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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 hypothesis for a school science investigation. 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

  1. Press generate for a question.
  2. Turn it into a hypothesis, or generate again for another one.

Common use cases

  • Science-class hypothesis practice
  • Science fair project starters
  • Homework prompts

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.

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, and some draws will not be appropriate for a school laboratory at all.

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