How to Answer 6-Mark Questions in Edexcel GCSE Physics

Six-mark questions are the highest-tariff questions on your Edexcel GCSE Physics papers. They carry more marks than any other single question, and they are marked differently from everything else on the paper. Most students find them intimidating, but once you understand how they work, they become one of the most reliable places to pick up marks.

Physics 6-mark questions test whether you can build a logical argument using scientific principles. They reward structured reasoning far more than raw recall. A student who understands three key ideas and presents them in a clear chain of cause and effect will outscore a student who lists six disconnected facts. That makes exam technique critical.

This guide explains exactly how 6-mark questions are marked, how to plan and write your answers, and provides four full worked examples you can use as models. Whether you are aiming for a grade 5 or a grade 9, the approach here will help you access more of the available marks.

You will find 6-mark questions on both Paper 1 and Paper 2 of your Edexcel GCSE Physics exams (and on the physics sections of the Combined Science papers). Each paper typically includes one or two extended response questions, so mastering this technique is worth a significant number of marks across the qualification.

How 6-Mark Questions Work in Physics

Six-mark extended response questions on Edexcel GCSE Physics papers have several features that set them apart from shorter questions.

They use levels-based marking, not point-based marking. On a 3-mark question, the examiner ticks off individual points and awards one mark per valid point. On a 6-mark question, the examiner reads your entire answer, decides which level it fits, and then assigns a mark within that level. This means the overall quality of your response matters more than the raw number of facts you include.

They are signalled by an asterisk. On Edexcel papers, the question number for an extended response question has an asterisk (*) next to it. When you see that asterisk, you know the question uses levels-based marking and that the quality of your written communication is being assessed.

They use specific command words. Six-mark questions almost always begin with "Explain", "Evaluate", "Compare", "Describe", or "Discuss". The command word tells you what the examiner expects your answer to do. An "Explain" question requires causes and reasons grounded in physics principles. An "Evaluate" question requires a balanced argument with a conclusion. A "Compare" question requires direct side-by-side analysis. Getting the command word wrong is one of the fastest ways to limit your marks.

Quality of written communication is assessed. This means your spelling, grammar, punctuation, and use of scientific terminology all contribute to the level your answer reaches. You do not need perfect prose, but your answer must be coherent and use the correct scientific vocabulary. An answer written as a disjointed list of bullet points, even if the content is accurate, will not reach Level 3.

There is no single correct answer. Unlike a calculation question where there is one right answer, 6-mark questions can be answered in different ways. The mark scheme includes "indicative content" -- a list of points a good answer might cover -- but examiners are instructed to reward any relevant, well-developed response. This means you have flexibility in which points you choose to make, as long as you make them well.

The Three Levels Explained

Every 6-mark question on your Edexcel GCSE Physics paper is marked against three levels. Understanding what each level requires is the key to writing answers that reach the top.

Level 1 (1-2 marks)

A Level 1 answer contains some relevant information but lacks development. It might include basic correct statements, but they are not connected or explained. Scientific vocabulary is limited or absent. The response may read like a list of loosely related facts rather than a coherent answer.

A student writing at Level 1 might state what happens but not explain why in terms of physics. They might mention one or two relevant ideas but fail to develop them or link them together.

For example, a Level 1 answer to a question about why a skydiver reaches terminal velocity might say: "The skydiver falls and goes faster. Air resistance slows them down. They open the parachute and slow down." The points are vaguely relevant but there is no explanation of how forces interact or any use of scientific terminology.

Level 2 (3-4 marks)

A Level 2 answer is mostly relevant and shows some development. The student makes reasonable use of scientific terminology and connects some ideas together. There is a recognisable structure, though it may not be fully logical or complete. Some points are explained, but others remain at the level of description.

A student writing at Level 2 has the right content but has not fully developed it. They might explain two points well but leave a third undeveloped, or they might cover the right ground but miss the logical connections between ideas.

Using the same skydiver question, a Level 2 answer might say: "When the skydiver jumps, gravity pulls them down and they accelerate. Air resistance increases as they go faster. Eventually the forces balance and they reach terminal velocity." The student has used some scientific language and shown understanding, but has not explained why increasing speed leads to increasing air resistance, or connected the force balance to Newton's first law in a sustained way.

