them distorts wind pressure badly. |
| 5 | 10,000,000 cubic metres. | 200 mm is 0.2 m and 50 square kilometres is 50,000,000 square metres, giving 10,000,000 cubic metres. |
| 6 | About 34.64 m. | The tangent of 30 degrees is about 0.5774, and 20 divided by it gives 34.64 m; steeper slopes cover less ground for the same height. |
| 7 | About 197.99 m/s, or 712.76 km/h; 800 km takes about 67 minutes. | The square root of 9.8 times 4,000 is 197.99 m/s, which is 712.76 km/h, and 800,000 m at that speed needs 4,041 s, about 67 minutes. |
| 8 | About 4,000 pools, and a depth of about 2.5 m. | 10,000,000 divided by 2,500 is 4,000 pools; the hollow covers 4,000,000 square metres, so the same volume stands 2.5 m deep. |
| 9 | A total of 1,512,000 cubic metres; discharge is 6 times the base flow, a rise of 500 per cent. | The mean is 70 m³/s over 21,600 s, giving 1,512,000 cubic metres; the multiple is 6, while the percentage rise divides the difference by the base flow. |
| 10 | The energy is 1,000 times greater, and the rainfall falls by 40 per cent. | Each unit is about ten times the amplitude and 31.6 times the energy, so two units is 31.6 squared, about 1,000; the rainfall drop divides the change by the original 1,200 mm. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
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Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.