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P5 General Studies: Waste Management and the 3Rs (Paper 3: challenge)
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 3: challenge)
Paper three reverses the sums: capacity to landfill life, and a fall in kilograms to a percentage, plus the aluminium energy figure.
Direct answers When two units appear in one question, convert to kg or tonnes before calculating.
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)
- FoundationHow does municipal solid waste differ from domestic waste?
- FoundationWhat does waste-to-energy mean?
- FoundationWhy must used batteries stay out of ordinary recycling bins?
- IntermediateDaily waste per person falls from 1.53 kg to 1.20 kg. What is the percentage drop?
- IntermediateAt 1.20 kg per person, what is the daily total for 7.5 million people?
- IntermediateMaking a tonne of primary aluminium takes about 14 000 kWh. Recycled aluminium needs only 5 per cent of that. How many kWh?
- ChallengeA landfill has 300 million tonnes of space left and takes 11475 tonnes a day. How many years will it last?
- ChallengeIf daily waste falls by three tenths, how many years will the same space last?
- ChallengeAt 1.53 kg a day, how much does one person throw away in 365 days?
- Error redoA pupil says 1.53 kg means 1.53 tonnes per person per day. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Municipal solid waste covers domestic, commercial and industrial waste, so it is wider than domestic waste. | Counting only domestic waste understates the whole picture. |
| 2 | Burning waste that cannot be recycled to make electricity, cutting landfill volume and recovering energy. | Ash is left behind, so waste-to-energy cannot replace reducing waste. |
| 3 | They hold heavy metals and electrolyte and need separate collection, or they pollute the general waste stream. | Rechargeable and button cells should go to designated collection points. |
| 4 | 21.6 per cent. | The gap is 0.33 kg; 0.33 over 1.53 times 100 gives 21.6. |
| 5 | 9000 tonnes. | 1.20 times 7 500 000 kg is 9 000 000 kg, which is 9000 tonnes. |
| 6 | 700 kWh. | 14 000 times 0.05 gives 700 kWh. |
| 7 | About 71.6 years. | 300 000 000 divided by 11475 then by 365 gives 71.6 years. |
| 8 | About 102.3 years. | Daily waste becomes 8032.5 tonnes; the space divided by that and by 365 gives 102.3 years. |
| 9 | 558.45 kg. | 1.53 times 365 gives 558.45 kg, about half a tonne. |
| 10 | The unit is wrong: 1.53 kg is about one and a half kilograms, or 0.00153 tonnes. | One tonne is 1 000 kg, so treating kg as tonnes inflates the figure a thousand times. |
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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