Critical Reasoning Test

Ace Logical Reasoning: Test-Prep Practice Questions

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Logical Reasoning Practice Questions

Welcome to our comprehensive collection of stimulus-style practice questions! These questions are designed to sharpen your critical thinking, logical reasoning, and analytical skills. These abilities are crucial for success in many standardized tests. Our carefully crafted questions mirror the format found in prestigious exams like the LSAT, GMAT, and GRE, as well as in many other exams.

Each question presents a brief “stimulus” – a short paragraph containing an argument, scenario, or set of facts – followed by a question and multiple-choice answers. These exercises will challenge you to analyze complex information, identify logical flaws, draw valid conclusions, and evaluate arguments.

 

1. A study found that people who eat breakfast regularly tend to have lower rates of obesity. The researcher concluded that eating breakfast helps prevent weight gain. Which of the following, if true, would most weaken this conclusion?
People who skip breakfast often overeat later in the day
Many breakfast foods are high in sugar and calories
People who eat breakfast tend to exercise more regularly
Obesity rates have increased despite more people eating breakfast
2. All A are B. All B are C. Which of the following must be true based on these premises?
All C are A
All A are C
Some B are not A
Some C are not B
3. A study found that people who drink coffee live longer on average than those who don't. Therefore, drinking coffee causes increased longevity. Which of the following best describes the flaw in this reasoning?
Correlation does not imply causation
The study may have been too small to be reliable
Coffee drinkers may have other healthy habits
The study didn't specify how much coffee was consumed
4. A health expert argues that reducing salt intake will lower the risk of heart disease in the population. Which of the following, if true, would most strengthen this argument?
Countries with lower average salt consumption have lower rates of heart disease
Reducing salt intake lowers blood pressure in most people
Some people are more sensitive to the effects of salt than others
Salt is a necessary nutrient for the human body
5. All birds have feathers. Some animals that have feathers can fly. Therefore, all birds can fly. Which of the following best describes the logical flaw in this argument?
False dichotomy
Circular reasoning
Hasty generalization
Fallacy of the undistributed middle
6. A study found that people who meditate regularly report lower levels of stress. Therefore, meditation reduces stress. Which of the following, if true, would most weaken this conclusion?
People who meditate tend to have other stress-reducing habits
The study relied on self-reported stress levels
Some participants dropped out of the study before its completion
The study was conducted over a short period of time
7. A technology company claims that its new smartphone app can improve users' sleep quality. In a trial, users reported feeling more rested after using the app for a month. Which of the following is an assumption underlying the company's claim?
The users in the trial were representative of the general population
The improvement in sleep quality was due to the app and not other factors
The effects of the app are long-lasting
The app works equally well on all smartphone models
8. No mammals can fly. All bats are mammals. Therefore:
All bats can fly
No bats can fly
Some bats can fly
Some mammals can fly
9. A politician argues that increasing funding for after-school programs will reduce juvenile crime rates. Which of the following, if true, would most weaken this argument?
Cities with well-funded after-school programs have lower juvenile crime rates
Juvenile crime rates have decreased in recent years without increased funding for after-school programs
After-school programs improve academic performance
Parents support increased funding for after-school programs
10. In a certain species of fish, 10% are born with a rare genetic mutation. Of those with the mutation, 80% survive to adulthood. Of those without the mutation, 60% survive to adulthood. What percentage of adult fish of this species have the mutation?
8%
10%
13%
15%
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These questions assess critical thinking, logical reasoning, and analytical skills. Here’s a list of some exams that typically include such questions:

LSAT (Law School Admission Test)
GMAT (Graduate Management Admission Test)
GRE (Graduate Record Examinations)
MCAT (Medical College Admission Test)
SAT (Scholastic Assessment Test)
ACT (American College Testing)
Critical Thinking Assessment Test (CAT)
Watson-Glaser Critical Thinking Appraisal
California Critical Thinking Skills Test (CCTST)
CLA+ (Collegiate Learning Assessment)
California Bar Exam’s performance test section
Certain civil service exams
Some corporate hiring assessments

These exams use stimulus-based questions to evaluate a candidate’s ability to analyze information, identify logical flaws, draw valid conclusions, and evaluate arguments. The questions present a short paragraph or scenario followed by a question and multiple-choice answers.