LSAT Reading Purpose Questions Practice Questions with Answers

LSAT Reading Purpose Questions Practice Questions with Answers

Earning a high score on the Law School Admission Test requires more than just identifying what a text says; you must understand why the author said it. LSAT Reading Purpose questions test your ability to discern the rhetorical function of specific words, sentences, or entire paragraphs within a passage. These questions are a staple of the LSAT Prep curriculum because they bridge the gap between basic comprehension and logical analysis.

Concept Explanation

LSAT Reading Purpose questions ask you to identify the functional role that a specific element plays in the context of the author’s larger argument. Instead of asking for a summary of the content, these questions focus on the "why"—for instance, why a particular example was included or why a specific counterargument was mentioned. To answer these correctly, you must look beyond the literal meaning of the text and determine how that text serves the author's primary goal. Common phrasing for these questions includes "The author mentions [X] primarily in order to..." or "What is the primary function of the third paragraph?"

Success on these questions hinges on your ability to recognize structural cues. According to the Law School Admission Council (LSAC), the Reading Comprehension section measures the ability to read, with understanding and insight, examples of lengthy and complex materials. When you encounter a purpose question, you should follow this three-step process:

1. Identify the Target: Locate the specific line or phrase mentioned in the question stem.
2. Contextualize: Read the sentences immediately preceding and following the target to see what claim it supports or refutes.
3. Determine the Function: Ask yourself, "If I removed this sentence, what would the argument lose?" (e.g., an example, a clarification, a concession, or a piece of evidence).

Solved Examples

Example 1: The Function of a Counter-Example

Passage Snippet: "While many economists argue that deregulation always leads to lower consumer prices, the airline industry in the 1980s provides a stark contrast. During this period, despite increased competition, hub-and-spoke pricing models actually led to higher fares for travelers in mid-sized markets."

Question: The author mentions the "airline industry in the 1980s" primarily in order to:

1. Identify the target: "Airline industry in the 1980s."
2. Contextualize: It follows a general claim about deregulation and lower prices.
3. Determine function: It serves as a counter-example to challenge the economists' general rule.
4. Answer: Challenge a generalization made by certain economists.

Example 2: The Function of a Technical Definition

Passage Snippet: "In legal terms, 'strict liability' refers to a standard of liability under which a person is legally responsible for the consequences flowing from an activity even in the absence of fault. By establishing this baseline, the court was able to bypass the lengthy process of proving negligence."

Question: The author’s primary purpose in providing the definition of "strict liability" is to:

1. Identify the target: The definition of "strict liability."
2. Contextualize: The next sentence explains that this definition allowed the court to "bypass" a process.
3. Determine function: The definition explains the mechanism that allowed for a specific legal outcome.
4. Answer: Explain the legal basis for a specific procedural shortcut used by the court.

Example 3: The Function of a Concession

Passage Snippet: "Admittedly, the new carbon capture technology is prohibitively expensive for smaller manufacturing plants. However, the long-term environmental benefits and the potential for federal subsidies make it a viable path for the industry at large."

Question: The author mentions the cost for "smaller manufacturing plants" primarily to:

1. Identify the target: Cost for smaller plants.
2. Contextualize: It begins with "Admittedly" and is followed by "However."
3. Determine function: It acknowledges a weakness in the technology (a concession) before reinforcing the main argument.
4. Answer: Acknowledge a potential objection to the technology before arguing for its overall utility.

Practice Questions

1. In a passage discussing the evolution of jazz, the author mentions the "syncopated rhythms of West African drum circles." The author most likely mentions these rhythms in order to:

2. A passage describes a new archaeological dating method. The author states that "previous methods often resulted in a margin of error of up to 500 years." This statement serves primarily to:

3. In a legal analysis of patent law, the author cites a 1994 Supreme Court case involving software copyrights. The primary purpose of citing this case is to:

4. An author arguing for the protection of biodiversity mentions that "the Pacific Yew tree was once considered a 'weed tree' before it was discovered to contain a potent anti-cancer compound." The author mentions the Pacific Yew primarily to:

5. In a passage about Victorian literature, the author describes the "serialized format of 19th-century novels." The author mentions this format primarily to help explain:

6. A scientific passage about plate tectonics mentions the "movement of glacial deposits across continents that are now separated by oceans." This information is provided primarily to:

7. In an essay about urban planning, the author mentions "Jane Jacobs’ critique of mid-century high-rise housing projects." The author most likely refers to Jacobs in order to:

8. A passage discussing the philosophy of mind mentions "the Turing Test." The author’s primary purpose in mentioning the Turing Test is to:

Answers & Explanations

1. Answer: Trace the historical roots of a musical genre.
Explanation: By linking jazz to West African drum circles, the author is establishing a lineage or historical foundation for the musical style being discussed.

2. Answer: Highlight the limitations of existing technology to justify a new approach.
Explanation: Pointing out the large margin of error in old methods creates a "problem" that the new method mentioned in the passage is designed to solve.

3. Answer: Provide legal precedent for a specific interpretation of patent scope.
Explanation: Citing a court case in a legal passage almost always serves to provide an authoritative example or precedent that supports the author's argument.

4. Answer: Illustrate the unforeseen value that seemingly insignificant species can possess.
Explanation: The Pacific Yew example shows that we shouldn't dismiss "weed trees" because they might have hidden benefits, supporting the broader argument for biodiversity.

5. Answer: Why many novels of the era featured episodic structures and cliffhangers.
Explanation: Serialized publication (releasing chapters one by one) directly influenced the pacing and structure of the writing, which is the functional link here.

6. Answer: Offer empirical evidence supporting the theory of continental drift.
Explanation: Glacial deposits across separated oceans are a physical "footprint" that proves the continents were once joined, serving as evidence for the theory.

7. Answer: Introduce a significant historical shift in architectural theory.
Explanation: Referring to a famous critic like Jacobs usually serves to mark a turning point or to introduce a dominant school of thought that challenged the status quo.

8. Answer: Present a criterion used to evaluate the presence of machine intelligence.
Explanation: The Turing Test is a functional tool or "yardstick" mentioned to explain how researchers determine if a machine can "think." For more practice with logic and evidence, see our Reading Comprehension Questions guide.

Frequently Asked Questions

What is the difference between a main idea question and a purpose question?

A main idea question asks what the passage is about (content), whereas a purpose question asks why a specific part of the passage was included (function). The purpose always supports the main idea but focuses on the rhetorical strategy used to convey it.

How can I identify the "context" for a purpose question?

Read the two sentences before and the two sentences after the specific phrase mentioned in the question. Look for transition words like "however," "therefore," or "for example," which signal the relationship between that phrase and the surrounding argument.

Do I need outside knowledge to answer LSAT Reading Purpose questions?

No, you should never use outside information to answer these questions. All the information necessary to determine the function of a phrase is contained within the passage itself, and using external facts can often lead to choosing a "distractor" answer.

What are common "trap" answers in purpose questions?

Trap answers often accurately summarize the content of the lines mentioned but fail to explain their function. Another common trap is an answer that describes a purpose that is true for the passage as a whole but not for the specific lines being asked about.

Should I re-read the whole passage for every purpose question?

No, you should use your initial passage map to locate the relevant section and then perform a targeted read of the surrounding context. Re-reading the entire passage is a poor use of time on a standardized exam where every second counts.