These free LSAT Logical Reasoning questions give you original LSAT-style drills, answer choices, and full explanations. Practice the argument first, then use the wrong answers to spot the trap that pulled you off course. These are not official LSAT questions, but they target recurring Logical Reasoning tasks.
How to Approach LSAT Logical Reasoning Questions
Before reading the answers, identify the conclusion and the evidence supporting it. Then read the question stem closely: a flaw question asks what went wrong, while a necessary assumption question asks what must be true for the argument to work.
Use this quick routine:
- State the conclusion in your own words.
- Mark the evidence offered for it.
- Name the gap between evidence and conclusion.
- Predict the correct answer's job before looking at the choices.
For strengthen and weaken questions, the right answer changes how likely the conclusion is. For sufficient assumption questions, it must make the conclusion follow with certainty. For inference and parallel reasoning, track the exact logical form and do not reverse conditional statements.
Free LSAT Logical Reasoning Practice Questions
1. Flaw Question
A city council member argues: “Since a protected bike lane was installed on Maple Street, more cyclists use Maple Street. Therefore, installing the bike lane caused more people to use Maple Street.”
The argument is most vulnerable to criticism because it:
A. assumes the increase will continue indefinitely. B. treats an event that followed another as caused by it. C. assumes all cyclists prefer protected lanes. D. assumes the increase was large enough to matter. E. ignores whether cyclists also use other streets.
Answer: B
The evidence establishes sequence: the bike lane came first, and bike use increased later. It does not prove that the lane caused the increase. Better weather, a nearby event, or a change in commuting patterns could explain it.
A is about a prediction the argument never makes. C is stronger than necessary; the argument does not require every cyclist to prefer protected lanes. D and E may matter to a policy discussion, but neither identifies the reasoning error.
2. Necessary Assumption Question
A museum director says, “Every evening tour sold out last month. If we add more evening tours, the museum will serve more evening-tour visitors.”
The director’s argument requires assuming that:
A. the added evening tours will be led by the same guides. B. at least some potential visitors would attend an added evening tour if one were offered. C. evening tours are more enjoyable than daytime tours. D. all visitors who attend evening tours live nearby. E. the museum will advertise the added tours.
Answer: B
The conclusion depends on demand beyond the museum's current capacity. Existing tours selling out does not guarantee that additional tours would attract anyone.
Use the negation test: negate B and assume no additional potential visitor would attend an added tour. The conclusion that the museum would serve more evening-tour visitors falls apart. That makes B necessary.
3. Sufficient Assumption Question
At a debate club, anyone who attends four workshops and completes two practice debates may enter the qualifying round. Lena has attended four workshops. The organizer concludes that Lena may enter the qualifying round.
Which assumption makes the conclusion logically valid?
A. Lena attended more workshops than any other club member. B. Some club members enter the qualifying round without enjoying the workshops. C. Lena plans to attend another workshop next month. D. Lena has already completed two practice debates. E. The qualifying round occurs before the club’s final tournament.
Answer: D
The rule requires two conditions: four workshops and two completed practice debates. Lena already has the first. D adds the missing condition, so the conclusion follows.
A comparison with other students, a future plan, and scheduling details do not establish eligibility.
4. Strengthen Question
A librarian says, “Students often check out print historical newspapers. The library should buy a searchable digital newspaper archive because students will use it frequently.”
Which statement most strengthens the argument?
A. The archive includes some newspapers unavailable in print. B. Some students prefer printed materials. C. The print collection covers many decades. D. Other digital archives cost more. E. Students who use print newspapers say they would use a searchable digital version.
Answer: E
The argument moves from current print-newspaper use to predicted digital-archive use. E directly supports that move by showing that the relevant users expect to use the proposed resource.
A supplies a possible benefit but does not strongly establish frequent use. B points in the other direction. C and D do not address the prediction.
5. Weaken Question
A restaurant owner argues, “After the restaurant introduced online reservations, fewer customers left without being seated. Therefore, online reservations caused the reduction in customers leaving.”
Which statement most weakens the argument?
A. The restaurant changed its menu shortly before introducing online reservations. B. Many customers prefer calling the restaurant to make reservations. C. The restaurant added several tables during the same week it introduced online reservations. D. Some customers who make reservations arrive late. E. The reservation system lets customers cancel online.
Answer: C
The conclusion treats online reservations as the cause. C gives a clear alternative explanation: more tables could have allowed more customers to be seated, reducing the number who left.
