How to Ace IGCSE Physics Paper 1: Multiple Choice (Core)

What Paper 1 demands

Cambridge IGCSE Physics Paper 1 is a 45-minute examination consisting of 40 multiple-choice questions, each carrying one mark. It assesses the Core curriculum only, covering the five main topic areas of the 0625 syllabus: general physics, thermal physics, properties of waves, electricity and magnetism, and nuclear physics. The paper is straightforward in structure, yet it is precisely this apparent simplicity that leads many candidates to underperform. A disciplined approach to time, technique, and topic coverage separates strong performances from average ones.

Unlike Papers 2 and 4, where partial marks can be earned through method and working, Paper 1 offers no partial credit. Each question is either correct or incorrect. This binary nature makes preparation strategy especially important: a candidate who has mastered elimination techniques and time discipline will reliably outperform one who knows the same physics but approaches the paper without a plan.

Paper structure and mark allocation

Every question on Paper 1 presents four answer options labelled A, B, C, and D. Only one option is correct. There is no penalty for incorrect answers, which has a direct tactical implication: every question should receive an answer, even when you are uncertain. Leaving a question blank guarantees zero marks, while guessing gives at least a 25 per cent chance of gaining one.

The 40 questions are arranged roughly in syllabus order. Questions on general physics (measurement, motion, forces, energy) typically appear first, followed by thermal physics, waves, electricity and magnetism, and finally nuclear physics. This ordering is not rigid, but it holds as a general pattern across most examination sittings.

General physics and electricity together account for the largest share of the paper. These two areas demand the most thorough preparation, though neglecting smaller sections such as nuclear physics is a mistake candidates often regret.

Time management: the 60-second rule

With 45 minutes for 40 questions, the arithmetic yields roughly 67 seconds per question. In practice, some questions can be answered in under 30 seconds, while calculation-heavy items may require two minutes or more. The effective strategy is to divide the paper into two passes.

1. First pass (25-30 minutes): Work through all 40 questions in order. Answer every question you can handle confidently and quickly. If a question requires more than about 90 seconds of thought, mark it clearly on the question paper and move on.
2. Second pass (10-15 minutes): Return to the marked questions. With the pressure of the clock somewhat reduced and the rest of the paper behind you, these harder questions can now receive your full attention.
3. Final check (3-5 minutes): If time permits, scan your answer sheet for any blank responses. Ensure every question has a recorded answer and that your marks on the answer sheet align with the question numbers on the paper.

A common error is to spend five minutes on a single difficult question during the first pass, only to discover that three straightforward questions at the end of the paper never received answers at all. The two-pass approach prevents this entirely.

Elimination: the most reliable MCQ technique

Elimination is the most powerful tool available on a multiple-choice paper. Rather than trying to identify the correct answer directly, work backwards by removing options that are clearly wrong. Reducing four choices to two immediately doubles the probability of a correct guess from 25 to 50 per cent.

Consider a typical IGCSE Physics question: "A block of mass 5 kg is lifted 3 m vertically. What is the gain in gravitational potential energy? (Take g = 10 N/kg)." The options are A: 1.5 J, B: 15 J, C: 50 J, D: 150 J.

1. Calculate directly: E = mgh = 5 x 10 x 3 = 150 J.
2. If you are uncertain about the formula, note that 1.5 J is far too small for lifting 5 kg through 3 m. Eliminate A.
3. Option C (50 J) would result from using g = 10 but omitting one factor in the multiplication. The arithmetic does not support it. Eliminate C.
4. Option B (15 J) results from multiplying mass by height alone (5 x 3 = 15), forgetting g entirely. Eliminate B.
5. D remains: 150 J.

The worked elimination confirms the calculated answer. Even if you had not remembered E = mgh, eliminating implausible values would have guided you toward D. This is the core principle: when direct knowledge fails, systematic elimination often succeeds.

Recognising common distractor patterns

Cambridge examiners construct incorrect options (known as distractors) with considerable care. They are not random values placed to confuse; they are the precise answers a candidate would reach by making specific, predictable errors. Recognising these patterns allows you to sidestep them.

