IB Physics Paper 1 vs Paper 2 Explained

For the current IB Physics course, first assessed in 2025, Paper 1 tests rapid problem-solving and data analysis, while Paper 2 tests structured reasoning, complete calculations and extended explanations. Paper 1 is divided into Paper 1A, containing multiple-choice questions, and Paper 1B, containing data-based questions. Paper 2 contains short-answer and extended-response questions.

Both papers can assess content from across the course, so the distinction is mainly about how you use your physics knowledge, not which topics you revise. Effective preparation therefore requires separate practice for multiple-choice decisions, experimental data analysis and written multi-step solutions.

IB Physics Paper 1 vs Paper 2 at a glance

The following structure applies to the syllabus introduced for first teaching in 2023 and first assessment in 2025. The IB confirms that both SL and HL students sit two external examinations, with Paper 1A and Paper 1B completed as parts of the same Paper 1 session.

A calculator and a clean physics data booklet are required for Papers 1 and 2, as shown in the official IB specimen papers. There is no negative marking on Paper 1A, so an incorrect answer does not remove a mark earned elsewhere.

What IB Physics Paper 1 tests

Paper 1 is presented in two separate booklets, but Paper 1A and Paper 1B are completed together without an interruption. They test noticeably different forms of thinking, so treating Paper 1 as one uniform paper is a preparation mistake.

Paper 1A: multiple-choice reasoning

Paper 1A asks you to choose the best answer from the available options. Some questions can be solved through a short calculation, while others depend on conceptual understanding, estimation, proportional reasoning or recognition of a physical relationship.

The distractors are often based on predictable errors, such as:

• using diameter instead of radius
• confusing a vector with its magnitude
• reversing a proportional relationship
• omitting a unit conversion
• substituting into an equation that does not match the situation
• interpreting a graph's gradient when its area is required

Success therefore depends on more than recalling formulas. You must identify the physical model quickly, reject answers that are dimensionally or conceptually impossible and calculate accurately without developing an unnecessarily long solution.

Because there is no penalty for an incorrect response, you should answer every question. Eliminate impossible options first and make a reasoned choice if time is running out. However, guessing should be a final step, not the main strategy.

Paper 1B: data-based physics

Paper 1B assesses how well you can extract meaning from experimental information. According to the IB's current Physics curriculum update, Paper 1B provides opportunities to assess skills involving graphing, units and uncertainties.

Typical tasks may require you to:

• identify variables or trends
• calculate a gradient or intercept
• use error bars or uncertainty information
• transform data to test a proposed relationship
• compare experimental results with a theoretical model
• recognize anomalous data
• evaluate whether evidence supports a conclusion
• suggest a physically realistic improvement to a method

For example, if a graph of force against extension is linear, you may need to calculate the spring constant from its gradient. A stronger response states how the gradient was obtained, includes appropriate units and connects the result to the physical model. Simply copying two nearby plotted values can produce a less reliable gradient than using points far apart on a best-fit line.

What IB Physics Paper 2 tests

Paper 2 contains short-answer and extended-response questions. The paper begins with questions focused on narrower areas of the curriculum and ends with extended material that can connect different parts of the course. The IB states that SL finishes with one extended-response question, while HL finishes with two.

Paper 2 commonly tests your ability to:

• select and apply an appropriate principle
• show a logical sequence of calculations
• explain physical behaviour using precise terminology
• interpret diagrams, graphs and unfamiliar contexts
• combine ideas from more than one topic
• maintain correct units, signs and significant figures
• justify assumptions or conclusions

Unlike Paper 1A, Paper 2 awards marks for the reasoning visible in your response. A correct final number with no working may fail to earn all available marks, while a student who chooses the correct method but makes a later arithmetic error may still receive method credit.

What a strong Paper 2 calculation looks like

Suppose a question asks for the speed of an object after gravitational potential energy is converted into kinetic energy. A clear solution would:

1. State or use the relevant relationship, such as $mgh = \frac{1}{2}mv^2$.
2. Substitute values consistently in SI units.
3. Rearrange correctly and show enough working to make the method visible.
4. Give the final answer with a unit and sensible precision.
5. Check whether the magnitude is physically plausible.

Paper 2 explanations require the same discipline. If asked why pressure increases at constant volume when a gas is heated, saying only that “the particles move faster” is incomplete. A developed response connects increased molecular kinetic energy to more frequent or more forceful collisions with the container walls, producing a greater force per unit area.

The difference between SL and HL

SL and HL use the same overall assessment structure and weightings, but HL covers additional syllabus material and requires longer examinations. HL Paper 1A contains 40 questions rather than 25, although Paper 1B remains worth 20 marks at both levels.

HL Paper 2 is substantially longer, with 90 marks in 2 hours 30 minutes, compared with 55 marks in 1 hour 30 minutes at SL. HL students must also handle additional higher level content and two extended-response questions. This makes sustained concentration, cross-topic reasoning and careful time management particularly important at HL.

