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P3 General Studies: Map Reading and Land Use in Hong Kong (Paper 4 (error clinic))
Tutor Prep Guide · bearings and scale conversion, legends and contour reading, and the land uses and reclamation of Hong Kong
P3 General Studies: Map Reading and Land Use in Hong Kong (Paper 4 (error clinic))
Paper four drills the ten commonest slips: scale and units, legends, contour spacing, bearings and land use shares.
Direct answers Write cm, then m, then km every time; finishing all three steps protects the factor of ten.
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: P3 General Studies: Map Reading and Land Use in Hong Kong |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationOn a 1:20,000 map, 5 cm is how many metres on the ground?
- FoundationThe legend is decoration and does not affect map reading. Where is the mistake?
- FoundationAn 8 cm line on a 1:25,000 map is 2 km; walking at 4 km per hour takes how long?
- IntermediateSparser contours mean a steeper slope. Where is the mistake?
- IntermediateThree land uses take 45 and 35 per cent; the rest is roads. What share is roads?
- IntermediateWhat is the bearing of north-east?
- ChallengeWhich is more detailed, a 1:10,000 or a 1:100,000 map?
- ChallengeA district of 250 square kilometres is 70 per cent countryside; how much is urban?
- ChallengeMaps show position but never height. Is that right?
- Error redoError clinic: on a 1:50,000 map, 1 cm equals 50 m. Where is the mistake?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 1,000 metres. | 5 × 20,000 = 100,000 cm, that is 1,000 metres or 1 kilometre. |
| 2 | The legend is the key to the symbols; without it the features cannot be identified. | The same colour can mean different things on different maps, and only the legend settles which. |
| 3 | 30 minutes. | 8 × 25,000 = 200,000 cm or 2 km; 2 ÷ 4 = 0.5 hour, that is 30 minutes. |
| 4 | Sparser contours mean less height gained over the same distance, so the slope is gentler. | Steepness depends on the spacing between lines, never on how thick they are drawn. |
| 5 | 20 percentage points. | 100 − 45 − 35 = 20; the shares must add up to 100 per cent. |
| 6 | 45 degrees. | North-east lies halfway between north at 0 and east at 90 degrees. |
| 7 | The 1:10,000 one. | A smaller denominator means each centimetre covers less ground, so more detail fits. |
| 8 | 75 square kilometres. | 250 × 0.30 = 75, leaving 175 square kilometres of countryside. |
| 9 | No. | Contour lines and spot heights show relief, and many maps print summit heights. |
| 10 | It equals 500 m. | 50,000 cm is 500 m; forgetting to divide by 100 shifts the answer by a factor of ten. |
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.
With all four done, go back to the chapter page and revise the three parts of a closed circuit plus three safety habits.Tutor Registration →
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