The partial-calculation trap is particularly effective. A question may ask for power, but one distractor gives the energy, a value you compute along the way to the final answer. Candidates who stop one step early select this distractor without realising their error. Always re-read the stem after arriving at a numerical value to verify that it answers the specific quantity requested.

Handling calculations without a calculator

Roughly one third of the questions on IGCSE Physics Paper 1 involve numerical calculations. These range from simple substitutions into standard equations to multi-step problems requiring unit conversions and rearranged formulae. Cambridge does not permit calculators on this paper, so all numerical answers must be reachable by hand or mental arithmetic. The questions are designed with this constraint in mind, typically using round numbers that simplify cleanly.

• Write the formula first. Even though no working is formally marked, writing the equation on the question paper reduces errors and keeps your thinking organised. Speed = distance / time, not distance x time.
• Convert units before substituting. If a question gives mass in grams and height in centimetres, convert to kilograms and metres before plugging values into mgh. Many distractors are simply the result of a correct calculation performed with unconverted units.
• Estimate before calculating precisely. If your calculated answer is 0.003 J for the energy stored in a battery, something has gone wrong. A rough mental estimate catches order-of-magnitude errors that precise arithmetic sometimes misses.
• Use the options as a check. After calculating, scan the four choices. If your answer matches one of them, select it. If it does not appear among the options, review your working immediately rather than trying to force a match.

Qualitative and conceptual questions

Not every question on Paper 1 involves numbers. Approximately half of the paper tests qualitative understanding: definitions, explanations of phenomena, identification of correct diagrams, and the application of physics concepts to unfamiliar situations. These conceptual questions reward clarity of understanding over speed of calculation.

For definition-based questions, precision is essential even though the format only requires selecting the correct option from four. If the question asks for the definition of "velocity," the answer must include both speed and direction. An option that says "the rate of change of distance" describes speed, not velocity. It is a close distractor, designed specifically for candidates who treat the two terms as interchangeable.

Diagram-based questions appear frequently. These may ask candidates to identify the correct ray diagram for refraction, the correct circuit diagram for a specified arrangement, or the correct magnetic field pattern around a current-carrying wire. When answering these, apply the underlying physical rule systematically rather than relying on visual memory alone. For refraction, check whether the ray bends toward or away from the normal when entering a denser medium. For circuits, verify that series components share one current path and parallel components have separate branches. Systematic checking catches errors that intuition alone does not.

Topic-specific guidance

General physics

Questions on motion often present distance-time or speed-time graphs and ask for derived quantities. The gradient of a distance-time graph gives speed, while the gradient of a speed-time graph gives acceleration. The area under a speed-time graph gives distance travelled. These three relationships resolve the majority of graph-based questions on Paper 1. Practise reading values directly from graphs, including cases where the axes use non-standard scales.

Moments and equilibrium questions require identifying the pivot and calculating clockwise and anticlockwise moments. The principle of moments states that for a body in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments about any point. A common distractor in these questions uses the total length of a beam rather than the perpendicular distance from the pivot to the line of action of each force.

Thermal physics

Thermal expansion, conduction, convection, and radiation are tested through scenario-based questions. A common format presents a practical situation and asks which process explains a given observation. Conduction requires a solid medium and works particle to particle. Convection requires a fluid and involves bulk movement of heated material. Radiation requires no medium and travels as infrared electromagnetic waves. Identifying the medium (or lack of one) in the question stem usually resolves the answer without difficulty.

Waves

Wave questions test the relationship v = f x wavelength. For light, know the qualitative form of Snell's law: light bends toward the normal when entering a denser (optically slower) medium and away from the normal when leaving it. The critical angle and total internal reflection appear at Core level only in descriptive terms. Sound wave questions frequently test the relationship between pitch and frequency, and between loudness and amplitude.

Electricity and magnetism

This section carries the heaviest weighting on the paper. Circuit questions are especially common: expect at least three or four involving V = IR, the series/parallel rules, or power calculations using P = IV. Practise identifying whether a given circuit is series, parallel, or a combination before performing any calculations. Magnetic field pattern questions ask candidates to recognise the field around a bar magnet, a straight conductor, or a solenoid. These are tested on almost every sitting of the paper.

