LSATHacks
  • Explanations
  • Tutoring
  • Courses
  • Login
  • Cart
  • Explanations
  • Tutoring
  • Courses
  • Login
  • Cart
LSAT Explanations › PrepTest 105 › Section 2

Logical Reasoning

PrepTest 105 Section 2

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

25 question explanationsUnscored section

Choose a question

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

  1. Q1:
    French divers recently found a large cave along the…Most Strongly Supported

    You can only get into the cave through an underwater tunnel.

  2. Q2:
    A director of the Rexx Pharmaceutical Company argued…Weaken

    The director claims vaccines are less profitable to market.

  3. Q3:
    Manager: Our new computer network, the purpose of which…Necessary Assumption

    The network should be installed during the day.

  4. Q4:
    An ingredient in marijuana known as THC has been found…Weaken

    Marijuana can cause cancer.

  5. Q5:
    Archaeologist: A large corporation has recently offered…Principle – Strengthen

    We should reject the corporation's offer to restore the site and let the general public visit it.

  6. Q6:
    Besides laying eggs in her own nest, any female wood…Most Strongly Supported

    Female wood ducks will lay eggs in other ducks' nests if they see them leave.

  7. Q7:
    The crux of creativity resides in the ability to…Must be True – Exception

    Creativity is making variations to a theme.

  8. Q8:
    Millions of female bats rear their pups in Bracken Cave…Main Point

    Mother bats can recognize the cry of their pups.

  9. Q9:
    Someone who gets sick from eating a meal will often…Strengthen

    Children are particularly likely to hate certain foods because of the fact that if a meal makes someone sick, they will dislike the ingredient that gave it its strongest taste.

  10. Q10:
    Premiums for automobile accident insurance are often…Flawed Reasoning

    We could save lives if we got rid of all red cars.

  11. Q11:
    A certain credit-card company awards its customers…Necessary Assumption

    You can always get stuff cheaper with rewards points than in store.

  12. Q12:
    It is probably not true that colic in infants is cause…Weaken

    It's not likely that colic happens because babies are vulnerable to some antibodies in cow's milk.

  13. Q13:
    Gaining access to computers without…Point at Issue
  14. Q14:
    Yolanda: Gaining access to computers without…Flawed Reasoning
  15. Q15:
    A report of a government survey concluded that Center City was…Flawed Reasoning

    The survey found that Center City had the highest dropout rate *from its schools*.

  16. Q16:
    Brown dwarfs–dim red stars that are too cool to burn…Necessary Assumption

    Any star without lithium isn't a cool brown dwarf. [or: cool brown dwarfs have lithium.]

  17. Q17:
    Whenever a company loses a major product…Flawed Parallel Reasoning

    Cotoy lost the lawsuit.

  18. Q18:
    In recent years the climate has been generally cool in…Paradox

    Currently, northern Asian crops grow better when heat and humidity are slightly higher.

  19. Q19:
    No one in the French department to which Professor…Parallel Reasoning

    Professor Alban won't be teaching two introductory classes.

  20. Q20:
    Some people have been promoting a new herbal mixture as…Necessary Assumption – Exception

    The cold sufferer thinks the remedy won't work.

  21. Q21:
    Some people have been promoting a new herbal mixture as…Method of Reasoning

    The cold sufferer thinks the remedy won't work.

  22. Q22:
    To hold criminals responsible for their crimes…Flawed Reasoning

    People who obey the law are *entirely* responsible for criminal behavior.

  23. Q23:
    Chronic back pain is usually caused by a herniated or…Most Strongly Supported

    Most back pain comes from degenerated disks.

  24. Q24:
    Each December 31 in Country Q, a tally is made of the…Must be True

    No coal has gone in or out of the country since 1970.

  25. Q25:
    Tom: Employers complain that people graduating from…Relationship Between Arguments

About this section

Originally Section 1 of PrepTest 20, administered in October 1996.

Question types

Flawed Reasoning4 · 16%
Most Strongly Supported3 · 12%
Necessary Assumption3 · 12%
Weaken3 · 12%
Flawed Parallel Reasoning1 · 4%
Main Point1 · 4%
Method of Reasoning1 · 4%
Must be True1 · 4%
Must be True – Exception1 · 4%
Necessary Assumption – Exception1 · 4%
Paradox1 · 4%
Parallel Reasoning1 · 4%
Point at Issue1 · 4%
Principle – Strengthen1 · 4%
Relationship Between Arguments1 · 4%
Strengthen1 · 4%

Based on our explanation classifications. Each of the 25 questions is counted once.

Section 1: Logical Reasoning
Section 3: Reading Comprehension
All PrepTest 105 explanations

Hi, I'm Graeme Blake

I scored a 177 on the LSAT. I founded LSATHacks and created the LSAT Mastery Seminars to help students succeed.

I’ve personally written explanations for 5,000+ LSAT questions. If you find these explanations helpful, you'll definitely like our courses.

Join my email list for LSAT study tips and resources.

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Resources

  • Articles
  • Blog
  • Free Email Course
  • LSAT Preptest Converter
  • Experimental Section Checker
  • LSAT Prep Books

About LSATHacks

  • About/Contact
  • Courses
  • Free Trial

Community

  • Discord
  • Social Media
  • Webinars
Disclaimer: Use of these explanations requires official LSAT preptests. LSAT is a registered trademark of LSAC.
LSAC does not review or endorse specific test preparation materials or services and has not reviewed this site.

© Copyright 2026 LSATHacks. All Rights Reserved. | Privacy | Terms