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HKDSE Physics Paper 1 Mock Paper (2027): 20 MC and 6 Section B Questions with Answers
TUTORZONE ORIGINAL MOCK PAPER · HKDSE PHYSICS PAPER 1
Written to the HKEAA 2027 framework: Paper 1 covers the Compulsory Part, 60% of the subject, 2 hours 30 minutes, with Section A multiple-choice worth 21% of the subject mark and Section B (short, structured and essay questions) worth 39%, all compulsory. This paper has 20 MC items and 6 Section B questions with answers and mark allocation.
What is in HKDSE Physics Paper 1?
Direct answer: Paper 1 covers the Compulsory Part, is 60% of the subject and lasts 2 hours 30 minutes, with every question compulsory. Section A is multiple-choice and takes 21% of the subject mark; Section B – short questions, structured questions and one essay – takes the remaining 39%. The Elective Part is Paper 2 (20%) and SBA is 20%.
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Section A (multiple-choice) | Compulsory Part; 21% of the subject mark | 21%（全科） | 35-40 min |
| Section B (short, structured, essay) | Compulsory Part; 39% of the subject mark, ending with an essay question | 39%（全科） | 100-110 min |
| Paper 1 total | All questions compulsory; Paper 2 (Electives) is another 20% in 1 hour (four topics at 10%, answer two) plus SBA 20% for school candidates | 60% | 2 h 30 min |
Cut the 150 minutes as 38 for Section A, 105 for Section B and 7 to check. Section B marks sit in the three steps formula, substitution, units – write all three and you keep method marks even if the number slips.
How this paper was built
This is a TutorZone original mock paper: the questions follow the 2027 framework’s structure (Section A MC at 21% of the subject mark, Section B at 39%, all compulsory) and the answers and mark allocation are our own, not HKEAA past papers or marking references.
HKEAA publishes no fixed question count for Paper 1, so this paper sets its own: 20 MC items and 6 Section B questions, one of them an essay question. Every numeric answer was recomputed programmatically.
Pacing
| Section | Marks | Suggested time | What to do first |
|---|---|---|---|
| Section A (multiple-choice) | 21%（全科） | 35-40 min | Formula and concept only; flag anything you cannot route |
| Section B (short, structured, essay) | 39%（全科） | 100-110 min | Formula first, then substitute; keep units and significant figures |
| Paper 1 total | 60% | 150 min (about 40 for A and 105 for B) | Keep 12-15 minutes for the essay question |
How should the 150 minutes be split?
Direct answer: about 38 minutes on Section A, 105 on Section B and 7 to check. Section B marks sit in formula, substitution and units – write all three and a slip in the number still earns method marks. Give the essay 12-15 minutes rather than the last five.
Section A: multiple-choice (20 questions, 21% of the subject mark)
Aim for 35-40 minutes. MC items test units and orders of magnitude too, so read the options first.
Question 1
A car accelerates from rest at 2 m s⁻² for 3 s. Find its speed.
A. 3 m s⁻¹B. 12 m s⁻¹C. 5 m s⁻¹D. 6 m s⁻¹
Question 2
A 2 kg body moves at 3 m s⁻¹. Find its kinetic energy.
A. 12 JB. 9 JC. 18 JD. 6 J
Question 3
A 20 N force pushes an object 3 m along its direction. Find the work done.
A. 23 JB. 180 JC. 20 JD. 60 J
Question 4
A machine does 600 J of work in 20 s. Find its power.
A. 120 WB. 12 WC. 30 WD. 1200 W
Question 5
A 3 kg object is lifted 4 m (take g = 10 m s⁻²). Find the gain in gravitational potential energy.
A. 300 JB. 12 JC. 120 JD. 70 J
Question 6
A body of mass 400 g has volume 50 cm³. Find its density.
A. 0.125 g cm⁻³B. 4.5 g cm⁻³C. 45 g cm⁻³D. 8 g cm⁻³
Question 7
A 300 N force acts at right angles on an area of 0.5 m². Find the pressure.
A. 1500 PaB. 150 PaC. 300 PaD. 600 Pa
Question 8
0.5 kg of water is heated through 20 °C (specific heat capacity 4200 J kg⁻¹ °C⁻¹). Find the energy required.
A. 84 000 JB. 42 000 JC. 4 200 JD. 420 J
Question 9
0.2 kg of ice melts completely (specific latent heat 334 000 J kg⁻¹). Find the energy required.
A. 1 670 000 JB. 6 680 JC. 334 000 JD. 66 800 J
Question 10
A wave has frequency 50 Hz and wavelength 0.4 m. Find its speed.
A. 20 m s⁻¹B. 125 m s⁻¹C. 12.5 m s⁻¹D. 5 m s⁻¹
Question 11
A current of 2 A flows through a 5 Ω resistor. Find the voltage across it.
A. 20 VB. 2.5 VC. 7 VD. 10 V
Question 12
A 12 V supply is connected to a 6 Ω resistor. Find its power.
A. 36 WB. 2 WC. 24 WD. 72 W
Question 13
Two resistors, 3 Ω and 6 Ω, are connected in series. Find the total resistance.
