Mastering Exam Command Words in GCSE Maths and Physics

Decoding the Language of Exams

Every GCSE maths and physics paper is written with a specific set of instructions known as command words. These words are not just filler; they are the key to unlocking the marks available for each question. Many students lose valuable points not because they lack knowledge, but because they fail to answer the specific task requested. By understanding exactly what an examiner wants when they use terms like 'describe' or 'explain', you can tailor your answers to meet the mark scheme requirements precisely.

In this guide, we will break down the most common command words you will encounter. Mastering these will transform your exam technique, ensuring you provide the right level of detail and the correct format for every question you face.

State, Name, and Give

These are the most straightforward command words. They require you to recall a specific fact, definition, or equation from memory. You do not need to provide long, complex sentences; in fact, being concise is often better.

• Example: "State the unit of electrical resistance."
• Answer: Ohms (or $\Omega$).

When you see these words, do not waste time writing an essay. Provide the exact piece of information requested and move on to the next question.

Describe vs. Explain

This is the most common area where students lose marks. A 'describe' question asks you to say what happens or what you see, often involving a trend or a process. An 'explain' question requires you to say why something happens, linking it to scientific principles.

• Describe: Focus on the 'what'. If looking at a graph, describe the trend (e.g., "As the temperature increases, the rate of reaction increases").
• Explain: Focus on the 'why'. You must use scientific theory (e.g., "As the temperature increases, particles have more kinetic energy, leading to more frequent successful collisions").

Calculate and Determine

These command words signal that you must use mathematical skills. You will often be provided with data or a formula. Crucially, you must show your working out. Even if your final answer is incorrect, you can often pick up 'method marks' for showing the correct steps.

Worked Example 1 (Calculate): Calculate the kinetic energy of a car with a mass of $1000\text{ kg}$ moving at $20\text{ m/s}$.

1. Identify the formula: $E_k = \frac{1}{2}mv^2$
2. Substitute the values: $E_k = 0.5 \times 1000 \times (20)^2$
3. Calculate: $E_k = 0.5 \times 1000 \times 400$
4. Final Answer: $200,000\text{ J}$

Worked Example 2 (Determine): Determine the gradient of the line on a distance-time graph where the distance changes by $50\text{ m}$ over $10\text{ seconds}$.

1. Identify the formula: $\text{Gradient} = \frac{\text{change in } y}{\text{change in } x} = \frac{\text{distance}}{\text{time}}$
2. Substitute: $\text{Gradient} = \frac{50}{10}$
3. Final Answer: $5\text{ m/s}$

Compare

When asked to 'compare', you must identify both similarities and differences. Do not just write about one object or process; you must explicitly link them. Use comparative language such as 'whereas', 'however', or 'both'.

Common Mistakes

1. Ignoring the command word: Skimming the question and missing the difference between 'describe' and 'explain' is the most frequent cause of lost marks.
2. Not showing working: In 'calculate' questions, writing only the final answer is a gamble. If you make a small calculator error, you lose all marks instead of gaining method marks.
3. Missing units: In physics, a numerical answer without a unit is often incomplete. Always check if your answer requires a unit like Newtons, Joules, or Amps.
4. Over-answering: Writing a paragraph for a 'state' question wastes time that could be spent on more challenging, higher-mark questions.

Frequently Asked Questions

Q: Does 'show that' mean I need to calculate the answer? Yes, 'show that' questions require you to prove a value is correct by performing the calculation yourself. You must show every step of your working clearly.

Q: What if I run out of space? If you need more space, use the additional answer booklets provided by the exam centre and clearly label your work with the question number.

Q: Do I need to use a ruler for 'sketch' questions? Yes, even for a sketch, you should use a ruler for straight lines and ensure your axes are labelled correctly, even if the graph is not plotted to exact scale.

Conclusion

Understanding command words is a vital skill that bridges the gap between knowing your physics and achieving your potential. By identifying these instructions early, you can structure your answers to satisfy the examiner's requirements every time. To see these concepts in action, head over to MathInstructor AI to generate a free, narrated animated lesson on this topic and master your exam technique today.