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practice+exam+with+answers - Introduction to Logic...

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Introduction to Logic: 730:201:01 Instructor: Jon Winterbottom Practice Exam 1 This exam is divided into three sections. The exam is out of 100 points. The first section covers material from chapter 1 and chapter 2 (exercise sets 1 and 2) of the textbook and is worthy 30 points. The second section covers material from chapter 2 (exercise set C) and chapter 3 of the textbook and is worth 35 points. The third section covers material in chapter 4 and is worth 35 points. Section 1: Are the following statements true or false? Write your answers in the space provided (you may write T for true and F for false). 1. In any valid argument, all the premises are true ____F__ [1] 2. Every sound argument contains factually correct premises ___T_____ [1] 3. Every sound argument has a true conclusion ____T_____ [1] 4. Every valid argument that has true premises also has a true conclusion _____T___ [2] 5. If an argument is factually correct and its conclusion is false, then it must be invalid ____T___ [2] Consider the following syllogisms and answer the questions related to them: All men are mortal Some mortals are over 6 feet tall /Some men are over 6 feet tall 1. Is this argument factually correct? ___YES___ [1] 2. Is this argument valid? ___NO____ [3] [Invalid, since it is consistent with the premises that no men are over 6 foot tall e.g. the second premise only tells us that some mortals are over 6 foot tall, but it could be that there mortals are not men, but some other type of mortal] 3. Is this argument sound? ___NO____ [1] All dogs are fish No fish are air-breathing animals /Some dogs are not air-breathing animals 1. Is this argument factually correct? ___NO___ [1] 2. Is this argument valid? ___YES____ [3] [Valid, since if all dogs are fish and no fish are air-breathing animals, then no dog is an air breathing animal; given that no dog is

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an air-breathing animals, it logically follows that some dogs are not air-breathing animals]. 3.
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practice+exam+with+answers - Introduction to Logic...

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