LSAT (Law School Admission Test) · Logical Reasoning
Assumptions, Strengthening and Weakening
26 practice questions, each with the answer and an explanation.
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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 26 questions
- Ms. Alvarez argues that the city's bike-share program has reduced traffic congestion, because the number of cars entering the downtown area fell by 8 percent in the year after the program began.
Whic… - People who keep houseplants in their offices report lower stress than people who do not. A researcher concludes that houseplants reduce stress.
Which one of the following, if true, most strengthens t… - A bakery owner concludes that her new slogan raised sales, because sales were 10 percent higher in the month after the slogan was introduced than in the month before.
Which one of the following, if t… - Every member of the committee who attended the retreat voted for the plan. Mr. Chen voted for the plan. Therefore Mr. Chen attended the retreat.
The conclusion follows logically if which one of the f… - Scientists hypothesize that a certain fungus is killing the frogs in Pond X.
Which one of the following, if true, most strengthens the hypothesis? - The crime rate in the town fell after the new police chief took office. This shows that she is an effective chief.
Which one of the following, if true, most weakens the argument? - A magazine's survey of its subscribers shows that 90 percent of those who replied approve of its new design. The editor concludes that the redesign has been a success with its readers.
Which one of t… - Studies find that people who regularly eat breakfast weigh less than people who do not. It follows that eating breakfast helps people to control their weight.
Which one of the following, if true, mos… - After a store installed security cameras, thefts there fell by 30 percent, and the manager concluded that the cameras caused the fall.
Which one of the following, if true, most strengthens the manage… - Fuel costs are rising. Therefore airlines will have to raise their fares.
Which one of the following is an assumption on which the argument depends? - A farm that used the new fertilizer produced a record harvest this year. So the new fertilizer is clearly effective.
Which one of the following, if true, most weakens the argument? - Drug X is effective: it lowered blood pressure in 70 percent of the patients who took it.
Which one of the following, if true, most strengthens the argument? - Ana scored highly on the college entrance test, so she will do well in college.
Which one of the following is an assumption on which the argument depends? - The weight-loss program must work: 90 percent of the people who completed the program lost weight.
Which one of the following, if true, most weakens the argument? - The mayor says that a new bus line increased shopping downtown, citing a 12 percent rise in sales at stores near the line.
Which one of the following, if true, most strengthens the mayor's claim? - People who take art classes report greater happiness than people who do not. A psychologist concludes that art classes make people happier.
Which one of the following, if true, most strengthens the p… - A tire company claims that its tires last longer than a competitor's, citing a test in which its tires lasted 10,000 miles longer on the company's own test track.
Which one of the following, if true… - The city should build a new stadium, since it will bring in tourists and thereby increase tax revenue.
Which one of the following is an assumption on which the argument depends? - Linguists argue that Language X is historically related to Language Y, because the two languages share about 400 words that sound alike.
Which one of the following, if true, most strengthens the ling… - A bridge has a weight limit of 10 tons. A truck weighs 12 tons. Therefore the truck cannot cross the bridge safely.
Which one of the following is an assumption on which the argument depends? - Theater attendance rose after ticket prices were cut, so cutting prices increases a theater's revenue.
Which one of the following, if true, most seriously weakens the argument? - Archaeologists claim that a settlement was abandoned suddenly, because tools and cooking pots were found in their usual places in many of the houses.
Which one of the following, if true, most strengt… - The best readers in the class were read to daily when they were young. So reading to young children makes them better readers.
Which one of the following is an assumption on which the argument depend… - In a study of 500 people, those who drink tea daily lived longer. The researchers conclude that drinking tea extends life.
Which one of the following, if true, most seriously weakens the researchers'… - A detective argues that the thief must be Lee. Only Lee and Park had keys to the room, and Park was out of town when the theft took place.
Which one of the following, if true, most strengthens the de… - A detective argues that the thief must be Lee. Only Lee and Park had keys to the room, and Park was out of town when the theft took place.
Which one of the following, if true, most seriously weakens…