Level 3 (5-6 marks)

A Level 3 answer is detailed, well-developed, and follows a clear logical sequence. The student uses correct scientific terminology throughout and sustains a coherent line of reasoning from start to finish. Points are not just stated but explained, and they build on each other. If the question asks for evaluation, there is a supported judgement.

A Level 3 answer to the same question would explain that the skydiver's weight provides an unbalanced downward force, causing acceleration according to Newton's second law. As velocity increases, the drag force due to air resistance increases because the skydiver collides with more air particles per second. Eventually the drag force equals the weight, the resultant force is zero, and the skydiver travels at a constant terminal velocity. The answer would use terms like "resultant force", "Newton's second law", "equilibrium", and "terminal velocity", linking each step in a clear causal chain.

The difference between Level 2 and Level 3 is not about knowing more facts. It is about how well you organise, connect, and develop the facts you know. Three well-developed points with clear reasoning will reach Level 3. Six superficial points without development will not.

It is also worth noting how the examiner decides between the top and bottom of a level. Once they place your answer in a level, they consider whether it sits at the higher or lower end. A strong Level 2 answer scores 4, while a weak Level 2 scores 3. The details matter: an answer that is mostly at Level 2 but includes one particularly well-developed point with precise terminology might be pushed to the top of the level.

How to Plan a 6-Mark Answer

Spending one to two minutes planning before you write is the single most effective thing you can do for a 6-mark question. Students who plan write better answers in less time than students who start writing immediately.

Here is a planning method that works.

Step 1: Identify the command word. Read the question and underline or circle the command word. This determines the type of response you need to write. "Explain" means you need reasons grounded in physics. "Evaluate" means you need arguments for and against, plus a conclusion. "Describe" means you need a clear account of what happens. "Compare" means you need direct comparisons between two things. "Discuss" means you need to explore different aspects of an issue.

Step 2: Jot down three to four key points. In the margin or on your planning space, write down the main ideas you want to include. Do not write full sentences -- just key words or short phrases. Three to four well-chosen points are enough. You do not need six points for six marks.

Step 3: Order them logically. Number your points in the order you will write them. For a process, use chronological order. For an evaluation, group your "for" arguments together, then your "against" arguments, then your conclusion. For a comparison, pair up the features you are comparing.

Step 4: Add scientific terminology. For each point, note the specific scientific terms you will use. This is what separates Level 2 from Level 3. If you are writing about forces, note "resultant force", "Newton's second law", "equilibrium". If you are writing about electricity, note "potential difference", "resistance", "current". If you are writing about energy, note "dissipated", "conservation of energy", "efficiency".

This planning process takes ninety seconds and transforms a rambling answer into a structured one.

One more thing about planning: your plan does not need to be neat. It is for your eyes only. The examiner will not mark it. Scribble key words, draw arrows, use abbreviations -- whatever gets your ideas on paper fastest. The goal is to have a clear roadmap before you start writing so that your answer has direction from the first sentence.

Worked Examples

The following examples show how to plan and write Level 3 answers on common Edexcel GCSE Physics topics.

Example 1: Terminal Velocity

Question: Describe and explain what happens to a skydiver from the moment they jump out of the plane to when they land. (6 marks)

Plan:

• Jump: weight acts downward, no air resistance initially, resultant force downward, accelerates (F = ma)
• Falling: speed increases, air resistance increases, resultant force decreases, acceleration decreases
• Terminal velocity: air resistance equals weight, resultant force is zero, constant velocity
• Parachute opens: surface area increases, air resistance suddenly much greater than weight, decelerates
• New terminal velocity: lower speed, forces balance again at lower velocity, lands safely

Model answer:

When the skydiver first jumps from the plane, the only significant force acting on them is their weight, pulling them downward due to gravity. There is very little air resistance at this point because their velocity is low. The resultant force is therefore large and directed downward, so the skydiver accelerates toward the ground in accordance with Newton's second law (F = ma).

