Bar Exam (Uniform) Quiz: Mistake Doctrine

20 questions · exam conditions

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Mistake DoctrineQuestion 1 of 20

A recent university graduate interviewed for a job at a prestigious consulting firm. The firm sent her an offer letter stating an annual salary of $90,000. The graduate, who had misread the number in her excitement, believed the offer was for $99,000. She accepted the offer in writing without mentioning the salary. The firm had no reason to know of her misreading of the offer. She discovered her error upon receiving her first paycheck.

Can the graduate rescind the employment contract based on her mistake? Select one.

No, because her unilateral mistake was not known to the firm and enforcement is not unconscionable.

Yes, if she can prove that she would not have accepted the job for $90,000.

Yes, because salary is a material term and there was no meeting of the minds.

No, because the parol evidence rule prevents her from contradicting the written offer she accepted.

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Bar Exam (Uniform) Quiz

Bar Exam (Uniform) Quiz: Mistake Doctrine

Practice Mistake Doctrine in Bar Exam (Uniform) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Mistake Doctrine, giving you a quick way to practice the rules, question types, and explanations that matter most for Bar Exam (Uniform).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Can the graduate rescind the employment contract based on her mistake? Select one.

No, because her unilateral mistake was not known to the firm and enforcement is not unconscionable. (correct answer)
Yes, if she can prove that she would not have accepted the job for $90,000.
Yes, because salary is a material term and there was no meeting of the minds.
No, because the parol evidence rule prevents her from contradicting the written offer she accepted.

Explanation: This question tests your understanding of unilateral mistake in contract formation. When one party makes a mistake that the other party doesn't know about, the general rule is that the contract remains enforceable unless specific exceptions apply. Option A is correct because the graduate's misreading of the salary constitutes a unilateral mistake — only she was mistaken about the terms. The firm had no reason to know of her error and acted in good faith. For a unilateral mistake to void a contract, it must either be known to the other party, or enforcement must be unconscionable (extremely unfair). Here, neither condition is met. The firm offered exactly what they intended, and enforcing the $90,000 salary isn't unconscionable. Option B is wrong because subjective intent ("would not have accepted") alone doesn't void a contract for unilateral mistake. The law requires objective manifestations of assent, and she objectively accepted the written offer. Option C misapplies the "meeting of the minds" concept. While salary is indeed material, there was actually a meeting of the minds regarding the objective terms. The firm intended $90,000 and wrote $90,000; the graduate accepted that written offer. Her subjective misunderstanding doesn't negate the objective agreement. Option D incorrectly invokes the parol evidence rule, which prevents contradicting written contracts with prior oral statements. That's not the issue here — this is purely about mistake in contract formation. Remember: unilateral mistakes rarely void contracts unless the other party knew of the mistake or enforcement would be unconscionable. Focus on what each party objectively communicated, not their subjective understanding.

Question 2

A general contractor solicited bids for a plumbing subcontract on a large commercial project. Four experienced plumbing companies submitted bids ranging from $450,000 to $480,000. A fifth company, new to the area, submitted a bid for $290,000. The general contractor's project manager noted the significant discrepancy but, without inquiry, immediately accepted the low bid in writing. The next day, the new company discovered a major clerical error in its calculations; it had omitted the cost of all piping materials. The company immediately notified the general contractor and sought to withdraw its bid.

Is the new company likely to succeed in having the contract rescinded? Select one.

No, because the company's own negligence in preparing the bid precludes it from seeking rescission.
No, because a binding contract was formed upon the general contractor's acceptance of the offer.
Yes, because enforcing the contract with the erroneous bid would be unconscionable.
Yes, because the significant price discrepancy gave the general contractor reason to know of the company's unilateral mistake. (correct answer)

Explanation: A contract is voidable due to unilateral mistake if the non-mistaken party had reason to know of the other party's mistake. Here, the bid of $290,000 was so much lower than the other bids (all clustered around $450,000-$480,000) that the general contractor had reason to know a mistake had likely been made. Despite this, the contractor accepted without inquiry. This makes the contract voidable by the mistaken party.

