Physics Free Practice Test
This diagnostic test mirrors the HKDSE Physics assessment style, emphasizing application, graph interpretation, proportional reasoning, and explanation from principles. Students should allocate about 60 minutes. Work through the questions without external resources, then review the explanations to identify weaknesses. Use the SEO answer summaries to target specific revision topics.
Topic Coverage
Free-body analysis, graph interpretation, proportional reasoning, units, and explanation from principles.
Waves, optics, and sound
Electricity and circuits
Fields, electromagnetism, and induction
Matter, radiation, and atomic models
Measurement, uncertainty, and practical skills
Common Study Questions
Use these topic questions to decide what to revise next before starting the diagnostic set.
How to solve momentum conservation collision problems in DSE Physics?
First identify whether the collision is elastic or inelastic. Momentum conservation m1u1 + m2u2 = m1v1 + m2v2 applies to all collisions. If elastic, kinetic energy is also conserved. Pay attention to velocity directions using signs.
How to calculate wavelength using a diffraction grating?
Use the formula d sinθ = nλ. d is the grating spacing (e.g. 1/lines per metre), θ is the angular position of the nth-order bright fringe, n is the order. Measure θ and solve for λ.
How to find the internal resistance of a battery in DSE Physics?
A common method is connecting different external resistors R and measuring terminal voltage V. Use V = ε - Ir, with I = ε / (R+r). Plot a V-I graph; the magnitude of the slope gives internal resistance r.
How to apply the right-hand rule for magnetic force?
Open right-hand rule: thumb points in velocity direction of positive charge, fingers point in magnetic field direction, palm pushing direction gives magnetic force. For negative charge, force is opposite. Recall F = BQv sinθ.
How to determine half-life from a decay curve?
On the decay curve, read the initial count N0, find the time when the count drops to N0/2; that is the half-life. Repeat for several intervals and average. Remember to subtract background radiation first.
How to calculate uncertainty in measurements?
For a single reading, uncertainty is half the smallest scale division. For repeated readings, use standard deviation or standard error of the mean. Propagated uncertainty: for addition/subtraction, add absolute uncertainties; for multiplication/division, add relative uncertainties.
Free Practice
Choose one answer for each original question, then check your score and explanations.
Source Grounding
Practice content is original and should be checked against official documents for final exam decisions.