Physics Revision
How to Approach True or False Questions in the FRCR Physics Exam
The First FRCR Physics examination is unlike most postgraduate medical exams. Rather than selecting a single best answer, you are presented with forty question stems, each containing five independent statements that must be judged as either true or false. That means making 200 individual decisions in just two hours.
The challenge is not simply knowing the physics. It is applying that knowledge accurately under time pressure.
Candidates who perform well are not necessarily those who know the most. They are usually those who approach every statement in a consistent, disciplined way. Here are the strategies that can make a real difference.
Treat Every Statement Independently
One of the most common mistakes is allowing your answer to one statement to influence the next.
Each statement is an independent question. Whether statement (a) is true tells you nothing about statements (b), (c), (d) or (e). The Royal College makes it clear that any combination of true and false answers is possible, including all five being true or all five being false.
Develop the habit of mentally resetting after every statement. Read it, answer it, then move on without looking for patterns.
Read Every Word Carefully
Many marks are lost because candidates misread the question rather than misunderstand the physics.
Pay particular attention to words such as:
- Always
- Never
- Only
- Except
- Not
- Greater than
- Less than
- Increases
- Decreases
A single word can completely change the meaning of a statement. Before committing to an answer, make sure you know exactly what is being asked.
Remember That Every Part Must Be Correct
A statement is only true if every part of it is true.
For example:
MRI uses non ionising radiation and is contraindicated in all patients with pacemakers.
The first part is correct. The second is not universally true. The entire statement is therefore false.
Do not stop analysing once you recognise something familiar. Read the whole statement before making your decision.
Avoid Making Assumptions
Doctors are trained to think about clinical context, but physics questions reward precision.
Answer the statement exactly as it is written. Avoid adding information that is not there or imagining unusual clinical scenarios. The simplest interpretation is often the correct one.
Understand the Physics Rather Than Memorising Isolated Facts
Not every question relies on factual recall. Many can be answered by working logically through the underlying physics.
If you cannot immediately remember the answer, think about the basic principles.
For example:
- If attenuation increases, what happens to detector exposure?
- If detector exposure falls, what happens to image noise?
- If tube current increases, what happens to patient dose?
Working from first principles will often lead you to the correct answer even when your memory is uncertain.
Learn the High Yield Facts
Some topics simply need to be known.
These include:
- Radiation legislation
- Radiation units
- Dose limits
- Half lives
- Quality assurance tests
- MRI terminology
- Ultrasound artefacts
These areas appear frequently because they lend themselves well to true or false statements. They are ideal topics for flashcards and regular spaced repetition.
Learn From Every Incorrect Answer
Completing practice questions is only half of the revision process. The real learning happens afterwards.
When reviewing an incorrect answer, ask yourself:
- Which concept did I misunderstand?
- Was there a key word that I missed?
- Would I recognise this mistake next time?
- Can I summarise the correct principle in one sentence?
This approach is far more effective than simply reading the explanation and moving on.
Be Wary of Statements That Are Almost Correct
Many FRCR Physics questions contain statements that are largely correct but include one important error.
Watch for statements that contain:
- The correct principle but the wrong imaging modality
- The correct value but the wrong unit
- The correct concept but the wrong direction
- An absolute word such as "always" or "never"
These are designed to test careful reading as much as factual knowledge.
Manage Your Time
With forty question stems in two hours, you have an average of around three minutes per question.
If a statement is taking too long, make your best judgement and move on. Spending excessive time on one difficult question often costs more marks elsewhere.
If your practice platform allows you to flag questions for review, use it. Returning later with a fresh perspective often makes the answer much clearer.
Never Leave a Statement Blank
The examination does not use negative marking.
If you genuinely do not know the answer, make your best judgement rather than leaving it unanswered. An educated guess always gives you a chance of gaining a mark.
Practise Under Exam Conditions
Reading textbooks is important, but success in the examination comes from answering large numbers of questions.
Many successful candidates report a similar revision strategy:
- Build a solid understanding of the core physics.
- Complete large numbers of practice questions.
- Review every incorrect answer carefully.
- Revisit weak topics regularly.
- Complete full timed mock examinations in the weeks before the exam.
This process develops both knowledge and exam technique, which are equally important on the day.
Final Thoughts
The true or false format can seem intimidating at first, but it rewards a calm and methodical approach.
Treat every statement as a separate question. Read carefully, avoid making assumptions and rely on the underlying physics whenever possible. Most importantly, learn from every mistake you make during revision.
The candidates who improve the fastest are rarely those who spend the most time reading textbooks. They are usually the ones who repeatedly test themselves, review their errors and gradually build the judgement needed to make 200 accurate decisions under pressure.
By the time you sit the examination, answering true or false questions should feel like a familiar routine rather than an obstacle.