A. 2 ΩB. 4.5 ΩC. 18 ΩD. 9 Ω
Question 14
Two resistors, 6 Ω and 3 Ω, are connected in parallel. Find the total resistance.
A. 2 ΩB. 4.5 ΩC. 6 ΩD. 9 Ω
Question 15
A 1 kW appliance runs for 2 hours. How much electrical energy is used?
A. 120 kWhB. 0.5 kWhC. 20 kWhD. 2 kWh
Question 16
A transformer has 2200 turns on the primary and 110 on the secondary. The primary voltage is 220 V. Find the secondary voltage.
A. 110 VB. 22 VC. 11 VD. 440 V
Question 17
Light travels from a medium of refractive index 1.5 into air. Find the critical angle (1 d.p.).
A. 30.0°B. 56.4°C. 41.8°D. 48.6°
Question 18
A radioisotope has a half-life of 5 days. How much of an 80 g sample remains after 15 days?
A. 16 gB. 40 gC. 20 gD. 10 g
Question 19
What does an alpha particle consist of?
A. 2 個質子與 2 個中子B. 4 個質子C. 2 個質子與 2 個電子D. 1 個質子與 1 個中子
Question 20
An object is 30 cm from a convex lens of focal length 10 cm. Find the image distance.
A. 7.5 cmB. 15 cmC. 20 cmD. 40 cm
Section B: short, structured and essay questions (6 questions, 39% of the subject mark)
Aim for 100-110 minutes. State the formula, substitute, then give units; keep 12-15 minutes for the essay.
Question 1 (6 marks)
A ball is released from rest 20 m above the ground (g = 10 m s⁻²). (a) Find its speed on landing; (b) find the time to land; (c) with air resistance, would the landing speed be greater, smaller or the same? Explain.
Question 2 (8 marks)
Resistors of 3 Ω and 6 Ω are first connected in series to a 9 V battery. (a) Find the current; (b) find the voltage across the 6 Ω resistor; (c) find the power of the 3 Ω resistor; (d) if they are reconnected in parallel, find the total resistance.
Question 3 (7 marks)
In an experiment to measure the specific heat capacity of water, 0.2 kg of water absorbs 33 600 J and its temperature rises by 40 K. (a) Find the specific heat capacity; (b) suggest two measures that reduce heat loss and state what each one does.
Question 4 (7 marks)
A shout in a valley is heard as an echo 1.2 s later (speed of sound in air 340 m s⁻¹). (a) Find the distance to the cliff; (b) find the wavelength of a 170 Hz sound; (c) why is an echo clearer in a valley than in a classroom?
Question 5 (8 marks)
A transformer has a primary voltage of 220 V and a secondary voltage of 22 V with a secondary current of 2 A. Its efficiency is 90%. (a) Find the output power; (b) find the input power; (c) find the primary current (3 s.f.); (d) explain why a transformer cannot be 100% efficient.
Question 6 (9 marks) essay question
Discuss two advantages and two disadvantages of generating electricity from nuclear power (each with a reason), then explain why a city such as Hong Kong should not rely on nuclear power alone.
Where are the answers, and do they show the steps?
Direct answer: every question is followed by an answer-and-marks block giving the formula, the substituted values, the answer with units and the marks each step earns (the circuit question: 2 marks for total resistance, 2 for the voltage, 2 for the power, 2 for the parallel part), plus the usual losses.
Section A answers and explanations
Question 1
Answer: D (6 m s⁻¹) v = u + at = 0 + 2 × 3.
Question 2
Answer: B (9 J) KE = ½mv² = ½ × 2 × 9.
Question 3
Answer: D (60 J) W = Fs = 20 × 3.
Question 4
Answer: C (30 W) P = W ÷ t = 600 ÷ 20.
Question 5
Answer: C (120 J) PE = mgh = 3 × 10 × 4.
Question 6
Answer: D (8 g cm⁻³) Density = mass ÷ volume = 400 ÷ 50.
Question 7
Answer: D (600 Pa) p = F ÷ A = 300 ÷ 0.5.
Question 8
Answer: B (42 000 J) Q = mcΔT = 0.5 × 4200 × 20.
Question 9
Answer: D (66 800 J) Q = mL = 0.2 × 334 000.
Question 10
Answer: A (20 m s⁻¹) v = fλ = 50 × 0.4.
Question 11
Answer: D (10 V) V = IR = 2 × 5.
Question 12
Answer: C (24 W) P = V² ÷ R = 144 ÷ 6.
Question 13
Answer: D (9 Ω) In series they add: 3 + 6. Only in parallel is it 2 Ω.
Question 14
Answer: A (2 Ω) 1/R = 1/6 + 1/3 = 1/2, so R = 2 Ω.
Question 15
Answer: D (2 kWh) E = Pt = 1 kW × 2 h (in kWh).
Question 16
Answer: C (11 V) Turns ratio 2200 : 110 = 20 : 1, so 220 ÷ 20 = 11 V.
Question 17
Answer: C (41.8°) sin C = 1 ÷ 1.5 → C ≈ 41.8°.
