Exploring Fair Tests in Scientific Investigations

What is essential for scientists to support their claims?

• Personal opinions

• Imaginative stories

• Evidence through experiments

• Popular beliefs

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What is the main purpose of scientific experiments?

• To prove personal opinions

• To collect reliable evidence

• To make experiments complex

• To use all available resources

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What role does evidence play in scientific claims?

• It provides a basis for storytelling

• It is not necessary for scientific claims

• It supports claims with verifiable data

• It makes the claims more interesting

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What must remain constant in a fair test except the variable being tested?

• The time of day

• All other conditions

• The washing machine used

• The type of cloth

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What is the significance of keeping variables the same in an experiment?

• To use more resources

• To guarantee the reliability of the results

• To make the experiment more challenging

• To ensure the experiment takes longer

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Why do Karina and Alex include a cloth washed without any liquid in their experiment?

• Because they forgot to add liquid

• To test water's cleaning ability

• As a control experiment

• To save washing liquid

What additional information does a control experiment provide?

• The color of the washing liquid

• The effectiveness of the variable being tested

• The brand popularity of washing liquids

• The price of the washing liquids

What does the placebo effect demonstrate?

• The cost of medicine

• The need for control experiments

• Improvement due to belief in treatment

• The effectiveness of medicine

Why is a control experiment important in testing new medicines?

• To test the medicine's color

• To make the medicine look effective

• To compare with a non-medicinal tablet

• To increase the number of volunteers

Why might some science investigations not require a fair test or control experiment?

• When the investigation is about theoretical concepts

• When the results are already known

• When the experiment is too simple

• When the question involves imaginative scenarios