Logical ReasoningDifficulty: Easy

PT6 S2 Q15 Explanation

J. J. Thomson, the discoverer of the

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsNecessary Assumption

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Stimulus

J. J. Thomson, the discoverer of the electron and a recipient of the Nobel Prize in physics, trained many physicists, among them seven Nobel Prize winners, 32 fellows of the Royal Society of London, and 83 professors of physics. creative research can be taught and learned.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
15.

Which one of the following is an assumption on which the

Answer choices

  1. Out of Scope: International Reputation1% picked this

    J. J. Thomson was an internationally known physicist, and scientists came from all over the world

    This is irrelevant to the argument about teaching creative research skills. The argument isn't concerned with Thomson's reputation or where his students came from, rather how his teachings instilled skills.

  2. Too Strong: All Scientists12% picked this

    All the scientists trained by J. J. Thomson were renowned for their

    The argument doesn't have to assume that all of Thomson's students were renowned for their creative research; it needs to show that at least some gained creative skills. This choice is unnecessarily strong; recognizing the significance of even a subset of his students is enough to support the conclusion.

  3. Correct75% picked this

    At least one of the eminent scientists trained by J. J. Thomson was not a creative researcher before

    Why this is right

    This choice directly supports the idea that the skills for creative research can be taught and learned in the time under Thomson, rather than his students already having those skills before they met him. If we negate this and "all of the eminent scientists trained by JJ were already creative researchers before coming to study with him", then we wouldn't be giving him any credit for teaching them the skills to be a creative researcher. They clearly didn't learn it from JJ, if they already possessed the skills before being trained by him.

    Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.

  4. Out of Scope2% picked this

    Creative research in physics requires research habits not necessary for creative research

    Out of Scope: other fields Too Strong: requires This argument has nothing to do with comparing physics to other fields. It's just about trying to show examples where the skills needed for creative research were taught/learned, and physics happens to be the type of example used.

  5. Too Strong: often10% picked this

    Scientists who go on to be the most successful researchers often receive their scientific education in classes taught

    This answer is basically saying "this kind of things we just described with JJ and his eventually-famous students happens often". It doesn't matter whether it happens often or if JJ's experience was the only instance like it. As long as that experience is a valid example of creative research skills being taught / learned, then the author could prove her conclusion true.

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