Question 3

You are representing a construction company that submitted a bid to a city to build a new park. Your client's bid was $500,000. The city's internal engineering estimate for the project was $750,000. The city manager, thrilled with the low bid, called your client and asked, "Is this bid of $500,000 correct? Are you sure you can do the work for this price?" Your client's president, without re-checking the numbers, replied, "Absolutely. We stand by our bid." The city accepted. Your client later found a calculation error that understated labor costs by $200,000.

Your client now wants to have the contract rescinded based on unilateral mistake. What is the city's strongest argument to enforce the contract? Select one.

The mistake was caused by your client's negligence, which bars relief based on unilateral mistake.
The city did not know the specific nature of the mistake and only suspected a low price.
Your client assumed the risk of any error by confirming the bid after being questioned. (correct answer)
The city detrimentally relied on the bid by awarding the contract and notifying other bidders.

Explanation: When a party has an opportunity to discover a mistake but fails to investigate and instead confirms the contract terms, courts may find that the party assumed the risk of the mistake. Here, the city's inquiry gave the client a clear opportunity to verify its calculations, but the client chose to confirm without investigation. This assumption of risk defeats the unilateral mistake defense, making the contract enforceable despite the computational error.

Question 4

A corporation and an inventor entered into a licensing agreement for a new technology. Both parties believed, based on their own research and the prevailing scientific understanding, that the technology did not infringe on any existing patents. A year later, a court in an unrelated case broadly interpreted a competitor's patent, making the licensed technology an infringement. This court decision was unexpected throughout the industry. The corporation now seeks to void the licensing agreement based on mistake.

What is the inventor's best argument against the corporation's claim of mistake? Select one.

The mistake pertained to a future event—the court's ruling—not a fact existing at the time of the contract. (correct answer)
The corporation bore the risk of patent infringement as part of its business judgment in licensing the technology.
The mistake was one of law, not fact, which is not grounds for rescission.
There was no mistake because the parties' belief was correct based on the information available at the time.

Explanation: Contract mistake doctrine requires that the mistake concern a fact that existed at the time of contract formation. When parties are mistaken about something that hasn't happened yet, courts generally don't allow rescission based on mistake. Here, both parties correctly understood the legal landscape when they signed the agreement—no existing patents covered the technology based on available information and prevailing legal interpretations. The court's subsequent broad reinterpretation of a competitor's patent was a future development that changed the legal consequences of their contract, not a pre-existing fact they misunderstood. Answer A correctly identifies that the mistake pertained to a future event (the court's ruling) rather than an existing fact. The parties weren't wrong about what existed when they contracted; they simply couldn't predict how a court would later interpret patent law. Answer B incorrectly focuses on risk allocation. While businesses do assume certain risks, this doesn't address whether a valid mistake occurred under contract law doctrine. Answer C mischaracterizes the situation as a mistake of law versus fact. The parties weren't confused about legal principles—they correctly understood the law as it existed and was interpreted at the time. Answer D is wrong because there was indeed a mistake in the parties' belief about infringement, just not the type that justifies rescission. Their belief proved incorrect when the court ruling made the technology infringing. Remember: For contract mistake claims, timing matters crucially. The mistake must concern facts existing at contract formation, not future developments that change the contract's value or legality.

Question 5

A ship owner contracted with a salvage company to recover a sunken ship and its cargo, which both parties believed to be resting in a specific location based on historical records. The contract was for a fixed price. After months of searching at the specified location, the salvage company found nothing. It was later discovered, through newly unearthed documents, that the ship had actually sunk 100 miles away in much deeper, more hazardous water.

Can the salvage company rescind the contract? Select one.

No, because a salvage company inherently assumes the risk that a sunken vessel may not be where it is believed to be.
No, because the salvage company is still capable of performing, even if it is more difficult.
Yes, because the location of the ship was a basic assumption of the contract, and the mutual mistake makes performance radically different. (correct answer)
Yes, because the ship owner breached an implied warranty that the historical records were accurate.

Explanation: The contract is voidable due to mutual mistake. The location of the wreck was a basic assumption upon which the contract was founded. The mistake about this fact makes performance by the salvage company something radically different and more burdensome than what was contemplated. While salvage operations involve risk, a mistake of this magnitude about the fundamental facts underlying the performance goes beyond the risks typically assumed and justifies rescission.