As the skydiver's velocity increases, the force of air resistance acting upward also increases. This is because at higher speeds, the skydiver collides with a greater number of air particles per second, and each collision exerts a greater force. The resultant downward force therefore decreases, which means the skydiver continues to accelerate but at a decreasing rate. Eventually, the air resistance becomes equal to the skydiver's weight. At this point the resultant force is zero, the skydiver is in equilibrium, and they travel at a constant velocity known as terminal velocity.

When the skydiver opens their parachute, the surface area exposed to the air increases dramatically. This causes air resistance to increase suddenly, so it becomes much greater than the skydiver's weight. The resultant force is now directed upward, which causes the skydiver to decelerate. As their speed decreases, air resistance also decreases, until once again air resistance equals weight. The skydiver reaches a new, much lower terminal velocity that is safe enough for landing.

Why this reaches Level 3: The answer follows a clear chronological sequence through the entire event. At every stage, it identifies the forces, explains the resultant force, and connects this to the change in motion using Newton's laws. Scientific terminology (resultant force, equilibrium, terminal velocity, deceleration, Newton's second law) is used accurately and consistently. The reasoning is sustained from the moment of the jump through to landing.

Example 2: Nuclear Power vs Fossil Fuels

Question: Evaluate the advantages and disadvantages of using nuclear power compared to fossil fuels for generating electricity. (6 marks)

Plan:

• Nuclear pros: very low carbon emissions during operation, high energy output per kg of fuel, reliable baseload supply
• Nuclear cons: radioactive waste (long half-life, expensive storage), high construction and decommissioning costs, risk of nuclear accidents, limited uranium supply
• Fossil pros: lower construction costs, well-established technology, reliable output
• Fossil cons: high CO2 emissions (climate change), finite reserves (running out faster), air pollution (SO2, particulates)
• Conclusion: weigh up, come to a judgement

Model answer:

Nuclear power stations have several significant advantages over fossil fuel power stations. During operation, nuclear power stations produce very low carbon dioxide emissions, which means they make a much smaller contribution to climate change than coal, oil, or gas power stations. Nuclear fuel also has a very high energy density -- a small mass of uranium produces an enormous amount of energy compared to the same mass of fossil fuel. Nuclear power stations provide a reliable baseload supply of electricity and can generate power continuously for long periods without interruption.

However, nuclear power has serious disadvantages. The radioactive waste produced during nuclear fission has very long half-lives, meaning it remains hazardous for thousands of years and must be stored securely at considerable expense. The cost of building a nuclear power station is far higher than building a fossil fuel plant, and decommissioning a reactor at the end of its operational life adds further expense. There is also the risk, however small, of a nuclear accident releasing radioactive material into the environment.

Fossil fuel power stations are cheaper to build and use well-established technology, making them a reliable and proven energy source. However, burning fossil fuels releases large quantities of carbon dioxide, the main greenhouse gas driving climate change, as well as sulfur dioxide and particulate matter, which cause air pollution and acid rain. Fossil fuel reserves are also finite and are being consumed at an increasing rate.

On balance, nuclear power is the stronger option for long-term electricity generation. While the challenges of waste storage and high costs are significant, the environmental damage caused by fossil fuel emissions is far more widespread and difficult to reverse. As the need to reduce carbon emissions becomes more urgent, nuclear power offers a low-carbon alternative that can provide reliable baseload electricity.

Why this reaches Level 3: The answer presents a balanced evaluation with clearly developed points on both sides. Scientific reasoning is used throughout (energy density, half-life, greenhouse gases, carbon emissions). The response ends with a supported judgement that weighs the evidence, which is essential for any "Evaluate" question. Both energy sources are assessed on their merits, and the conclusion follows logically from the arguments presented.

Example 3: The National Grid

Question: Explain how the National Grid transmits electrical energy efficiently from power stations to homes. (6 marks)

Plan:

• Power station generates electricity, voltage stepped up by step-up transformer
• Transmitted at high voltage and low current through overhead cables
• Why: power loss in cables = I squared R; low current means less energy dissipated as heat
• Step-down transformer reduces voltage to safe level (230 V) for domestic use
• Reference P = IV to show same power transmitted at lower current when voltage is higher

Model answer:

Electrical energy generated at power stations must be transmitted over long distances through the National Grid to reach homes and businesses. The key challenge is transmitting this energy efficiently, because the cables that carry the electricity have resistance and therefore dissipate energy as heat.

