Use this free practice quiz with 20 questions to review 8 Knowledge, Reason, and Science, test your knowledge, and prepare for your next test or exam.
Researchers observe that a medicine helps patients in several carefully controlled trials and conclude that it is likely to help similar patients. This conclusion is inductive and is therefore guaranteed by the observations to be true.
True
False
Because experiments can help identify causes, every scientific field must manipulate its subjects directly to produce scientific knowledge.
True
False
A researcher proposes a theory that rules out a specific possible observation. Which feature of the theory does this illustrate?
It explains every possible observation, so no evidence can challenge it.
It rules out some possible observations, so evidence could count against it.
It has already been proven true by repeated experiments.
It relies only on experiments that directly manipulate the subjects.
Which practices can strengthen a scientific claim? Select all that apply.
The evidence is gathered using reliable methods.
The conclusion is treated as certain and no longer open to correction.
The methods are transparent enough for others to examine.
Independent approaches converge on results that withstand repeated testing.
When the same evidence fits more than one explanation, which responses may help researchers assess the alternatives? Select all that apply.
Gather additional evidence that may distinguish rival accounts.
Assume that only one explanation can fit the evidence.
Use better methods to improve the evidence available.
Compare how well the rival explanations account for the evidence.
What form of inference favors a hypothesis that explains the evidence well while also considering simplicity, coherence, and scope?
In reasoning, the conclusion is intended to follow from the premises.
Inductive reasoning uses or established patterns to support conclusions beyond them, but it does not guarantee logical .
A scientific theory makes a prediction that does not match the observed result. Explain why this mismatch does not automatically prove the theory false, and describe what researchers should examine before drawing a conclusion.
A student learns from a reliable teacher that a triangle has three sides. The student's justification for the claim is based on understanding the concept, not on measuring triangles. How is the claim justified?
It can be a priori because its justification is independent of sensory experience.
It must be a posteriori because the person learned it by hearing someone say it.
It is inductive because it comes from a person's observation.
It cannot count as knowledge because the person did not discover it independently.
According to Hume's problem of induction, an argument that predictions based on past patterns are justified because those predictions have worked in the past avoids relying on induction.
True
False
A researcher asks what knowledge is, how people acquire it, and what justifies their beliefs. What field of philosophy is the researcher investigating?
A person wants to know whether it is raining outside. Which description best explains how this claim can be justified?
It is knowable a priori because the idea of rain can be defined.
It is knowable a posteriori because it depends on observation or reliable testimony.
It is deductive because weather claims follow necessarily from definitions.
It is unknowable because observation can never justify a belief.
An argument has true premises, and its conclusion follows necessarily from them. What does this establish about the argument's conclusion?
The conclusion is probably true because similar cases have been observed.
The conclusion is true because it offers the simplest explanation.
If the premises are true and the reasoning is valid, the conclusion cannot be false.
The conclusion is true only if repeated experiments have confirmed it.
A researcher changes one factor while holding other relevant factors steady, then measures the outcome. What is the main scientific advantage of this design?
It guarantees that the hypothesis is true.
It can help identify causes by controlling relevant variables.
It replaces the need to gather evidence.
It ensures that all scientific fields can manipulate their subjects.
Two hypotheses fit the available observations. A researcher favors the one that explains them well and has greater coherence and scope. Which form of reasoning best describes this choice?
Deduction, because the conclusion must follow from the evidence.
Induction, because the hypothesis is a generalization from repeated cases.
Inference to the best explanation, because the hypothesis is favored for explaining the evidence well.
A priori reasoning, because the hypothesis does not require any evidence.
What philosophical problem asks what justifies using past patterns to predict unobserved cases, given that a consistent past does not logically guarantee a similar future?
Which feature makes a theory falsifiable in Popper's influential account?
It rules out some possible observations, so evidence could count against it.
It has already been proven true by a single successful test.
It explains every possible observation equally well.
It can be tested only by experiments that manipulate the subject.
Which outcome would most reasonably strengthen confidence in a scientific claim without making it infallible?
A result becomes certain once one research team reports it.
Confidence can increase when results withstand repeated testing and independent approaches converge.
Replication guarantees that a theory will never need revision.
Peer criticism makes further evidence unnecessary.
A field team notices that its temperature sensor consistently reads higher than a trusted reference thermometer. What procedure should the team use to check and adjust the sensor before relying on its measurements?