Question 6

A person booked a hotel room with a balcony overlooking the main street of a city for the night of a famous annual parade. The booking was made six months in advance at a premium rate. The sole purpose of the booking, known to the hotel, was to view the parade. Two months after the booking, the city announced that due to budget cuts, the parade was permanently canceled. The person sought to cancel the reservation and receive a full refund, but the hotel refused, citing its non-refundable booking policy.

Which legal doctrine provides the strongest basis for the person to cancel the contract and obtain a refund? Select one.

Mutual mistake, because both parties were mistaken about the future occurrence of the parade.
Unilateral mistake, because the person was mistaken in believing the parade was certain to happen.
Impracticability, because the hotel can no longer provide the primary benefit of the room.
Frustration of purpose, because a subsequent event completely destroyed the value of the contract for the buyer. (correct answer)

Explanation: This is a classic example of frustration of purpose. The doctrine of mistake does not apply because, at the time of contracting, both parties correctly believed the parade was scheduled to occur. The mistake doctrine applies to errors regarding an existing fact. Frustration of purpose applies when a later, unforeseen event, which was a basic assumption of the contract, completely or almost completely destroys the principal purpose of the contract for one party. Here, the cancellation of the parade frustrated the buyer's entire reason for booking the room.

Question 7

A landlord and tenant were negotiating a commercial lease. The parties agreed to a monthly rent of $3,500. When the landlord's agent typed the final lease document, she accidentally wrote "$ 2,500" in the space for the monthly rent. Both the landlord and the tenant signed the lease without noticing the error. When the first month's rent was due, the tenant tendered $2,500.

What is the landlord's best legal recourse? Select one.

To sue for reformation of the lease to reflect the agreed-upon rent of $3,500. (correct answer)
To enforce the lease as written for $2,500, as it is a signed contract.
To rescind the lease due to a mutual mistake and evict the tenant.
To argue there was no contract due to a lack of a meeting of the minds on the price.

Explanation: When you encounter contract formation issues involving clerical errors, focus on whether the parties had a true meeting of the minds versus whether there was merely a transcription mistake. This question tests the remedy of reformation, which applies when parties agree on terms but the written contract contains an error. Here, the landlord and tenant clearly agreed on $3,500 monthly rent during negotiations. The $2,500 figure resulted solely from the agent's typing error, not from any disagreement between the parties. This creates a situation where the written contract doesn't reflect their actual agreement, making reformation the appropriate remedy. Answer A is correct because reformation allows courts to correct written contracts that don't accurately reflect the parties' true agreement due to mutual mistake or clerical error. Since both parties intended $3,500 but the document incorrectly states $2,500, a court can reform the lease to match their actual agreement. Answer B is wrong because while contracts are generally enforced as written, reformation provides an exception when the writing doesn't reflect the true agreement due to error. Answer C is incorrect because rescission would terminate the entire lease, which isn't necessary here since the parties want the lease—just with the correct rent amount. Answer D fails because there was a meeting of the minds on price ($3,500). The error occurred in transcription, not in the parties' understanding of their agreement. Study tip: Remember that reformation corrects writing errors when parties' true intent is clear, while rescission cancels contracts entirely. Look for situations where parties agreed but the document contains obvious mistakes.

Question 8

A homeowner found an unusually heavy and lustrous stone in her backyard. She took it to a local gemologist who, after a brief inspection, identified it as a large piece of topaz and offered to buy it for $200. The homeowner, believing it was topaz, agreed and sold the stone. The gemologist also believed it was topaz at the time of the purchase. A month later, upon cutting the stone, the gemologist discovered it was not topaz but a large, uncut diamond worth approximately $75,000.

The homeowner learned of the stone's true identity and sued the gemologist to rescind the contract. What is the likely outcome of the lawsuit? Select one.

The homeowner will win, because there was a mutual mistake as to a basic assumption of the contract that had a material effect on the agreed exchange. (correct answer)
The homeowner will lose, because she bore the risk of not knowing the stone's true value when she sold it.
The gemologist will win, because the mistake related to the stone's value, not its identity.
The gemologist will win, because as a merchant, the gemologist is entitled to the benefit of their superior knowledge and subsequent discovery.