At the power station, a step-up transformer increases the voltage from the generation voltage (typically around 25,000 V) to extremely high values, up to 400,000 V, for transmission across the country. Since the power transmitted is given by P = IV, increasing the voltage means the same power can be transmitted at a much lower current. This reduction in current is critical for efficiency, because the energy dissipated as heat in the transmission cables is given by P = I squared R. A lower current means significantly less energy is wasted as heat in the cables, even though the resistance of the cables remains the same.

The electricity is carried across the country by overhead cables supported on pylons. When the electricity reaches towns and cities, step-down transformers reduce the voltage in stages -- first to intermediate values for industrial use, and finally to 230 V for safe domestic use in homes.

Without transformers, the National Grid would either need to transmit at low voltage with very high current, wasting enormous amounts of energy as heat, or use cables with impractically low resistance. Transformers make efficient long-distance transmission possible by allowing the voltage to be changed while keeping the power approximately constant.

Why this reaches Level 3: The answer explains the purpose of each component of the National Grid and links them together in a logical sequence. The key physics is clearly stated: the relationship between power, voltage, and current (P = IV) and the equation for power loss in the cables (P = I squared R). The answer does not just describe the system but explains why it works the way it does, connecting the use of high voltage to the reduction in current and therefore the reduction in energy loss.

Example 4: Types of Radiation

Question: Compare the properties and uses of alpha, beta and gamma radiation. (6 marks)

Plan:

• Nature: alpha (2p + 2n, helium nucleus), beta (fast electron from nucleus), gamma (electromagnetic wave)
• Penetrating power: alpha stopped by paper/skin, beta stopped by aluminium, gamma only reduced by thick lead/concrete
• Ionising ability: alpha most ionising, gamma least ionising -- inverse relationship with penetrating power
• Range in air: alpha a few cm, beta tens of cm, gamma several metres
• Uses linked to properties: alpha in smoke detectors, beta in thickness monitoring, gamma in medical imaging/sterilisation/cancer treatment

Model answer:

Alpha, beta, and gamma radiation differ significantly in their nature, penetrating power, ionising ability, and applications.

Alpha particles consist of two protons and two neutrons -- essentially a helium nucleus. They are relatively large and carry a charge of +2. Because of their large size and high charge, alpha particles interact strongly with atoms in the material they pass through, making them the most ionising form of radiation. However, this also means they lose energy quickly and have the lowest penetrating power. Alpha particles are stopped by a few centimetres of air, a sheet of paper, or the outer layer of skin. Beta particles, in contrast, are fast-moving electrons emitted from the nucleus when a neutron decays into a proton. They are much smaller and carry a charge of -1, so they are less ionising than alpha particles but more penetrating. Beta particles can travel through air for tens of centimetres and pass through paper, but are absorbed by a few millimetres of aluminium. Gamma rays are electromagnetic waves with very high frequency and no mass or charge. They are the least ionising form of radiation, whereas they are the most penetrating, passing through most materials and only being significantly attenuated by thick lead or several metres of concrete.

There is a clear inverse relationship between ionising ability and penetrating power: the more ionising the radiation, the more quickly it transfers its energy to surrounding atoms and the less far it travels.

The uses of each type of radiation are directly related to their properties. Alpha radiation is used in smoke detectors because its very short range means it is easily absorbed by smoke particles, triggering the alarm. Beta radiation is used in thickness monitoring of materials such as paper or metal sheets during manufacturing, because beta particles are partially absorbed by thin materials, allowing changes in thickness to be detected. Gamma radiation is used in medical imaging and in the treatment of cancer, because its high penetrating power allows it to pass into or through the body. Gamma rays are also used to sterilise surgical instruments, as they can penetrate packaging to destroy bacteria without damaging the equipment inside.

