LSAT 109 – Section 1 – Question 11

LSAT 109 - Section 1 - Question 11

December 2000

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Target time: 1:44

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT109 S1 Q11
+LR
Must be true +MBT
Quantifier +Quant
A
11%
165
B
11%
163
C
14%
163
D
10%
160
E
54%
169
155
165
175
 +Hardest 148.877 +SubsectionMedium

J.Y.’s explanation

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Researchers have discovered that caffeine can be as physically addictive as other psychoactive substances. Some people find that they become unusually depressed, drowsy, or even irritable if they do not have their customary dose of caffeine. This is significant because as many people consume caffeine as consume any one of the other addictive psychoactive substances.

Summary
Caffeine can be as physically addictive as other psychoactive substances.
Some people become unusually depressed, drowsy, or irritable if they don’t have the level of caffeine they’re used to.
As many people consume caffeine as consume any of the other addictive psychoactive substances. So, for example, if 100 people eat psychoactive substance X, then at least 100 people consume caffeine.

Notable Valid Inferences
There’s no clear inference that I’d have in mind. I’d just use process of elimination for the answer choices.

A
There is no psychoactive substance to which more people are physically addicted than are addicted to caffeine.
Could be false. We know that as many people CONSUME caffeine as consume other psych subs. That doesn’t mean the caffeine-consumers are addicted to it. Also, caffeine CAN BE as physically addictive as psych. substances. That doesn’t tell us how many people actually are addicted.
B
A physical addiction to a particular psychoactive substance will typically give rise to diverse psychological symptoms.
Could be false. We know “some” people have certain symptoms if they don’t have enough caffeine. That doesn’t mean these symptoms are “typical” results of addiction. “Typical” means most of the time.
C
Not all substances to which people can become physically addicted are psychoactive.
Could be false. The stimulus only tells us about psychoactive substances. We have no idea whether there are substances that people can be addicted to that are NOT psychoactive.
D
If one is physically addicted to a psychoactive substance, one will become unusually depressed when one is no longer ingesting that substance.
Could be false. We know “some” people become depressed from not getting enough caffeine. That doesn’t mean if you’re addicted to a substance, you “will” become unusually depressed if you don’t get the substance. We don’t know that result is guaranteed.
E
If alcohol is a physically addictive psychoactive substance, there are not more people who consume alcohol than consume caffeine.
Must be true. Based on the last sentence. As many consume caffeine as consume any other addictive psych subs. So if alchohol is addictive psych subs., as many people consume caffeine as consume alcohol.

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LSAT PrepTest 109 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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