PT138.S4.Q1 > Question

SECTION 1 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14

PASSAGE 3

Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22

PASSAGE 4

Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 2 · lr

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22 Question 23 Question 24 Question 25 Question 26

SECTION 3 · lr

SECTION 4 · lr

Jim concludes that a substance contains iron because it’s attracted to a magnet, and iron is a material that’s attracted to magnets.

This is a cookie-cutter example of an argument mistaking a sufficient condition for a necessary condition. Jim treats “containing iron” as though it were a necessary condition for being magnetic, even though it’s only sufficient. In other words, he ignores the possibility that the substance contains a magnetic material other than iron.

This possibility is irrelevant because the iron was attracted to the magnet in this case.

The argument is only concerned with whether being attracted to a magnet is enough to prove that a substance contains iron. Whether iron is also attracted to other objects has no bearing on that issue.

Even if this were a requirement, the magnet would have had to have been oriented correctly since it attracted the substance in this case.

This possibility undermines the conclusion because it means that the substance could be attracted to the magnet even if it contains some magnetic material other than iron.

The argument is only concerned with whether the magnet attracts the substance or not; the degree to which it attracts the substance is irrelevant.

PrepTest 138 - Section 4 - Question 1

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