Physics IX · 2025 · Official answer key
| Question | Original SLO | Answer | Level |
|---|---|---|---|
| 1 | 1.3.1 | A | K |
| 2 | 1.5.1 | C | U |
| 3 | 1.6.1 | C | U |
| 4 | 1.7.3 | C | A |
| 5 | 2.3.2 | A | U |
| 6 | 2.8.5 | C | U |
| 7 | 2.8.2 | B | U |
| 8 | 2.9.1 | D | U |
| 9 | 2.9.2 | D | A |
| 10 | 3.2.3 | D | A |
| 11 | 3.3.3 | C | K |
| 12 | 3.3.5 | DAnswer reviewOfficial key: D (80 N). The ideal-rope tension interpretation (40 N) needs educator review before approving a teaching explanation. | U |
| 13 | 3.3.6 | A | U |
| 14 | 3.5.2 | B | U |
| 15 | 4.1.2 | C | U |
| 16 | 4.2.2 | C | A |
| 17 | 4.2.2 | D | U |
| 18 | 4.3.1 | C | K |
| 19 | 5.1.3 | D | U |
| 20 | 5.2.1 | C | A |
| 21 | 5.3.1 | D | U |
| 22 | 5.5.2 | A | U |
| 23 | 6.1.2 | A | A |
| 24 | 6.2.3 | D | A |
| 25 | 6.4.6 | C | K |
| 26 | 6.6.2 | B | U |
| 27 | 6.6.2 | D | A |
| 28 | 7.2.2 | D | A |
| 29 | 7.3.2 | D | U |
| 30 | 7.5.2 | B | U |
| 31 | 7.5.4 | C | A |
| 32 | 7.6.1 | B | U |
| 33 | 8.2.2 | A | A |
| 34 | 8.3.2 | D | A |
| 35 | 8.5.2 | D | A |
| 36 | 8.6.4 | D | U |
| 37 | 9.3.2 | D | U |
| 38 | 9.4.1 | D | U |
| 39 | 9.4.1 | CAnswer reviewOfficial key: C (poor absorbers and good emitters). This combination conflicts with the usual relationship between absorption and emission for the same radiation. An educator must review the source before this is used as a teaching explanation. | U |
| 40 | 9.5.1 | BAnswer reviewOfficial key: B (white). This appears to conflict with the usual result that a dull black surface is the better heat radiator under comparable conditions. An educator must review the source before this is used as a teaching explanation. | U |
K: Knowledge · U: Understanding · A: Application and beyond
Paper 1 · answers & explanations →