Why this reaches Level 3: The answer makes direct comparisons throughout, using connective language ("in contrast", "whereas", "however") rather than describing each type of radiation in isolation. It explicitly identifies the inverse relationship between ionising ability and penetrating power, showing understanding rather than just recall. The uses are linked back to the specific properties that make each type of radiation suitable for the application. Scientific terminology (ionising, penetrating power, electromagnetic wave, attenuated, half-life) is used precisely throughout.

Common Mistakes on 6-Mark Questions

These are the errors that consistently prevent students from reaching Level 3.

Writing a list of bullet points. Levels-based marking rewards connected, developed prose. A list of six separate bullet points, even if each one is correct, reads as Level 1 or Level 2 because there is no sustained line of reasoning. Write in paragraphs and link your ideas together.

Forgetting to use scientific terminology. The level descriptors explicitly reward correct use of scientific vocabulary. Writing "the thing speeds up" instead of "the object accelerates due to the resultant force" costs you. Writing "the wire gets hot" instead of "energy is dissipated as heat in the resistor due to the current flowing through it" costs you. Every time you can use the precise scientific term, use it.

Not answering the actual question. Read the question again after planning and again after writing. If the question asks you to explain why something happens, do not describe the observations you would see. If it asks you to compare two things, do not write about each one separately without making direct connections between them.

Only covering one side of an evaluation. If the question says "Evaluate", the examiner expects arguments for and against, followed by a conclusion. Writing only about advantages, no matter how detailed, limits you to a maximum of Level 2. You must address both sides and reach a supported judgement.

Not including a conclusion for evaluate or discuss questions. The Level 3 descriptor for evaluation questions requires a supported judgement. Forgetting to write a concluding sentence that weighs up the evidence and states your overall position means you cannot access the top marks, even if everything else in your answer is excellent.

Running out of time because of poor planning. Students who start writing immediately often realise halfway through that their answer is going in the wrong direction. They cross out and start again, or they write too much on one point and have no time left for others. A one-minute plan prevents this entirely.

Repeating the same point in different words. Writing "the current increases so the wire gets hotter" and then writing "more electricity flows so the temperature goes up" does not count as two separate points. The examiner will credit the idea once. Make sure each paragraph adds a genuinely new idea to your answer.

Not linking cause to effect. Many Level 2 answers state correct facts but do not connect them. Saying "the resistance increases" and "the current decreases" as two separate sentences is weaker than writing "as the resistance of the component increases, the current through the circuit decreases because, at constant voltage, V = IR means a higher resistance results in a lower current." The linking words -- "so", "therefore", "because", "as a result", "this means that" -- are what turn a list of facts into a chain of reasoning.

Scientific Vocabulary That Scores Marks

Examiners are specifically looking for correct use of scientific terminology. Here are key physics terms that appear frequently in 6-mark mark schemes and level descriptors. Using them accurately signals to the examiner that your understanding is at Level 3.

Forces and motion: resultant force, equilibrium, inertia, deceleration, terminal velocity, Newton's first/second/third law, momentum, impulse, friction, drag, normal contact force.

Energy: dissipated, conservation of energy, efficiency, kinetic energy, gravitational potential energy, elastic potential energy, thermal energy store, specific heat capacity, specific latent heat, power.

Waves: transverse, longitudinal, amplitude, frequency, wavelength, refraction, diffraction, reflection, absorption, transmission, electromagnetic spectrum, total internal reflection.

Electricity: resistance, potential difference, current, charge, Ohm's law, series, parallel, direct current, alternating current, power dissipation, National Grid, transformer.

Radioactivity: ionising radiation, penetrating power, half-life, contamination, irradiation, alpha decay, beta decay, gamma emission, nuclear fission, chain reaction, background radiation.

Space and astronomy: red shift, cosmic microwave background radiation, Big Bang theory, orbital speed, gravitational field strength, light year, galaxy.

You do not need to force these terms into your answer. But wherever a scientific term is the precise way to express an idea, use it instead of the everyday alternative. "The resultant force is zero so the object is in equilibrium" is better than "the forces balance so it stays the same." "Energy is dissipated to the thermal energy store of the surroundings" is better than "the energy is lost as heat."

A useful exercise during revision is to take a topic and list every scientific term associated with it. Then practise writing a paragraph that uses each term correctly in context. This builds the habit of reaching for precise language automatically, so you do not have to think about it under exam conditions.

