Phil. 103: Introduction to Logic
Quiz 3: Truth, Validity, and Soundness
Fall 2002 c
2002 OPL
Directions:
Carefully study statements 1-10 Decide whether each statement is
true or false and write in the spaces provided the word “true” or the
work “false” in accordance with your decision.
1. A sound argument is a valid deductive argument
with true premisses.
2. All valid deductive arguments are sound arguments.
3. A deductive argument cannot be both valid and un-
sound.
4. An invalid deductive argument could have all true
statements in it.
5. In a valid deductive argument the conclusion could
be true or false.
6. A deductive argument could have a false premiss and
still be sound.
7. If a deductive argument is sound, then the conclusion
must be true.
8. When the premisses of a deductive argument are
true, the conclusion is always true as well.
9. When the conclusion of a deductive argument is true,
the argument must be sound.
10. A deductive argument can be either valid or invalid
and still have true premisses.
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