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P5 General Studies: Waste Management and the 3Rs (Paper 4: mistake clinic)
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 4: mistake clinic)
Paper four reworks the three weakest spots: unit conversion, which materials are recyclable, and the order of the three Rs.
Direct answers Remember one line: cut, reuse, recycle, and write the unit before you calculate.
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)
- FoundationExplain Reduce, Reuse and Recycle in one line each.
- FoundationWhich should not go into a recycling bin: a used tissue, a clean can, or a glass bottle?
- FoundationWhat does going plastic-free mean?
- IntermediateA family of four throws away 1.53 kg per person a day. What is the weekly total?
- IntermediateA class of 30 throws away 45.90 kg a day. What is the total for 30 days?
- IntermediateIf the daily 11475 tonnes fall by one tenth, what is the new figure?
- ChallengeThe daily 11475 tonnes are shared equally by three landfills. How much does each take a day?
- ChallengeIf the recovery rate rises from three tenths to four tenths, how many more tonnes a day are recovered?
- ChallengeAn extra 1147.5 tonnes a day is recovered. How much is that in 365 days?
- Error redoA pupil says all plastics can go into the recycling bin. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Make less, use again, and recycle into new products. | The order is fixed: cut first, reuse next, recycle last. |
| 2 | The used tissue. | Soiled paper fibres are contaminated and belong in the general bin. |
| 3 | Cutting single-use plastic, for example by bringing your own bag and bottle. | It is a Reduce action: the point is not to create single-use plastic at all. |
| 4 | 42.84 kg. | 1.53 times 4 times 7 gives 42.84 kg. |
| 5 | 1377.0 kg. | 45.90 times 30 gives 1377.0 kg. |
| 6 | 10327.5 tonnes. | 11475 times 0.9 gives 10327.5 tonnes. |
| 7 | 3825.0 tonnes. | 11475 divided by 3 gives 3825.0 tonnes. |
| 8 | 1147.5 tonnes. | The extra tenth is 11475 times 0.1, which is 1147.5 tonnes. |
| 9 | 418837.5 tonnes. | 1147.5 times 365 gives 418837.5 tonnes. |
| 10 | It over-generalises: only recyclable plastics such as PET bottles and HDPE containers are taken; contaminated or mixed plastics are not. | Rinse, remove caps, and check which types the drop-off point accepts. |
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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