LSAT Logical Reasoning: Free Practice Questions & Explanations

1. A town installed brighter streetlights, and reported nighttime accidents fell. The mayor concludes that the new lights caused the decline. Which fact most weakens the conclusion?

2. A museum director says the museum should extend its hours because attendance has increased every summer. Which assumption is required?

3. A researcher argues that a new tutoring program improves algebra scores because students in the program scored higher than students who did not join. Which fact most strengthens the argument?

4. A company lowered prices and sold more units. The manager concludes that customers are now more satisfied. The argument is most vulnerable because it:

5. A policy is effective only if it reduces both delays and errors. A new policy reduced delays but had no measured effect on errors. What follows?

6. A critic says a proposed park will fail because one nearby park is rarely used. Which flaw best describes the reasoning?

7. A speaker says, “The plan is affordable, but it will not solve the problem.” The speaker and a supporter of the plan disagree about whether the plan:

8. A city claims that a recycling campaign increased recycling because the amount collected rose after the campaign. Which fact is necessary for that reasoning?

1. A report finds that employees who take walking breaks report greater concentration. Which fact most weakens the report’s conclusion that walking breaks cause concentration?

2. Every successful grant proposal in a sample included a detailed budget. The director concludes that detailed budgets guarantee success. The conclusion is not supported because the proposals may also:

3. A scientist says a chemical is safe because no test has yet found a harmful effect. Which assumption is required?

4. A school adds a review session, and exam scores rise. Which fact best supports the claim that the session caused the rise?

5. A rule says any project receiving public funds must publish its costs. A city project receives public funds. What must be true?

6. A survey asks only members of a hiking club whether residents support a new trail. The survey is most vulnerable to:

7. A company says its new training is successful because participants rated it highly. Which additional information would be most useful?

8. An argument concludes that a species decline was caused by pollution after observing both pollution and decline. Which question most directly tests the causal claim?