Time Management

You should spend approximately eight to ten minutes on a 6-mark question, including planning time. Here is how to allocate that time.

Planning (1-2 minutes). Read the question, identify the command word, jot down your key points, order them logically, and note the scientific terms you will use.

Writing (5-7 minutes). Write your answer in full paragraphs, following your plan. Develop each point rather than listing many points briefly. Three well-developed points are better than six shallow ones.

Checking (1 minute). Re-read your answer against the question. Have you answered what was actually asked? Have you used scientific terminology? If the question says "Evaluate", have you included a conclusion? If it says "Compare", have you made direct comparisons? This final check often catches errors that would drop you a level.

Do not write more than you need to. A concise, well-structured answer of three to four paragraphs is better than a sprawling response that repeats the same points in different words. The examiner is looking for quality and coherence, not length.

If you find yourself running over ten minutes on a 6-mark question, something has gone wrong. Either your plan was not focused enough, or you are including unnecessary detail. Remember that each Physics paper has many other questions that also need your time. A strong 6-mark answer written efficiently leaves you time to pick up straightforward marks elsewhere on the paper.

One practical tip: during timed practice, note how long your 6-mark answers take. If you consistently go over ten minutes, practise writing more concisely. If you finish in under six minutes, check whether your answers are developed enough to reach Level 3.

Practice Strategy

The best way to improve on 6-mark questions is deliberate, targeted practice. Here is an approach that works.

Start by writing answers to past paper 6-mark questions under timed conditions. Give yourself ten minutes per question. After writing, mark your own answer against the official mark scheme and level descriptors. Be honest about which level your answer reaches and why.

If you consistently land at Level 2, look for the pattern. Is it a lack of scientific terminology? Is it poor structure? Are you failing to link cause to effect? Once you identify the specific weakness, you can target it.

A particularly effective technique is to rewrite your Level 2 answers as Level 3 answers, focusing specifically on the gap you identified. This forces you to practise the exact skill you are missing, rather than just writing more answers and hoping to improve.

You can also study the model answers in mark schemes. Edexcel mark schemes include indicative content for 6-mark questions, listing the kinds of points a good answer might include. While the indicative content is not a checklist -- you do not need to include everything listed, and you can earn full marks with valid points not on the list -- it gives you a clear picture of the depth and terminology the examiners expect.

Physics 6-mark questions often involve explaining processes or describing how quantities change over time. Practising these chronological or sequential answers is especially valuable, because the structure of the answer must mirror the structure of the process. If you can master the art of walking through a physical process step by step -- identifying forces, energy transfers, or changes in variables at each stage -- you will be well prepared for the most common types of extended response question.

Aim to practise at least one 6-mark question per week in the months before your exams. By exam day, the planning and writing process should feel automatic. You should not be thinking about technique during the exam -- you should be thinking about physics, with the technique running in the background as a well-practised habit.

Putting It All Together

Six-mark questions are not a test of how much you know. They are a test of how well you can organise, express, and develop what you know using the language of physics. A student who understands levels-based marking and plans their answer will consistently outperform a student who knows more physics but writes without structure.

The formula is straightforward: read the command word, plan three to four key points, write in connected paragraphs using scientific terminology, and check that your answer addresses the question. Do this consistently, and Level 3 becomes the norm rather than the exception.

Every mark on a 6-mark question is earned through clear communication of physics, not through guesswork or volume. The students who score highest are not always the ones who know the most -- they are the ones who present what they know most effectively. That is a skill you can develop with practice, and it transfers directly to every extended response question you will face.

For more on how Edexcel marks extended responses, read our guide to how Edexcel mark schemes work. To master the command words that appear on your papers, see Edexcel GCSE exam command words explained. For a broader overview of Edexcel GCSE Physics content, visit our Edexcel GCSE Physics revision guide.

LearningBro's Edexcel GCSE Physics courses include exam-style 6-mark questions with model answers, helping you build the planning and writing habits that lead to Level 3 responses on exam day.

Good luck with your revision. The 6-mark question is not something to fear -- it is an opportunity to show the examiner what you really understand.