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P5 General Studies: Waste Management and the 3Rs (Paper 1: basics)
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 1: basics)
Paper one starts from the order of the three Rs and uses the real 1.53 kg per person to build up family, class and city totals.
Direct answers Write the units first, then decide whether to divide by 1 000.
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)
- FoundationWhat do the three Rs stand for?
- FoundationWhich of the three Rs comes first?
- FoundationWhich large facilities take most of Hong Kong municipal solid waste?
- IntermediateEach person throws away 1.53 kg a day. How much does a family of four throw away daily?
- IntermediateHow much does that family of four throw away in one week (7 days)?
- IntermediateA class of 30 pupils each throw away 1.53 kg a day. What is the class total?
- ChallengeWith about 7.5 million people at 1.53 kg each, what is the daily total in tonnes?
- ChallengeOf the 11475 tonnes a day, three tenths are recovered. How many tonnes are recovered?
- ChallengeThe rest goes to landfill. About how many ten-thousand tonnes is that in a year (365 days)?
- Error redoA pupil says recycling matters most because it turns rubbish into resources. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Reduce, Reuse and Recycle. | All three start with R, and the order runs from the source to the end. |
| 2 | Reduce. | A waste that is never made needs no collection, transport or treatment. |
| 3 | The three strategic landfills. | They sit in the west, south-east and north-east of the New Territories. |
| 4 | 6.12 kg. | 1.53 times 4 gives 6.12 kg. |
| 5 | 42.84 kg. | 6.12 times 7 gives 42.84 kg. |
| 6 | 45.90 kg. | 1.53 times 30 gives 45.90 kg. |
| 7 | About 11475 tonnes. | 1.53 times 7 500 000 kg is 11 475 000 kg, which is 11475 tonnes. |
| 8 | 3442.5 tonnes. | 11475 times 0.3 gives 3442.5 tonnes. |
| 9 | About 293.2 ten-thousand tonnes. | 8032.5 tonnes a day times 365 is 2 931 862.5 tonnes, about 293.2 ten-thousand tonnes. |
| 10 | The order is wrong: reducing at source comes first and recycling comes third. | Cut first, reuse second, recycle last; recycling still costs energy and labour. |
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.
After paper one, take paper two and sort out series against parallel in one pass.Tutor Registration →
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