1. A pH meter is calibrated against a standard solution at the start of a morning. By midday, checks against the same standard show the meter reading has drifted upward by 0.3 pH units, and the drift grew steadily through the morning. Twenty samples were measured across the morning. What is the best way to deal with this?
ICAS Science Paper F (Year 8)
Paper F is sat by Year 8 students and is the hardest Science paper in the range. Forty questions in 60 minutes, four options each.
Last updated: 5 October 2026
What makes it hard
Not the content. Year 8 science is not the obstacle — plenty of Paper F questions sit on material a Year 6 student would recognise.
What separates results is evaluation. Earlier papers ask what an experiment shows. Paper F asks whether it shows it well: was the method sound, is that sample big enough, does this conclusion actually follow, what would you change and why.
Those are the questions with no equivalent in most Year 8 classrooms, where experiments are usually run to demonstrate a known result rather than to be criticised.
What Year 8 content provides
Cells and body systems, chemical change, energy transfer and transformation, and the rock cycle. Contexts again — the reasoning demand is what has moved.
Where marks go
- Method evaluation — spotting the flaw in an experiment that looks reasonable
- Explaining an anomaly rather than dismissing it
- Distinguishing correlation from cause, which Paper F asks in forms that are genuinely subtle
- Options that are each partly right. By this level the four choices are often four defensible readings, and the answer is the one the evidence supports most fully rather than the only true one.
- Pace. Forty dense questions in an hour leaves little spare.
What the mark will look like
ICAS marks run lower than school tests by design. The paper keeps stretching students well past year level, so a result that looks disappointing on a school scale can be a strong ICAS result — read it against the distribution rather than as a percentage.
How to prepare for Paper F
Practise criticising experiments rather than performing them. Take any described investigation — from a textbook, a news story, anywhere — and ask what would make its conclusion less trustworthy. That is the Paper F skill, and it is almost never practised at school.
When reviewing, the useful question is not "what is the right answer" but "what makes the option my child chose insufficient". At this level the wrong answers are rarely wrong outright.
Common questions
Which year level sits ICAS Paper F?
Year 8. ICAS names its papers by letter rather than by year — Paper A is Year 3 and Paper F is Year 8 — so a Year 8 student sits Paper F.
How long is Science Paper F?
40 questions in 60 minutes.
What is the Paper F skill?
Criticising an investigation: saying what would make its conclusion less trustworthy. It is almost never practised at school, where experiments are usually performed rather than judged.
Year 8 also sits: Maths Paper F · English Paper F
Sample questions
Try each one first, then open the answer and worked solution under it.
Answer and worked solution
Correct answer: C
The drift was not there at the start and reached 0.3 units by midday, growing steadily in between.
So a sample measured early carries almost no drift while one measured near midday carries nearly all of it.
Correcting each reading by the drift that had accumulated when it was taken fits what was actually measured.
Each reading should be corrected by the drift that had built up at the time it was taken.
2. A student records both the number of leaves and the height of ten seedlings. One seedling is recorded as 2 cm tall with 40 leaves, while the rest run from 8 to 20 cm with 4 to 11 leaves. What is the most reasonable reading of that record?
Answer and worked solution
Correct answer: B
Compare the suspect row with the pattern in the other nine: height and leaf count rise together there.
This row breaks that pattern in both columns at once, being the shortest plant and the leafiest by a factor of nearly four.
Two simultaneous extremes in opposite directions point to a slip in recording rather than to a remarkable seedling, so the row needs checking before anything is concluded from it.
Both columns are extreme at once, so the row should be checked as a probable recording error.
3. Treated and untreated seedling trays share one watering tray, so run-off from the treated pots reaches the untreated ones. The measured difference between the groups turns out small. What does this do to the finding, and which way?
Answer and worked solution
Correct answer: B
The strategy is to work out not just that there is a fault but which way it pushes the result.
Run-off carries treatment to the untreated pots, so the control group is partly treated rather than untreated.
Partly treating the control moves it towards the treated group, which narrows the gap, so a small measured difference is consistent with a larger real one and the trial understates rather than overstates.
Contamination partly treats the control, narrowing the gap, so the true effect may be larger than measured.
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Related papers: Science Paper E (Year 7) · Maths Paper F (Year 8)
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