Validity And Soundness - Practice Exercises

5 Questions | Total Attempts: 6147

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Sound Quizzes & Trivia

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 also has true premises.


Questions and Answers
  • 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.
    • A. 

      Check here if the argument is VALID.

    • B. 

      Check here if the argument is SOUND.

    • C. 

      Check here if the argument is NEITHER valid NOR sound.

  • 2. 
    Either Princess Diana was assassinated, or she was killed in an accident. Princess Diana was not killed in an accident. So Princess Diana must have been assassinated.
    • A. 

      Check here if the argument is VALID.

    • B. 

      Check here if the argument is SOUND.

    • C. 

      Check here if the argument is NEITHER valid NOR sound.

  • 3. 
    It is January.January is in the wintertime.So it must be winter.
    • A. 

      Check here if the argument is VALID.

    • B. 

      Check here if the argument is SOUND.

    • C. 

      Check here if the argument is NEITHER valid NOR sound.

  • 4. 
    It is February.February is in the wintertime.So it must be snowing.
    • A. 

      Check here if the argument is VALID.

    • B. 

      Check here if the argument is SOUND.

    • C. 

      Check here if the argument is NEITHER valid NOR sound.

  • 5. 
    February 17th is Ash Wednesday.February 17th is this Wednesday.So this Wednesday must be Ash Wednesday.
    • A. 

      Check here if the argument is VALID.

    • B. 

      Check here if the argument is SOUND.

    • C. 

      Check here if the argument is NEITHER valid NOR sound.