Science in Action: 8 Medium Questions
Explore how scientific ideas explain the natural world, from experimental design to atoms, energy, and evolution.
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Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: Why do controlled experiments change just one variable at a time?
To guarantee the hypothesis is correct
To link an outcome to a specific cause
To eliminate the need for repeated trials
To ensure every result is identical
Question 2: A graph shows a steady rise in temperature as a gas is heated. What does this establish?
The variables are associated in these conditions
The same pattern must occur in every gas
The measurements contain no uncertainty
The temperature rise caused the heating
Question 3: What happens to an atom when it becomes a positively charged ion?
It has gained one or more electrons
It has lost one or more protons
It has gained one or more neutrons
It has lost one or more electrons
Question 4: Why does increasing a wave's frequency increase its energy?
Frequency determines how many photons exist
Higher frequency makes photons larger
Photon energy is proportional to frequency
Higher frequency gives photons more mass
Question 5: Which observation best supports the theory of evolution by natural selection?
A useful trait appears because it is needed
A heritable trait becomes more common over generations
A population's members remain genetically identical
Every individual changes the same trait during its life
Question 6: A medicine works in a small early study. What is the strongest reason to test it in a larger trial?
To ensure every participant responds alike
To replace comparison groups with opinions
To estimate effects more reliably across participants
To make the early result impossible to question
Question 7: Why can a scientific theory be considered well-supported without being called a fact?
A theory is only an untested personal opinion
A fact is a theory that cannot be tested
Theories apply only when evidence is missing
A theory explains evidence, while facts are observations
Question 8: How do greenhouse gases warm Earth's lower atmosphere?
They create heat by stopping Earth's rotation
They block all sunlight from reaching the surface
They reflect every form of radiation back to Earth
They absorb and re-emit some outgoing infrared radiation