LSAT Logical Reasoning Practice Test

Which one of the following, if true, most seriously weakens the environmental planner's argument?

The city has already begun implementing policies to reduce private vehicle usage, which will decrease overall traffic pollution.

A large percentage of the electricity used by the city's power grid is generated using coal, a high-emission fuel source.

The manufacture and disposal of the new electric buses and their batteries will introduce new environmental hazards that were not present with the old fleet.

The new electric buses have a much higher purchase cost than their gas-powered predecessors, straining the city budget.

Studies show that electric buses require more frequent and more extensive maintenance than gas-powered buses do.

Correct! Wrong!

Which one of the following, if true, most strengthens the analyst's argument?

Many employees at Company X found the new productivity software confusing and rarely used its advanced features.

Competitor companies that use similar employee productivity software did not experience a rise in profits last quarter.

The record profits achieved by Company X were actually far higher than the company had projected.

Surveys conducted before the policy change showed that employees were highly dissatisfied with the existing company culture.

The initial cost of the productivity software was significantly higher than the cost of implementing the work-from-home policy.

Correct! Wrong!

Which one of the following is an assumption that the argument requires?

Mandatory vaccination programs are the only way to prevent preventable outbreaks of communicable diseases.

All citizens would comply with a mandatory vaccination program if one were implemented.

The health of the public is the most important factor for the government to consider when setting policy.

A public health threat caused by preventable outbreaks justifies the use of mandatory government programs.

Every individual is capable of being vaccinated against every communicable disease.

Correct! Wrong!

The reasoning in the professor's argument is flawed because it:

fails to define precisely what is meant by 'academic reputation' within the context of university goals.

confuses a cause of the university’s reputation improvement with an effect of the faculty's teaching.

mistakenly assumes that a correlation between two trends demonstrates that one trend must be the cause of the other.

relies on a single, potentially biased source of evidence—the SAT scores—to support a broad conclusion.

ignores the possibility that the students with higher SAT scores might find the teaching quality merely satisfactory.

Correct! Wrong!

Which one of the following most accurately expresses the main conclusion of the argument?

Deep-sea trawling is the most efficient method of commercial fishing currently in use.

The coral and sponge habitats of the ocean floor are necessary for the sustained survival of commercial fish species.

Deep-sea trawling should be banned because it destroys valuable marine habitats.

Despite its short-term benefits, deep-sea trawling is detrimental to the fishing industry's long-term interests.

Reduced fish populations are a direct result of the long-term devastation of ocean floor habitats.

Correct! Wrong!

Which one of the following exhibits a pattern of reasoning most similar to that exhibited by the argument above?

If the store is open, then the lights are on. The lights are not on, so the store is not open.

If the alarm sounds, the security system is functioning. The alarm is sounding, so the security system is functioning.

If a runner trains hard, they will improve their time. This runner improved their time, so they must have trained hard.

If the forecast calls for rain, then I will carry an umbrella. The forecast did not call for rain, so I will not carry an umbrella.

If an investment is risky, then it offers a high potential return. This investment offers a high potential return, so it must be risky.

Correct! Wrong!

Which one of the following statements can be properly inferred from the stimulus?

Some employees who achieved two major project milestones were not recently hired.

Every employee who was not recently hired will receive the annual performance bonus.

No employee who was recently hired achieved two major project milestones this year.

Any employee who achieved one major project milestone this year was recently hired.

Only employees who achieved at least two major project milestones were eligible for the bonus.

Correct! Wrong!

The bolded statement plays which one of the following roles in the argument?

It serves as the main conclusion that the rest of the argument is intended to support.

It is the evidence used to undermine the reliability of the study's conclusion.

It is a principle that links the study's findings to the argument's conclusion.

It is an intermediate conclusion drawn from the fact that human memory is fallible.

It is a restatement of the study's main finding, which the argument then attacks.

Correct! Wrong!

The conclusion above follows logically if which one of the following is assumed?

The new trade agreement will not be ratified only if the regional economy is not significantly boosted.

If the regional economy is significantly boosted, then the new trade agreement was ratified.

The new trade agreement is only ratified if it provides a significant boost to the regional economy.

The regional economy will not be significantly boosted.

The regional economy is already significantly boosted.

Correct! Wrong!

Which one of the following, if true, most seriously weakens the researchers' conclusion?

The life-span increase was only observed in male mice, not female mice.

The mice that received Compound Z ate significantly less food than the control group did.

Compound Z has no known effect on the human equivalent of the key aging process in mice.

The researchers found that Compound Z improved the mice's ability to fight off common bacterial infections.

The control group of mice was given an inactive placebo instead of the compound.

Correct! Wrong!

The legislator's argument is most strongly supported by which one of the following principles?

Public funds should not be used for any project unless the majority of taxpayers approve it.

It is unfair for the public to subsidize a private endeavor when the costs are broadly shared but the benefits are narrowly concentrated.

