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LSAT Explanations › PrepTest 105 › Section 1

Logical Reasoning

PrepTest 105 Section 1

Find the question you’re working on. Explore the reasoning, understand each answer, and learn from your mistakes.

26 question explanationsScored section

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Explanations for every question, find them by number or text.

  1. Q1:
    Tennyson’s line of poetry "nature, red in tooth and …Identify the Conclusion

    Tennyson’s line was not meant to reference Darwin’s theory of evolution.

  2. Q2:
    Tennyson’s line of poetry "nature, red in tooth and …Role in Argument

    Tennyson’s line was not meant to reference Darwin’s theory of evolution.

  3. Q3:
    Space programs have recently suffered several setbacks …Strengthen

    Large space projects should be abandoned in favor of several small projects.

  4. Q4:
    In an experiment testing whether hyperactivity …Weaken

    Diminished activity in the premotor cortex is one cause of hyperactivity.

  5. Q5:
    Large discount chains can make a profit even while …Flawed Reasoning

    Small retailers that compete with big discount chains must offer exceptional service to retain profitability.

  6. Q6:
    We should do what will make others more virtuous …Flawed Reasoning

    We should do what makes others more virtuous and avoid what makes them less virtuous.

  7. Q7:
    Generic drugs contain exactly the same active ingredients …Strengthen

    Generic drugs are just as effective as brand-name counterparts but cost less.

  8. Q8:
    Economist: In the interaction between producers and consumers …Necessary Assumption

    Consumers are always obligated to report product defects but producers are never obligated to reveal them.

  9. Q9:
    All potatoes naturally contain solanine …Sufficient Assumption

    Peeling wild potatoes makes them at least as safe to eat as unpeeled domesticated potatoes of the same size.

  10. Q10:
    The consequences of surgical errors can be devastating …Flawed Reasoning

    Surgery performed by anyone but a general surgeon involves highly undesirable risks.

  11. Q11:
    Although the concept of free will is essential to …Role in Argument

    The role of free will isn’t applied the same in determining moral responsibility across different situations.

  12. Q12:
    Alice will volunteer to work on the hospital fund-raising …Parallel Reasoning
  13. Q13:
    If an artist receives a public subsidy to support …Method of Reasoning

    An artist who receives a public subsidy and later becomes financially successful is morally obligated to repay it.

  14. Q14:
    If an artist receives a public subsidy to support …Principle – Justify

    An artist who receives a public subsidy and later becomes financially successful is morally obligated to repay it.

  15. Q15:
    The budget surplus should be used only to increase …Point At Issue
  16. Q16:
    In a town containing a tourist attraction …Weaken (Exception)

    Visitors are selling or sharing passes to the tourist attraction.

  17. Q17:
    The difference between manners and morals …Most Strongly Supported

    Etiquette rules don’t apply when you’re alone.

  18. Q18:
    Sociologist: The intended function of news …Necessary Assumption

    News cannot serve its intended function when it’s primarily entertainment.

  19. Q19:
    Paleontologist: It is widely, but falsely, held that …Strengthen (Exception)

    The belief that life began in the ocean and didn’t exist on land until half a billion years ago is false.

  20. Q20:
    The nature of English literature reflects the …Most Strongly Supported

    English literature reflects the rich and diverse vocabulary of the language.

  21. Q21:
    Two doctrines have been greatly influential …Necessary Assumption

    Both doctrines are mistaken.

  22. Q22:
    Editorial: Supporters of the proposed law that would …Flawed Parallel Reasoning

    Supporters of a bicycle helmet law are misguided.

  23. Q23:
    Deep tillage is even more deleterious to the world’s …Necessary Assumption

    Farmers who till deeply should incorporate no-till methods instead.

  24. Q24:
    Editorial: Our society has a vested interest in maintaining …Principle – Justify

    Governments should assume the cost of candidates’ campaigns.

  25. Q25:
    A clothing manufacturer reports that …Paradox

    All unsalable garments are recycled.

  26. Q26:
    Marion knows that the bridge on her usual route is closed ….Flawed Reasoning

    Marion cannot avoid being late for work.

About this section

Originally Section 1 of PrepTest B, administered in February 1999.

Question types

Flawed Reasoning4 · 15%
Necessary Assumption4 · 15%
Most Strongly Supported2 · 8%
Principle – Justify2 · 8%
Role in Argument2 · 8%
Strengthen2 · 8%
Flawed Parallel Reasoning1 · 4%
Identify the Conclusion1 · 4%
Method of Reasoning1 · 4%
Paradox1 · 4%
Parallel Reasoning1 · 4%
Point At Issue1 · 4%
Strengthen (Exception)1 · 4%
Sufficient Assumption1 · 4%
Weaken1 · 4%
Weaken (Exception)1 · 4%

Based on our explanation classifications. Each of the 26 questions is counted once.

Section 2: Logical Reasoning
All PrepTest 105 explanations

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