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S1 English: Comparatives and Superlatives (Paper 3: challenge)
Tutor Prep Guide · parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety
S1 English: Comparatives and Superlatives (Paper 3: challenge)
Paper three chains area, velocity, run-off and time into multi-step calculations and covers oxbow lakes and peak flow.
Direct answers Write the unit at every step; volume over seconds and volume over area are the commonest slips.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: S1 English: Comparatives and Superlatives |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationA river is 12 metres wide and 1.2 metres deep with a velocity of 1.6 metres per second. What is the discharge?
- FoundationIf channel area rises by 25 per cent while velocity falls by 20 per cent, how does discharge change?
- FoundationA 40 square kilometre catchment has 1 850 millimetres of rain a year and a run-off coefficient of 0.35. What is the annual run-off in million cubic metres?
- IntermediateSpread evenly over that catchment, what depth of water does the run-off equal?
- IntermediateA 12 square kilometre catchment receives 200 millimetres of storm rain, eighty per cent of which runs off within six hours. What is the mean peak discharge?
- IntermediateA discharge of 23.04 cubic metres per second lasts a year. What is the annual volume in million cubic metres?
- ChallengeA delta builds up 0.8 centimetres a year. How thick is it after 100 years?
- ChallengeA reservoir of 45 million cubic metres silts up by 150 000 cubic metres a year. How many years of storage remain in theory?
- ChallengeHow does an oxbow lake form?
- Error redoA student says discharge depends only on velocity. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 23.04 cubic metres per second | Twelve times 1.2 gives an area of 14.4, and times 1.6 gives 23.04. |
| 2 | It stays the same | One point two five times zero point eight is 1.00, so the two changes cancel out. |
| 3 | 25.9 million cubic metres | 0.35 times 1.85 metres times 40 million square metres gives 25.9 million cubic metres. |
| 4 | 647.5 millimetres | The volume divided by 40 million square metres gives 0.6475 metres, or 647.5 millimetres. |
| 5 | 88.9 cubic metres per second | 0.2 metres times 12 million square metres times 0.8 gives 1.92 million cubic metres, divided by 21 600 seconds gives 88.9. |
| 6 | 726.59 million cubic metres | A year has 31 536 000 seconds, and times 23.04 gives 726.59 million cubic metres. |
| 7 | 80 centimetres | Zero point eight times one hundred gives 80 centimetres, or 0.8 metres. |
| 8 | 300 years | Forty-five million divided by 150 000 gives 300 years, and the real figure is shorter. |
| 9 | A meander grows until its neck is cut through in a flood, leaving the old loop cut off from the main channel | The flow then takes the straighter path and the abandoned loop silts up at both ends. |
| 10 | Discharge is area times velocity, so width and depth matter just as much | At the same velocity a wide deep channel carries far more water. |
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.
Paper four clears the conductor, insulator and battery direction misconceptions.Tutor Registration →
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