Any project that generates long-term tax revenue is preferable to one that requires high initial investment.

The state should prioritize job-creation projects that provide benefit to low-income residents.

All state expenditures must be justified by demonstrating a clear, direct, and quantifiable benefit to every citizen.

Correct! Wrong!

The financial advisor's argument is flawed because it:

attempts to refute a claim by attacking the source of the claim rather than the merits of the claim itself.

takes for granted that formal training is the only way to gain expertise in market analysis.

confuses a necessary condition for a sufficient condition for a sound market prediction.

fails to consider that the pundit's prediction might be correct, even if the reasoning supporting it is weak.

assumes that the pundit has made incorrect predictions in the past.

Correct! Wrong!

The statement that 'Geothermal energy is undeniably cleaner than fossil fuels' serves which one of the following functions in the argument?

It is the main conclusion of the argument, summarizing the argument’s core finding.

It is a premise that the author uses to support the conclusion that geothermal energy is a supplement.

It is background information that is then rejected as irrelevant to the core conclusion about geothermal's viability.

It is a piece of evidence offered to illustrate the geographic limitations of geothermal power.

It is a concession to a potential opposing viewpoint, preceding the introduction of the argument’s main conclusion.

Correct! Wrong!

Which one of the following must be true based on the statements above?

No company that prioritizes short-term profits is highly likely to remain technologically competitive in the long term.

If a company remains technologically competitive in the long term, then it did not prioritize short-term profits.

Companies that do not invest heavily in R&D are guaranteed to fail in the long term.

Only companies that prioritize R&D will remain technologically competitive in the long term.

Some companies that prioritize short-term profits will still invest in R&D.

Correct! Wrong!

The pattern of flawed reasoning in the argument above is most similar to that in which one of the following?

My doctor told me to start exercising more, but he just ate a large cheeseburger, so I'm going to ignore his advice.

The meteorologist predicted rain for today, but since the sun is out now, the meteorologist must have been mistaken about the weather.

The political analyst claimed that the incumbent would lose, but she was wrong about every single election result four years ago, so she is wrong now.

The historian argued that the war was caused by economic factors, but he offered no evidence to support his claims, so his argument is unsound.

The restaurant review was highly positive, but since I know the reviewer is a fan of all spicy food, I cannot trust their rating of this particular dish.

Correct! Wrong!

LSAT Logical Reasoning Quiz

Outstanding LSAT Logic!

You have an outstanding command of LSAT Logical Reasoning concepts and flawless analytical skills. Keep up the great work!

Strong Performance!

You're demonstrating a solid grasp of LSAT logic. Focus on reviewing specific flaw types and assumption questions to maximize your score.

Good Foundation!

You have a good foundation, but consistent practice with timed sections and detailed explanations is key to improving your speed and accuracy on the LSAT.

Answer key and Explanation here.

LSAT Logical Reasoning Practice Test

Which one of the following, if true, most seriously weakens the environmental planner's argument?

Which one of the following, if true, most strengthens the analyst's argument?

Which one of the following is an assumption that the argument requires?

The reasoning in the professor's argument is flawed because it:

Which one of the following most accurately expresses the main conclusion of the argument?

Which one of the following exhibits a pattern of reasoning most similar to that exhibited by the argument above?

Which one of the following statements can be properly inferred from the stimulus?

The bolded statement plays which one of the following roles in the argument?

The conclusion above follows logically if which one of the following is assumed?

Which one of the following, if true, most seriously weakens the researchers' conclusion?

The legislator's argument is most strongly supported by which one of the following principles?

The financial advisor's argument is flawed because it:

The statement that 'Geothermal energy is undeniably cleaner than fossil fuels' serves which one of the following functions in the argument?

Which one of the following must be true based on the statements above?

The pattern of flawed reasoning in the argument above is most similar to that in which one of the following?

About the author

Ambreena

Which one of the following, if true, most seriously weakens the environmental planner's argument?

Which one of the following, if true, most strengthens the analyst's argument?

Which one of the following is an assumption that the argument requires?

The reasoning in the professor's argument is flawed because it:

Which one of the following most accurately expresses the main conclusion of the argument?

Which one of the following exhibits a pattern of reasoning most similar to that exhibited by the argument above?

Which one of the following statements can be properly inferred from the stimulus?

The bolded statement plays which one of the following roles in the argument?

The conclusion above follows logically if which one of the following is assumed?

Which one of the following, if true, most seriously weakens the researchers' conclusion?

The legislator's argument is most strongly supported by which one of the following principles?

The financial advisor's argument is flawed because it:

The statement that 'Geothermal energy is undeniably cleaner than fossil fuels' serves which one of the following functions in the argument?

Which one of the following must be true based on the statements above?

The pattern of flawed reasoning in the argument above is most similar to that in which one of the following?

You may also like

About the author

Ambreena