A is nearby in time but does not clearly explain the change in seating. B, D, and E may be relevant to reservations generally, but they do not offer a competing cause for the reported result.
6. Inference Question
No manuscript that lacks citations is accepted by the journal. All manuscripts accepted by the journal are peer-reviewed.
If the statements above are true, which conclusion must be true?
A. Every peer-reviewed manuscript is accepted by the journal. B. Every accepted manuscript includes citations. C. Some peer-reviewed manuscripts lack citations. D. A manuscript is accepted only if it has been peer-reviewed twice. E. Every manuscript with citations is peer-reviewed.
Answer: B
The first statement tells you that an accepted manuscript cannot lack citations. Therefore, every accepted manuscript includes citations.
A and E reverse a relationship. C could be true, but nothing requires it. D adds a detail never provided.
7. Resolve the Discrepancy Question
A tutoring center added more appointment slots, yet the number of students served each week did not increase.
Which statement most helps explain the result?
A. The center advertised the new slots to teachers. B. Many new slots were scheduled at times when students could not attend. C. The center’s previous slots were often fully booked. D. Tutors received additional training. E. Students rated tutoring highly.
Answer: B
Put the two facts together: the center had more capacity, but it served no more students. B makes both facts possible because the new capacity existed at unusable times.
A, C, and E suggest demand and make the result more surprising. D concerns service quality rather than appointment attendance.
8. Parallel Reasoning Question
“Every applicant who submits all required documents receives a complete application review. Lina is an applicant who submitted all required documents. Therefore, Lina will receive a complete application review.”
Which argument has the most similar logical form?
A. Every violinist practices. Omar practices, so Omar is a violinist. B. If a device is charged, it can turn on. This device is charged, so it can turn on. C. Some runners wear watches. Priya wears a watch, so Priya is a runner. D. If a film is popular, it is good. This film is good, so it is popular. E. No reptiles have fur. Turtles are reptiles, so all furless animals are turtles.
Answer: B
The complete antecedent in the original argument is: a person is an applicant who submits all required documents. Lina satisfies that complete condition. The conclusion then applies the stated rule: she receives a complete application review.
B has the same valid structure: if A, then B; A; therefore B. A and D reverse a conditional. C treats a shared trait as proof of membership. E reaches a conclusion far broader than its evidence.
Review Wrong Answers by Error Type
After each missed question, assign one label. This keeps review focused and makes repeat patterns easier to see.
- Task mismatch: Your answer was relevant but did not do what the stem required.
- Causal leap: You treated timing, correlation, or comparison as proof of causation.
- Missing link: You missed the unsupported assumption connecting evidence to conclusion.
- Conditional reversal: You confused “if A, then B” with “if B, then A.”
- Scope shift: The choice changed the group, time period, or strength of the claim.
- Partial support: The choice helped somewhat but was not strong enough to prove, weaken, or explain the argument.
For each miss, write a short review note: “I chose ___ because ___. It fails because ___.” Then redo the question without looking at the choices and predict the answer before checking it.
For extra practice with argument structure, try PurrLearn’s deductive versus inductive reasoning quiz. Interactive questions are useful when you want to isolate one reasoning pattern before returning to mixed LSAT practice.
FAQ
Are these official LSAT Logical Reasoning questions?
No. These are original LSAT-style practice questions. Official LSAT materials remain the best source for practicing the exact wording and difficulty of the exam.
How should I review an LSAT Logical Reasoning question I got wrong?
Identify the question type, conclusion, and evidence. For argument questions, name the missing link; for conditional questions, write the rule as “if A, then B” and check whether you reversed it.
Which Logical Reasoning question types should I practice first?
Start with flaw, necessary assumption, strengthen, and weaken questions. They build the core habit behind much of Logical Reasoning: noticing what the evidence does not establish.
Should I read every answer choice during review?
Yes. Each wrong answer usually represents a recognizable trap: a scope shift, a reversal, an irrelevant fact, or an answer that is too weak. Under timed conditions, eliminate efficiently; during review, study every choice.
Conclusion
Free LSAT Logical Reasoning questions help most when you review the reasoning behind every answer choice, not only the credited letter. Keep a brief error log, revisit repeated mistakes, and practice recognizing causal leaps and missing assumptions. PurrLearn’s cognitive bias quiz can help reinforce those same argument-evaluation skills in an interactive format.