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P5 General Studies: Waste Management and the 3Rs (Paper 2: intermediate)
Tutor Prep Guide · parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety
P5 General Studies: Waste Management and the 3Rs (Paper 2: intermediate)
Paper two drills recovery rates, the food waste share and reduction targets together, training the order of multiplying then dividing.
Direct answers When you read a share in tenths, write it at once as times 0.3 or 0.4.
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: P5 General Studies: Waste Management and the 3Rs |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhy does Reduce come first among the three Rs?
- FoundationWhat is the main job of the GREEN@COMMUNITY points in Hong Kong?
- FoundationHow should food waste be handled instead of sending it to landfill?
- IntermediateFood waste is about three tenths of the 11475 tonnes thrown away daily. How many tonnes is that?
- IntermediateOne thousand households each throw away 6.12 kg a day. What is the total in tonnes?
- IntermediateIf the daily total falls by one fifth, what is the new daily total?
- ChallengeAfter that cut, about how many ten-thousand tonnes are produced in 365 days?
- ChallengeOf 2 300 tonnes of plastic waste a day, 230 tonnes are recovered. What percentage is recovered?
- ChallengeThree food waste machines handle 5 tonnes each a day. How much do they handle in 365 days?
- Error redoA pupil says Hong Kong landfills have plenty of room and can last forever. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Waste never made saves the resources and pollution of collection, transport and treatment. | Once waste exists, every later step costs money and energy. |
| 2 | They give neighbourhood drop-off points for plastics, paper, metal and glass. | They let residents recycle without travelling far. |
| 3 | Collect it separately and turn it into compost or biogas at an organic resources recovery centre. | In a landfill food waste rots without oxygen and gives off methane; separate treatment recovers value. |
| 4 | 3442.5 tonnes. | 11475 times 0.3 gives 3442.5 tonnes. |
| 5 | 6.12 tonnes. | 6.12 times 1 000 kg is 6 120 kg, which is 6.12 tonnes. |
| 6 | 9180.0 tonnes. | 11475 times 0.8 gives 9180.0 tonnes. |
| 7 | About 335.1 ten-thousand tonnes. | 9180.0 tonnes times 365 is 3 350 700 tonnes, about 335.1 ten-thousand tonnes. |
| 8 | 10.0 per cent. | 230 divided by 2 300 times 100 gives 10.0. |
| 9 | 5475 tonnes. | 3 times 5 times 365 gives 5475 tonnes. |
| 10 | It ignores capacity: the three landfills are finite and would fill within decades without waste reduction. | At over ten thousand tonnes a day, any capacity is finite, so cutting and recycling cannot wait. |
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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