Nuclear physics

The smallest section of the paper, yet one where marks are readily available to well-prepared candidates. Know the three types of radiation (alpha, beta, gamma), their penetrating power, ionising ability, and behaviour in electric and magnetic fields. Half-life questions require halving the activity or count rate repeatedly. The arithmetic is straightforward, but the concept of exponential decay catches candidates who attempt to apply linear reasoning.

The answer sheet: avoiding administrative errors

Paper 1 is optically scanned. Each answer must be recorded as a single, clearly shaded lozenge on a separate answer sheet. If you change an answer, erase the original mark completely. A machine cannot distinguish between a deliberate second mark and a careless one, and two marked responses for the same question will be recorded as no valid response.

• Use an HB pencil for the answer sheet. Pen marks cannot be erased, and ink may not scan reliably.
• Shade each lozenge firmly and completely. A faint or partial mark may fail to register.
• Do not fold or crease the answer sheet.
• Write your candidate details exactly as instructed in the header section of the sheet.

Building a revision plan for Paper 1

The most effective preparation for IGCSE Physics Paper 1 combines topic revision with timed practice papers. Neither alone is sufficient. Topic revision builds the knowledge base; timed practice builds the speed and technique needed to deploy that knowledge under examination conditions.

1. Begin with topic revision. Work through each of the five syllabus areas systematically. Use the syllabus checklist to identify any Core content you have not yet covered.
2. Practise individual topics. Complete past-paper questions filtered by topic. Focus on areas where you make the most errors, not the areas you find most comfortable.
3. Move to full timed papers. Once your topic knowledge is secure, sit complete past papers under timed conditions: 45 minutes, no calculator. Record your score each time.
4. Review every error. After each practice paper, go through every question you answered incorrectly. Determine whether the error was a knowledge gap, a misread question, a calculation mistake, or a timing problem. Each type of error requires a different remedy.
5. Track progress over time. Aim for improvement across successive papers. If your score plateaus, examine which topics or question types are holding it down and return to targeted revision in those areas.

Past papers from previous Cambridge examination sessions are publicly available and represent the single most valuable revision resource for this paper. The style, difficulty level, and question patterns of published papers closely mirror what candidates will face in the live examination. Working through at least five to eight complete papers provides a thorough exposure to the full range of question types.

Test yourself

The following questions simulate the style and difficulty of Paper 1. Select the single best answer for each.

1. A car travels 300 m in 20 s. What is its average speed?
   A: 6 m/s    B: 15 m/s    C: 150 m/s    D: 6000 m/s
2. Which type of radiation is stopped by a thin sheet of paper?
   A: Alpha    B: Beta    C: Gamma    D: X-rays
3. Two resistors of 6 ohms each are connected in parallel. What is the combined resistance?
   A: 3 ohms    B: 6 ohms    C: 12 ohms    D: 36 ohms
4. A force of 12 N acts at a perpendicular distance of 0.5 m from a pivot. What is the moment of the force?
   A: 0.04 N m    B: 6 N m    C: 12.5 N m    D: 24 N m

Final preparation

The night before the examination is not the time to learn new content. By that stage, revision should be consolidating what you already know. Review your notes on the topics where you have historically made the most errors, and look over one past paper you have already completed, paying attention to the precise wording Cambridge uses in its correct answers and mark scheme.

On the day itself, read each question on Paper 1 carefully before looking at the options. Many errors stem from answering the question a candidate expected rather than the one that was actually set. After selecting an answer, re-read the question stem one final time to confirm your choice addresses what was asked. This habit takes only a few seconds per question but catches misreads that would otherwise cost marks.

IGCSE Physics Paper 1 rewards preparation, discipline, and method. The physics knowledge is necessary, but technique transforms that knowledge into marks. Candidates who combine solid topic understanding with systematic time management and practiced elimination strategies consistently achieve their strongest possible scores on this paper.