IB Physics Paper 1 and Paper 2: A Strategy That Works

Paper 1A: multiple choice, and the clock

At HL you have 40 multiple-choice questions inside a paper that also contains the 20-mark data section, in two hours total. That is well under two minutes a question if you want time left for Paper 1B, and the questions are not ordered by difficulty.

The strategy that works is triage. Go through once and answer everything you can do confidently, marking anything that needs real work. Come back to the marked ones. What loses marks is spending four minutes on question 7 and then rushing questions 30 to 40, which are often easier.

Because there is no negative marking, every question must have an answer before you stop. Eliminate what you can — most IB multiple-choice items have at least one option that is dimensionally wrong or an order of magnitude out — then commit.

One habit worth building: check units and magnitude on the options before calculating. It frequently eliminates two of the four without any physics at all.

Paper 1B: the data section is the most trainable part of the course

Paper 1B is 20 marks of data-based work, and it rewards a skill set rather than recall — which makes it the most reliably improvable part of the paper.

• Gradients. Read them off the line of best fit, not off two data points, and always state the units.
• Linearisation. Expect to be asked what to plot to get a straight line. Rearranging the relationship into y = mx + c form and identifying what the gradient represents is a standard question type.
• Uncertainties. Absolute versus percentage, propagation through products and powers, and error bars. Know the rules cold; they come up every session.
• Reading the axes. Scales with powers of ten in the axis label cause more lost marks than the physics does.

If you are systematically dropping marks here, this is the highest-return revision you can do, because the same handful of skills recurs regardless of which theme the data comes from.

Paper 2: short answers are about precision

Paper 2 carries 44% and is where most of the marks in the course sit. The short-answer questions punish vagueness more than they punish gaps in knowledge.

• Read the command term. “State” wants one line. “Explain” wants a mechanism. “Compare” wants both sides in the same sentence. Answering a different command term than the one asked is a common and entirely avoidable loss.
• Show the working. Method marks are available even when the final number is wrong, but only if the working is visible. A bare answer that is wrong scores zero where the same attempt written out might score two of three.
• Watch the mark allocation. Three marks means three distinct points. If you have written one sentence for a three-mark question, you have not finished.
• Carry units and significant figures through. They are marked, and they are free.

The extended response

Paper 2 contains at least one longer question requiring a connected argument. These reward structure over volume.

The approach that scores: answer the question asked in the first sentence, then justify it in ordered steps, each step following from the last. Write the physics, not an essay about the physics. Where a diagram would carry the explanation faster than prose, draw it and label it.

The failure mode is writing everything you know about the topic in the hope that the marks are in there somewhere. Examiners mark against specific points; an unstructured brain dump often contains them but buries them, and it costs the time you needed for the questions after it.

The data booklet, and where time actually goes

The data booklet is provided, and fluency with it is worth minutes across a paper. Know which section holds which relationship and which form of an equation you need, so that looking something up costs seconds rather than a search. Practise with it from the start of the course rather than meeting it in the final month, and confirm the current assessment structure on the IB’s physics page — it changes between syllabus cycles.

Where students actually lose time:

• Recalculating something already worked out earlier in the same question.
• Hunting the booklet for an equation they half-remember.
• Re-reading a long stem three times instead of annotating it once.
• Refusing to move on from a question they are convinced they can get.

All four are habits, and habits are trainable under timed conditions — which is the argument for doing full papers to time far earlier than feels comfortable. If it would help to work through this with someone, one-to-one Physics tutoring covers exactly this alongside the content, and the honest answer on how hard HL is sets out where the difficulty really sits.

Frequently asked questions

How long is IB Physics Paper 1?

2 hours at HL and 1 hour 30 at SL. It is sat as two booklets in one sitting: Paper 1A, which is multiple choice with 40 questions at HL and 30 at SL, and Paper 1B, which is data-based and worth 20 marks. Together they are 36% of the grade.

How much is IB Physics Paper 2 worth?

44% of the final grade, making it the largest single component. It runs 2 hours 30 at HL and 1 hour 30 at SL, and combines data-based questions, short answers and at least one extended response.

Is there a penalty for wrong answers in IB Physics?

No. There is no negative marking, so an unanswered multiple-choice question is a wasted mark. Eliminate the options that are dimensionally wrong or an order of magnitude out, then answer every question before time runs out.

How do you revise for IB Physics Paper 1B?

Drill the skills rather than the content: reading gradients off a line of best fit, linearising a relationship into y = mx + c and identifying what the gradient represents, propagating absolute and percentage uncertainties, and reading axes whose labels carry powers of ten. The same skills recur regardless of the theme.

How should I structure an extended response in Physics Paper 2?

Answer the question in the first sentence, then justify it in ordered steps that each follow from the last. Match the number of distinct points to the mark allocation, show working so method marks are available, and use a labelled diagram where it explains faster than prose.

What do IB Physics command terms mean?

They set how much is wanted. State asks for a single line with no justification, explain asks for a mechanism or reason, compare asks for both sides addressed together, and describe asks for the features without the underlying reason. Answering a different command term than the one asked is one of the most avoidable losses on the paper.

Can you use a calculator in IB Physics?

Yes, in both papers, and the data booklet is provided throughout. Fluency with the booklet matters more than most students expect: knowing where a relationship sits and which form of it you need saves minutes across a paper.