LSAT 112 – Section 3 – Question 26

LSAT 112 - Section 3 - Question 26

December 2001

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT112 S3 Q26
+LR
Strengthen +Streng
Causal Reasoning +CausR
A
12%
158
B
70%
162
C
7%
153
D
7%
154
E
4%
151
142
152
162
 +Medium 144.548 +SubsectionEasier

Before 1986 physicists believed they could describe the universe in terms of four universal forces. Experiments then suggested, however, a fifth universal force of mutual repulsion between particles of matter. This fifth force would explain the occurrence in the experiments of a smaller measurement of the gravitational attraction between bodies than the established theory predicted.

Summarize Argument: Phenomenon-Hypothesis
The author argues there’s a fifth universal force: mutual repulsion between particles of matter. This force would explain a phenomenon that the other four forces can’t explain on their own.

Notable Assumptions
While the fifth force would resolve one phenomenon, the scientist never tells us that the fifth force is consistent with other phenomena that the four forces already account for. The scientist therefore assumes that the fifth force is indeed compatible with other phenomena.

A
The extremely sophisticated equipment used for the experiments was not available to physicists before the 1970s.
This explains why scientists hadn’t considered the fifth force. We’re trying to strengthen the hypothesis that such a force exists.
B
No previously established scientific results are incompatible with the notion of a fifth universal force.
The fifth force doesn’t contradict settled science. If it did, the scientist couldn’t hypothesize that such a force exists.
C
Some scientists have suggested that the alleged fifth universal force is an aspect of gravity rather than being fundamental in itself.
This weakens the scientist’s hypothesis. The fifth force isn’t really a force at all—it’s an aspect of gravity.
D
The experiments were conducted by physicists in remote geological settings in which factors affecting the force of gravity could not be measured with any degree of precision.
This weakens the scientist’s hypothesis. The experiments, which the scientist uses as evidence, were undertaken in highly suboptimal circumstances
E
The fifth universal force was postulated at a time in which many other exciting and productive ideas in theoretical physics were developed.
We don’t care what else was happening in physics.

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LSAT PrepTest 112 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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