Science Hypothesis Generator
Generates a random testable science question — the kind of thing you could design a simple experiment around — as practice for writing a hypothesis.
What this generator does
Draws a testable question for a school science investigation, ready to be turned into a hypothesis. The important word is testable: the failure mode of student investigations is a question that cannot be answered with the equipment in the room, and a hypothesis that names a variable is much harder to get wrong.
What you'll get
This generator draws from a hand-checked list of 8 entries. Here is a spread of 6 of them, so you can see the style before you generate:
- Does the amount of sunlight affect how fast a plant grows?
- Does water temperature affect how quickly sugar dissolves?
- Does the colour of an object affect how much heat it absorbs?
- Does the amount of salt in water affect how easily an egg floats?
- Does music affect how quickly someone can concentrate?
- Does the height a ball is dropped from affect how high it bounces?
A fixed sample of the list, not a live draw — your own results are picked at random from all 8, without repeating until the list runs out. Original HEKNO-curated hypothesis-writing practice prompts. Last reviewed 2026-08-17.
How to use this tool
- Press generate for a question.
- Turn it into a hypothesis, or generate again for another one.
Common use cases
- Science-class hypothesis practice
- Science fair project starters
- Homework prompts
How this generator works
Draws one of eight fixed questions — does water temperature affect how quickly sugar dissolves, does the shape of a paper aeroplane affect how far it flies — with a seed word available to set the same question for a whole class investigation. A seed word makes that draw repeatable rather than secret — it is deterministic, not cryptographic.
Randomness and fairness
Drawn uniformly with the browser's cryptographic random number generator, with no filtering by age, equipment or key stage.
For how randomness is produced across the whole site, see how Generate Random works.
Limitations and good to know
- Eight questions is a small, general-science pool; there is nothing here specific to chemistry, biology or physics separately.
- Every question is written as a question, not yet a hypothesis — turning 'does X affect Y' into a proper hypothesis statement is the task the page names, not something it does for you.
Nothing here has been risk-assessed. Any practical work must be assessed against your school's procedures and CLEAPSS guidance before it goes near a student.
Related generators
- Science Experiment Idea GeneratorA simple, low-cost science experiment idea, suited to the classroom or the kitchen table at home.
- Punnett Square GeneratorCrosses two parents and counts the offspring ratios straight from the finished grid, so the three-to-one comes out rather than being quoted.
- Science Fact GeneratorAn interesting science fact, cross-checked against standard reference sources.
- Science Observation Prompt GeneratorWhat to observe before drawing conclusions, distinct from a stated science fact or hypothesis.
- Dihybrid Cross GeneratorDraws a two-gene cross, fills its sixteen-cell square and asks one question about the offspring — with the answer counted from the cells and checked a second way.