LSAT Section 1 Logical Reasoning

Review 400 LSAT-SECTION-1-LOGICAL-REASONING practice questions with answer explanations and community insights.

Question 1

A chess tournament is occurring in the local community school, and the players at all four of the tables are engaged in their fourth game against their prospective opponents. The players with white pieces are: David, Gerry, Lenny and Terry The players with black pieces are: Don, Mike, Richie and Stephen The scores are 3:0, 2.5:0.5, 2:1, 1.5:1.5 [note: tied games result in a score of 0.5 points for each player] Lenny is playing at the table to the right of Stephen, who has lost all of his games until now. Gerry is playing against Mike. At least one game at table 1 has resulted in a tie. Richie, who is not in the lead over his opponent, has not been in a tied game. The player who is using the white pieces at table 4 is Terry, however, the current score at table 4 is not 2:1. Don is leading his match after his last three games. Which player has black pieces and is tied?

  1. Mike
  2. David
  3. Richie
  4. Don
  5. Terry

Question 2

A chess tournament is occurring in the local community school, and the players at all four of the tables are engaged in their fourth game against their prospective opponents. The players with white pieces are: David, Gerry, Lenny and Terry The players with black pieces are: Don, Mike, Richie and Stephen The scores are 3:0, 2.5:0.5, 2:1, 1.5:1.5 [note: tied games result in a score of 0.5 points for each player] Lenny is playing at the table to the right of Stephen, who has lost all of his games until now. Gerry is playing against Mike. At least one game at table 1 has resulted in a tie. Richie, who is not in the lead over his opponent, has not been in a tied game. The player who is using the white pieces at table 4 is Terry, however, the current score at table 4 is not 2:1. Don is leading his match after his last three games. Who is the winning player at table 4?

  1. Don
  2. Terry
  3. David
  4. Gerry
  5. Richie

Question 3

Larry has purchased a device that the manufacturer claims will reduce the fuel consumption in his car. After a month has passed, Larry determines that his mileage currently rests at 17 miles per gallon. Larry's best friend, Steve, owns the exact same make and model car, and has calculated his mileage at 23 miles per gallon. Steve's car does not have the device that Larry purchased one month ago. Larry then makes the conclusion that the manufacturer of the device's claim is not true. Which of the following statements would cause Larry's conclusion to be the weakest?

  1. Though Larry has the same make and model of car as Steve, Larry's car is 15 years older.
  2. Larry was driving in the city, whereas Steve drives the highway
  3. Larry purchases a lower grade of gasoline than Steve
  4. Steve lied, he actually only gets 15 miles per gallon
  5. Before buying the device, Larry had never before calculated the mileage of his car.

Question 4

If a petrochemical plant manufactures a range of hazardous chemical products and must therefore follow strict guidelines concerning each of the chemicals may interact with one another on a daily basis. The plant processes five different chemicals every week. Three of these chemicals can be processed on any given day. Xenon may be processed any day except for every other Monday and every other Thursday. Oxygen, however, can be processed only on Tuesdays and Wednesdays. Liquid Hydrogen may be processed on Mondays, Wednesdays and Fridays. Sulfur Dioxide can't be processed on Fridays. Methane can't be processed on Wednesday. What are the three chemicals that can be processed on any given Monday?

  1. Liquid Hydrogen, Xenon, and Oxygen
  2. Methane, Oxygen, and Sulfur Dioxide
  3. Methane, Xenon, and Oxygen
  4. Sulfur Dioxide, Methane, and Liquid Hydrogen
  5. Xenon, Oxygen, and Sulfur Dioxide

Question 5

If a petrochemical plant manufactures a range of hazardous chemical products and must therefore follow strict guidelines concerning each of the chemicals may interact with one another on a daily basis. The plant processes five different chemicals every week. Three of these chemicals can be processed on any given day. Xenon may be processed any day except for every other Monday and every other Thursday. Oxygen, however, can be processed only on Tuesdays and Wednesdays. Liquid Hydrogen may be processed on Mondays, Wednesdays and Fridays. Sulfur Dioxide can't be processed on Fridays. Methane can't be processed on Wednesday. Which weekday is most likely to be impossible for 3 chemicals to be processed in one day?

  1. Monday
  2. Tuesday
  3. Wednesday
  4. Thursday
  5. Friday
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