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Singapore GCE O-Level Pure Physics (6091): complete 2026 guide to the nine topics and Papers 1-3

A complete 2026 guide to Singapore GCE O-Level Pure Physics (SEAB 6091). The nine topic areas from measurement and kinematics to atomic and nuclear physics, the three-paper assessment structure, study strategy, and links to every deep dot-point answer.

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Singapore GCE O-Level Pure Physics (SEAB syllabus 6091) is a Secondary 3 to 4 course that builds a clear, quantitative picture of the physical world, from measurement and motion through forces, energy, and heat to waves, electricity, magnetism, and the atom.

This page is the index. Below: the nine topic breakdown, the three-paper assessment structure, study strategy, and links to every dot-point answer we have shipped for Pure Physics in 2026.

The topics of O-Level Physics

Measurement and Kinematics
Physical quantities and SI units, measuring length and time with the right instrument, speed, velocity, and acceleration, motion graphs, and free fall under gravity.
Forces and Dynamics
Types of force and free-body diagrams, Newton's three laws of motion, friction and the resultant force, and the turning effect of forces using moments.
Mass, Weight, Density and Pressure
The difference between mass and weight, density and how to measure it, pressure and how it varies with depth in a liquid, and gas pressure measured with a manometer or barometer.
Energy, Work and Power
Energy stores and transfers, work done by a force, kinetic and gravitational potential energy, and power and efficiency.
Thermal Physics
The kinetic particle model of solids, liquids, and gases, temperature and thermometers, thermal expansion and specific heat capacity, and melting, boiling, and latent heat.
Waves, Light and Sound
General wave properties, reflection and refraction of light, image formation by thin converging lenses, and the electromagnetic spectrum together with sound waves.
Electricity and D.C. Circuits
Static electricity and charge, current, voltage, and resistance, series and parallel circuits, and electrical energy, power, and home safety.
Magnetism and Electromagnetism
Magnets and magnetic fields, the magnetic effect of a current, the force on a current-carrying conductor, and electromagnetic induction.
Atomic and Nuclear Physics
The nuclear model of the atom, radioactivity and the three types of emission, half-life and decay, and the uses and hazards of radiation.

Assessment structure

Pure Physics 6091 is assessed across three papers.

  • Paper 1: Multiple Choice (40 marks, 1 hour). Forty compulsory multiple-choice questions, each with four options, covering the whole syllabus. This paper rewards quick, accurate recall and careful reading of units and graphs.
  • Paper 2: Structured and Free-Response (80 marks, 1 hour 45 minutes). Section A is short structured questions; Section B includes a choice of free-response questions. This paper rewards full working, correct formulae, units throughout, and clear explanations.
  • Paper 3: Practical Assessment (30 marks, 1 hour 50 minutes). A laboratory paper in which you take readings, tabulate data, plot graphs, and draw conclusions, with marks for accuracy, presentation, and analysis.

Across all three papers the examiners reward correct units, clear definitions, and sound method. A scientific calculator is allowed in the written papers.

Our 2026 Pure Physics syllabus answers

For topic coverage, every Pure Physics learning outcome we have shipped has its own focused answer page with worked exam-style questions and cross-links to related points.

Browse the full set at /sg-o-level/physics/syllabus.

Study strategy

Pure Physics rewards a small number of well-drilled habits combined with genuine understanding. The recipe:

  1. Know the definitions cold. Many marks are pure definition marks (current, pressure, density, acceleration). Write each one out until it is automatic, with the correct unit.
  2. Always show formula, substitution, and unit. A bare answer rarely earns full marks. Write the relationship, put the numbers in, then state the value with its unit.
  3. Read graphs and diagrams carefully. A large share of Paper 1 is graph and circuit reading. Practise spotting gradients, areas, and the meaning of a flat or steep line.
  4. Practise full timed papers. From Secondary 4, sit complete papers under time. Build a routine for the practical paper, repeating readings and plotting a clean best-fit line.

