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Primary General Studies: Transport and Communication in Hong Kong (Paper 4 (error clinic))
Primary General Studies: Transport and Communication in Hong Kong (Paper 4 (error clinic))
Paper four re-drills the most common errors from the first three papers, with different numbers throughout.
Direct answers Write the number of gaps and the unit on rough paper before answering, then sanity check the result.
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: Transport and Communication in Hong Kong |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationA minibus runs every 12 minutes from 7:00 a.m. to 8:00 a.m. How many departures are there?
- FoundationEach trip costs $9.8. What is the cost of two trips a day for 6 days?
- FoundationA vehicle covers 8 km in 0.25 hours. What is the average speed?
- IntermediateA change needs 5 minutes of walking, 16 minutes of riding and 6 minutes of waiting. What is the total time?
- IntermediatePostage is $2.2 per letter. What is the total for 4 letters?
- IntermediateA bicycle travels at 20 m/s. What is that in km/h?
- ChallengeA 25 MB file is split across two emails with a 20 MB limit. How large is each email?
- ChallengeA bus emits 60 g per passenger kilometre and a car 150 g. What is the difference over 15 km?
- ChallengeA section has 6 stations with 2 minutes between neighbours. Leaving at 8:10 a.m., when does the train arrive?
- Error redoA classmate answers 5 departures for a 7:00 to 8:00 timetable every 12 minutes. What went wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Six departures. | Sixty minutes gives 5 gaps, and counting both ends makes 6 departures. |
| 2 | $117.6. | 9.8 times 2 trips and then 6 days gives 117.6. |
| 3 | 32 km/h. | Dividing 8 by 0.25 is the same as multiplying by 4. |
| 4 | 27 minutes. | Add the three parts: 5 plus 16 plus 6 gives 27 minutes. |
| 5 | $8.8. | Multiply 22 by 4 and then place the decimal point one place from the right. |
| 6 | 72 km/h. | Multiply by 3.6, so 20 becomes 72 km/h. |
| 7 | 12.5 MB each. | Half of 25 is 12.5, and both emails stay within the limit. |
| 8 | 1 350 g. | The gap per kilometre is 90 g, and 15 km gives 1 350 g. |
| 9 | At 8:20 a.m. | Six stations give 5 gaps of 2 minutes, so 8:10 plus 10 minutes is 8:20. |
| 10 | The end departures were missed, so the answer is 6. | Both the 7:00 and 8:00 departures count, and 5 gaps give 6 departures. |
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 →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.