Students using older resources should note that Paper 3 is not part of the current course. Option topics were removed when the revised course was introduced, as explained on the official IB Physics subject page.

How to prepare for Paper 1A

Paper 1A preparation should develop speed without sacrificing reasoning. Start with untimed topic practice, then introduce mixed and timed sets once your accuracy is stable.

Use this process after each question:

1. Identify the principle that the question tested.
2. Explain why the correct option is correct.
3. Explain why each distractor is wrong.
4. Record whether the error involved knowledge, interpretation, algebra or time pressure.
5. Reattempt the question later without looking at the options first.

The RevisionDojo IB Physics Questionbank can be used to target weak areas before moving to mixed practice. For example, students who repeatedly miss mechanics questions can work through the Space, Time and Motion question collection rather than repeatedly sitting entire papers.

How to prepare for Paper 1B

Data skills improve through active analysis, not by memorizing definitions of uncertainty. Practise plotting graphs, calculating gradients, interpreting intercepts and deciding whether results support a model.

When reviewing a Paper 1B response, ask:

• Did I use the data rather than make a general claim?
• Did I quote values when comparing results?
• Did I include units and uncertainties where required?
• Did I distinguish random uncertainty from systematic error?
• Was my suggested improvement specific to the method?

A vague suggestion such as “use better equipment” rarely demonstrates much understanding. A more useful answer identifies the instrument, explains the limitation and states how the change improves the measurement. Reviewing IB Physics worked video solutions helps reveal how successful data responses connect evidence, calculations and conclusions.

How to prepare for Paper 2

Paper 2 practice should focus on communicating complete physical reasoning. Begin by answering questions without strict timing, then compare your work line by line with the markscheme or a reliable worked solution.

Do not only check whether your final answer matches. Look for differences in:

• the equation or principle selected
• the amount of working shown
• the use of command terms
• the precision of written explanations
• units, vector directions and significant figures
• the connection between separate parts of a question

Create an error log with separate categories for conceptual errors, equation selection, algebra, units, explanations and missed information. Jojo AI can help you examine why an answer is incomplete, but you should still compare your wording with the mark allocation and verify the underlying physics.

Once individual skills are secure, use full timed practice. RevisionDojo's IB Physics predicted papers provide paper-specific practice with questions, markschemes and model responses. Your school can also provide appropriately licensed past examination materials.

Time management and exam technique

The IB specifies the total examination time, but it does not require you to divide that time equally among questions. A practical approach is to monitor time in relation to marks while preserving a short period for checking.

For Paper 1:

• avoid allowing one difficult multiple-choice question to consume several minutes
• preserve enough time for the 20-mark data section
• mark uncertain questions and return to them if time remains
• answer every Paper 1A question because there is no negative marking

For Paper 2:

• use the mark allocation to judge the expected depth
• write the relevant principle before substituting numbers
• continue after a difficult part because later parts may still be accessible
• leave space and return rather than abandoning an entire question
• check units, powers of ten and calculator mode at the end

These are recommendations rather than official IB rules. Test any timing plan under realistic conditions before using it in the examination.

Common preparation mistakes

One common mistake is revising content without practising the form in which it will be assessed. Knowing an equation does not guarantee that you can recognize it quickly in Paper 1A, apply it to experimental data in Paper 1B or justify it in a Paper 2 derivation.

Other avoidable errors include:

• using old-format papers without accounting for syllabus changes
• treating Paper 1B as ordinary calculation practice
• writing minimal Paper 2 working because the calculator produced the answer
• memorizing markscheme phrases without understanding them
• practising only preferred topics
• reading worked solutions passively instead of reattempting the question

The most effective review asks why one response earns more marks than another. Per-question video solutions are particularly useful because they expose equation selection, interpretation and presentation choices that a brief markscheme may not fully explain.

Conclusion

In the comparison of IB Physics Paper 1 vs Paper 2, Paper 1A emphasizes fast multiple-choice reasoning, Paper 1B emphasizes data and experimental analysis, and Paper 2 emphasizes structured calculations and extended scientific explanations. Both SL and HL students need all three skill sets, although HL examinations contain more material and longer written demands.

Prepare for each component separately before combining them in timed papers. Use the RevisionDojo Physics hub to move from targeted Questionbank practice to mock papers, then review each response through the per-question Physics video solutions and Jojo AI feedback.

Sources and referenced URLs

• IB Physics higher and standard level specimen papers for first examinations in 2025
• Official IB Physics curriculum updates
• Official IB Physics subject page
• RevisionDojo IB Physics resources
• RevisionDojo IB Physics Questionbank
• RevisionDojo Space, Time and Motion Questionbank
• RevisionDojo IB Physics video solutions
• RevisionDojo IB Physics predicted papers