For the official syllabus

SEAB publishes the full 6091 syllabus document and examination requirements at seab.gov.sg. Always confirm content and assessment weightings against the current syllabus year, as SEAB reviews syllabuses periodically.

Physics guides

In-depth written guides with paired practice quizzes.

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Physics practice quizzes

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The SG-O-LEVEL system, explained

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Common questions about Physics

How is Singapore O-Level Pure Physics structured in 2026?
Pure Physics (SEAB 6091) is examined across three papers. Paper 1 is multiple-choice with 40 questions worth 40 marks in 1 hour. Paper 2 is a structured and free-response written paper worth 80 marks in 1 hour 45 minutes. Paper 3 is the practical assessment worth 30 marks in 1 hour 50 minutes. The written content is grouped into the topics of measurement, kinematics, dynamics, mass and pressure, energy, thermal physics, waves and light and sound, electricity, magnetism, and atomic physics. No formula sheet replaces understanding, so the core relationships must be known.
What is the difference between Pure Physics and Combined Science Physics?
Pure Physics (6091) is the full single-subject syllabus taken by students who want the deepest coverage, with its own three papers including a dedicated practical. Combined Science Physics is a reduced chapter taken alongside Chemistry or Biology in the Combined Science syllabus, covering fewer outcomes and assessed within the shared Combined Science papers. Students aiming for the sciences in junior college usually take Pure Physics.
Is a calculator allowed in O-Level Pure Physics?
Yes. An approved scientific calculator is allowed in the written Paper 1 and Paper 2. It is used for arithmetic, powers, and standard-form numbers. Markers still expect you to show the formula, the substitution, and the unit, so the calculator supports rather than replaces method. Knowing the relationships and rearranging them correctly is what earns the marks.
How hard is O-Level Pure Physics compared to A-Level Physics?
O-Level Pure Physics sits at Secondary 3 to 4 level and is much gentler than A-Level. It uses algebra and standard form but no calculus, and quantities such as acceleration are treated as constant where possible. The same topics, such as kinematics, forces, and electricity, reappear at A-Level in far greater mathematical depth. The O-Level focus is on clear definitions, correct units, and confident substitution into a small set of formulae.
What is the practical paper (Paper 3) and how do I prepare for it?
Paper 3 is a hands-on laboratory assessment worth 30 marks. You carry out experiments, take readings from instruments such as ammeters, voltmeters, thermometers, and metre rules, record data in tables, plot graphs, and draw conclusions. Preparation means practising real measurements, learning to reduce errors by repeating readings and using suitable ranges, and being fluent at plotting a best-fit straight line and finding its gradient.
Which formulae must I memorise for O-Level Physics?
The core set includes speed as distance over time, acceleration as change in velocity over time, the equations for uniformly accelerated motion, force as mass times acceleration, weight as mass times gravitational field strength, density as mass over volume, pressure as force over area, the liquid pressure relation, work as force times distance, kinetic and potential energy, power as energy over time, the heat capacity and latent heat relations, the wave equation, Ohm's law, resistance relations for series and parallel, and electrical power. These are all on the dot-point pages below.
How do I approach projectile motion problems?
Split the motion into horizontal (constant velocity) and vertical (constant acceleration due to gravity). Use t as the shared variable across both axes.
What's the difference between work and power?
Work (J) is energy transferred by a force over a distance. Power (W) is the rate of doing work β€” work divided by time.
When is momentum conserved?
In any collision (elastic or inelastic) where no external net force acts on the system. Kinetic energy is only conserved in elastic collisions.
What's the photoelectric effect?
Light shone on a metal can eject electrons, but only if the photon energy (hf) exceeds the work function. The kinetic energy of the ejected electron is hf - W. Evidence that light behaves as discrete quanta (photons).
How do magnetic forces on current-carrying wires work?
F = BIL sin ΞΈ for a wire in a uniform field B with current I and length L. Direction comes from the right-hand rule. Underpins motors, generators, and ammeters.