Section 1.5 Self Quiz

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. Some rectangles are squares. All squares are parallelograms. So, some rectangles are parallelograms.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. Either all cats are black or all cats are fluffy, but no cat is both. My cat is fluffy. So, my cat is not black.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. If whales are mammals, then so are sharks. Whales aren't not mammals. So, sharks are mammals.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. All humans breathe. Bob breathes. Hence, Bob is human.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. Any paper that receives an A has a thesis. Wanda's paper receives an A. Hence, her paper has a thesis.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. Either Hume or Berkeley wrote a Treatise of Human Nature. Berkeley wrote A Treatise Concerning the Principles of Human Knowledge. So, Hume wrote A Treatise of Human Nature.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. De Beauvoir and Sartre were lovers. Therefore, de Beauvoir had a lover.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. All journalists are writers. All published writing is of high quality. So, some journalists produce high-quality writing.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. All amphibians are either frogs or toads, but not both. No toads live near the water. Leonard is an amphibian and lives near the water. Therefore, Leonard is a frog.

. Determine whether the following arguments is invalid and sound, valid and unsound, or invalid. All flutes are woodwind instruments. Some band members play both the flute and the saxophone. It follows that some band member plays a woodwind instrument.

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