Question 19. A ball of mass 0.5 kg is projected horizontally from a 20 m high cliff at 15 m/s. Air resistance negligible.
(i) Time of flight.
(ii) Horizontal range.
(iii) Speed just before impact.
The first two were gifts. ( t = \sqrt\frac2hg = \sqrt\frac409.8 \approx 2.02 \text s ).
Range ( = 15 \times 2.02 = 30.3 \text m ).
But part (iii) — that was the philosopher's question. dse physics mock paper
Vertical velocity just before impact: ( v_y = gt \approx 19.8 \text m/s ).
Horizontal velocity unchanged: ( v_x = 15 \text m/s ).
Speed ( = \sqrtv_x^2 + v_y^2 = \sqrt225 + 392.04 = \sqrt617.04 \approx 24.84 \text m/s ).
Ming paused. The ball doesn't decide its speed. It doesn't choose the cliff or the gravity. It simply obeys. And yet, unlike the ball, he could choose — the choice to keep going, to sit this exam, to turn the page even when his hand trembled.
That was the secret no mock paper could test: the force stronger than electromagnetism or gravity. The force of still trying. Question 19
In every DSE Physics paper, there are 3-4 questions designed to separate the 5 from the 5**. A quality mock paper will include at least two questions involving multi-step electromagnetism reasoning or non-linear motion graphs.
The Hong Kong Diploma of Secondary Education (DSE) Physics examination is widely regarded as one of the most challenging science papers in the territory. With a curriculum that spans mechanics, heat, waves, electricity, electromagnetism, and atomic physics, students often find themselves overwhelmed by the sheer volume of content. Enter the DSE Physics Mock Paper—a tool that, when used correctly, can be the difference between a marginal pass and a top-tier "5**" result.
But what exactly makes a mock paper effective? Is it simply about printing a PDF and answering questions, or is there a strategy to it? In this long-form guide, we will explore the anatomy of the DSE Physics exam, the strategic role of mock papers, where to find high-quality resources, and a step-by-step plan to integrate them into your study routine. In every DSE Physics paper, there are 3-4
Create a table with three columns on a separate sheet: | Column A: Conceptual Error | Column B: Careless Error | Column C: Time Management Error | | :--- | :--- | :--- | | Forgot that light is a transverse wave | Wrote 5+3=9 | Left the last 4 MCQs blank | | Used F=ma instead of F=Gm1m2/r^2 | Forgot to convert cm to m | Spent 20 min on a 5-mark question |
Most students fixate on Column B (careless errors), but Column A (conceptual errors) is where you need to reread your textbook. Column C indicates you need to skip harder questions sooner.
Treat this like the real exam. Go to a quiet library. Set a timer for Paper 1A (45 min) + Paper 1B (1 hour 5 min). No music. No looking at formula sheets. If you get stuck on a question for more than 3 minutes, circle it and move on.