Question 18
Answer: D (10 g) 15 days = 3 half-lives: 80 → 40 → 20 → 10 g.
Question 19
Answer: A (2 個質子與 2 個中子) An alpha particle is a helium nucleus: 2 protons and 2 neutrons.
Question 20
Answer: B (15 cm) 1/v = 1/f − 1/u = 1/10 − 1/30 = 2/30.
Section B answers and mark allocation
Question 1
(a) v² = 2gh = 2 × 10 × 20 = 400 → v = 20 m s⁻¹ (2 marks); (b) h = ½gt² → 20 = 5t² → t = 2 s (2 marks); (c) smaller (1 mark) – air resistance turns some gravitational PE into internal (thermal) energy, leaving less for KE (1 mark).
Question 2
(a) R = 3 + 6 = 9 Ω, I = 9 ÷ 9 = 1 A (2 marks); (b) V = IR = 1 × 6 = 6 V (2 marks); (c) P = I²R = 1² × 3 = 3 W (2 marks); (d) 1/R = 1/3 + 1/6 = 1/2 → 2 Ω (2 marks).
Question 3
(a) c = Q ÷ (mΔT) = 33 600 ÷ (0.2 × 40) = 4 200 J kg⁻¹ K⁻¹ (3 marks); (b) a lid (1 mark) cutting convection and evaporation losses (1 mark); an insulated cup or lagging (1 mark) cutting conduction and radiation (1 mark).
Question 4
(a) Distance = 340 × 1.2 ÷ 2 = 204 m (3 marks; the division by 2 is the point); (b) λ = v ÷ f = 340 ÷ 170 = 2 m (2 marks); (c) the cliff is far enough for a clear time gap and there is little absorbing material (2 marks).
Question 5
(a) P = VI = 22 × 2 = 44 W (2 marks); (b) input = 44 ÷ 0.9 = 48.9 W (2 marks); (c) I = P ÷ V = 48.9 ÷ 220 ≈ 0.222 A (2 marks); (d) hysteresis and eddy-current losses in the core plus resistance (copper) losses in the coils turn some energy into heat (2 marks).
Question 6
Advantages (2 marks each): a very large energy release per unit of fuel, so fuel volumes, transport and storage costs are small; and no carbon dioxide or major air pollutants are produced in operation.
Disadvantages (2 marks each): radioactive waste needs long-term isolation, with siting and cost problems; and an accident can contaminate a wide area for a long time, creating high public risk.
Conclusion (1 mark): a diversified generation mix – nuclear as part of a low-carbon base load, alongside other sources and growing renewables – spreads both supply risk and accident risk.
Where are Paper 1 marks most easily lost?
Direct answer: not on the hard questions but on skipped steps and units – answers without formulas, wrong significant figures, series and parallel confused – and on writing the essay in two or three lines, when it is marked per point, reason and example.
Where these marks are usually lost
| Mistake | What it looks like | What it costs | Instead |
|---|---|---|---|
| Answers without formulas | Writing the number straight away | Structured physics marks are formula + substitution + answer | Open every part with the formula and what each symbol means |
| Units and significant figures | Bare numbers | Wrong or missing units and accuracy lose marks directly | Carry units through the substitution and check accuracy at the end |
| Treating the essay as a gap-fill | Two or three lines | The essay is marked per point with a reason | Give every point a reason and a course example |
| Mixing up series and parallel | Just adding resistances | Parallel resistance is always smaller than the smallest one | Decide series or parallel first, then add or take reciprocals |
How to use this paper
First sit: no references, the full 150 minutes, no formula sheet.
Mark it: tick each of formula, substitution and units; separate conceptual errors from arithmetic ones.
Second sit: redo it three to seven days later, aiming for every Section B step written out, not just a right answer.
What should I do after this paper?
Direct answer: list every part where a formula, substitution or unit was missing; drill past-paper questions by topic (mechanics, heat, waves, electricity and magnetism, radioactivity); then redo Section B three to seven days later aiming for every step written out.
FAQ
Is this an HKEAA paper?
No. The questions, answers and mark allocation are TutorZone originals; only the framework figures (60%, 21%, 39%, 150 minutes) come from the HKEAA 2027 assessment framework.
How many questions does Paper 1 have?
HKEAA publishes no fixed count. This paper sets its own: 20 MC items and 6 Section B questions, proportioned to the 21/39 split.
What about Paper 2 and SBA?
Paper 2 covers the Elective Part: 20%, 1 hour, four topics at 10% each, answer two. SBA is 20% and compulsory for school candidates.
Official references
| Resource | What to check |
|---|---|
| HKEAA 2027 HKDSE Physics Assessment Framework | Confirm Paper 1’s 60%, 2 h 30 min, Section A 21% and Section B 39% |
| https://www.tutorzone.com.hk/en-dse-physics-paper-1-drill-guide/ | Paper 1 drilling guide: pacing and structured-question writing |
| https://www.tutorzone.com.hk/en-dse-physics-paper-2-electives-drill-guide/ | Paper 2 (Electives) drilling guide |
Related: practice area · Paper 2 electives guide · Maths Paper 1 mock
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