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Primary General Studies: Hong Kong Weather Warnings and Natural Hazards (Paper 2 (intermediate))
Primary General Studies: Hong Kong Weather Warnings and Natural Hazards (Paper 2 (intermediate))
Paper two moves into calculation: gaps and percentages between the three rainstorm thresholds, time for a typhoon to arrive, wind speed conversion, accumulated rainfall, warning end times and roof water collection.
Direct answers Write the given values and the unknown, pick the formula, then check units; those three steps avoid most traps.
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: Primary General Studies: Hong Kong Weather Warnings and Natural Hazards |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationAmber means thirty millimetres and red means fifty. How much more is red?
- FoundationHow many millimetres apart are the black and amber thresholds?
- FoundationTaking amber as the base, by what percentage is the black threshold higher?
- IntermediateA typhoon is five hundred kilometres away and closes in at twenty kilometres per hour. How long until it is closest?
- IntermediateSixty-three kilometres per hour is how many metres per second?
- IntermediateRain falls at twenty-five millimetres per hour for four hours. What is the total?
- ChallengeA rainstorm warning starts at 2:30 pm and lasts five and a half hours. When does it end?
- ChallengeTwo hundred millimetres of rain falls on a ten square metre roof. How many litres is that?
- ChallengeWhat is the wind speed difference between signal 8 and signal 10?
- Error redoA classmate says signal 8 always stops all work in Hong Kong. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Twenty millimetres more. | Subtract thirty from fifty to get twenty millimetres. |
| 2 | Forty millimetres apart. | Seventy minus thirty equals forty millimetres. |
| 3 | About one hundred and thirty-three point three per cent higher. | Divide forty by thirty, then multiply by one hundred. |
| 4 | Twenty-five hours. | Distance divided by speed: five hundred divided by twenty is twenty-five. |
| 5 | About seventeen point five metres per second. | Divide kilometres per hour by three point six. |
| 6 | One hundred millimetres. | Multiply the hourly rate by the hours: twenty-five times four is one hundred. |
| 7 | It ends at 8:00 pm. | Fourteen thirty plus five and a half hours is twenty hundred hours. |
| 8 | Two thousand litres. | Two hundred millimetres is 0.2 metres, times ten square metres gives two cubic metres, which is two thousand litres. |
| 9 | Fifty-five kilometres per hour. | One hundred and eighteen minus sixty-three is fifty-five. |
| 10 | It is too absolute; work and school arrangements follow official announcements. | Signal 8 only means the wind reached the threshold, while the actual arrangement is announced by the government. |
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.
Then try paper three, using voltage and current to work out power and resistance.Tutor Registration →
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