9th Grade Logic Quizzes, Questions & Answers

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Validity And Soundness - Practice Exercises

Determine whether each of the following arguments are VALID and/or SOUND. Remember: A valid argument is one whose conclusion is guaranteed if we assume that its premises are true, and a sound argument is one that is valid and...

Questions: 5 | Attempts: 11309 | Last updated: Jul 5, 2025

Sample Question 1
Either President Lincoln was assassinated, or he was killed in an accident. President Lincoln was not killed in an accident. Therefore, President Lincoln must have been assassinated.

Check here if the argument is VALID.

Check here if the argument is SOUND.

Check here if the argument is NEITHER valid NOR sound.

Sample Question 2
Which of the following statements correctly describes the concepts of validity and soundness in logical arguments?

Validity refers to whether the conclusion logically follows from the premises, while soundness additionally requires that all premises are true.

Soundness refers to whether the conclusion logically follows from the premises, while validity additionally requires that all premises are true.

Validity and soundness are interchangeable terms that both describe whether an argument is logically consistent.

Validity refers to whether the premises are true, while soundness refers to whether the conclusion is logically consistent.

Identifying Premises And Conclusions

Quiz yourself on the terms and concepts you've learned in this section!

Questions: 5 | Attempts: 6541 | Last updated: Jun 10, 2025

Sample Question 1
Arguments in ordinary language usually aren’t presented in standard form.

True

False

Sample Question 2
“There’s no way you’ll get the job. The job ad says you need a high school diploma to apply.” What premise is assumed, but not explicitly stated, in this argument?

The job requires a high school diploma.

You shouldn’t bother applying for the job.

You don’t have a high school diploma.

9th Grade Logic Quizzes, Questions & Answers

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