Explanation: The contract is voidable based on mutual mistake. Both the homeowner (seller) and the gemologist (buyer) were mistaken about a basic assumption on which the contract was made—the identity of the stone (topaz vs. diamond). This mistake had a material effect on the agreed exchange, as the stone was worth vastly more than the contract price. The homeowner did not bear the risk of this mistake, as it was a shared error about the fundamental nature of the object, not merely its market value.

Question 9

The homeowner learned of the stone's true identity and sued the gemologist to rescind the contract. What is the likely outcome of the lawsuit? Select one.

The homeowner will win, because there was a mutual mistake as to a basic assumption of the contract that had a material effect on the agreed exchange. (correct answer)
The homeowner will lose, because she bore the risk of not knowing the stone's true value when she sold it.
The gemologist will win, because the mistake related to the stone's value, not its identity.
The gemologist will win, because as a merchant, the gemologist is entitled to the benefit of their superior knowledge and subsequent discovery.

Question 10

You are representing a client who purchased a classic car from a private seller. The written contract included a clause stating the car was sold "as is, with all faults." Your client test-drove the car and had a mechanic perform a basic inspection, which revealed no major issues. Both your client and the seller believed the car's engine was the original one installed at the factory. A month after the purchase, your client learned from a classic car expert that the engine was a later, less valuable replacement. A thorough expert inspection at the time of sale would have revealed this fact.

Your client wants to rescind the contract based on mutual mistake. What is the seller's strongest defense? Select one.

The mistake about the engine was not material to the contract's formation.
The "as is" clause in the contract effectively allocated the risk of unknown defects to your client. (correct answer)
Your client's mechanic was negligent in failing to discover that the engine was not original.
The seller did not misrepresent the status of the engine, so there is no basis for rescission.

Explanation: A party cannot void a contract for mistake if they bore the risk of that mistake. An "as is" clause is a common way to allocate the risk of unknown defects to the buyer. By agreeing to this term, the buyer accepts the property in its current condition and assumes the risk that it may have hidden flaws. This is the seller's strongest argument against a claim of mutual mistake.

Question 11

A buyer entered into a written agreement to purchase a vacant lot from a seller for the purpose of building a gas station. Both parties believed the property's zoning classification permitted this use. The local zoning map, which both parties had consulted, was clear on this point. However, unbeknownst to either party, the city council had, one week prior to the contract signing, passed an ordinance rezoning that specific parcel to residential-only. This change had not yet been updated on the publicly available map.

Upon discovering the zoning change, can the buyer rescind the contract? Select one.

No, because changes in governmental regulations are a risk assumed by purchasers of real property.
No, because the mistake was one of law, not of fact, and ignorance of the law is not a defense.
Yes, because there was a mutual mistake about an existing fact that was a basic assumption of the contract. (correct answer)
Yes, because the seller implicitly warranted that the property was suitable for the buyer's intended purpose.

Explanation: The contract is voidable based on mutual mistake. At the time of contracting, an existing fact (the legal zoning status of the property) was different from what both parties believed it to be. The permitted use of the land was a basic assumption on which the contract was made, and the mistake has a material effect on the buyer. Modern contract law generally allows rescission for mutual mistakes of law, treating them similarly to mistakes of fact.

Question 12

A buyer purchased a commercial building from a seller. During negotiations, the buyer stated her intention to open a brewery, which would require significant water usage. The seller, who honestly believed the building had high-capacity water service, responded, "That's great, the infrastructure here should be perfect for that." In fact, the building had only standard residential-grade water service, a fact unknown to both parties. The contract of sale contained no representations or warranties about the water service. The cost to upgrade the service is substantial.

Can the buyer successfully rescind the contract based on mistake? Select one.

No, because the seller's statement was merely an opinion and not a statement of fact.
No, because the buyer bore the risk of performing due diligence on the building's suitability for her specific purpose.
Yes, because the adequacy of the water service was a mutually mistaken assumption material to the contract. (correct answer)
Yes, because the seller's statement constituted a negligent misrepresentation that induced the contract.

Explanation: This is a case of mutual mistake. Both parties believed the building had infrastructure suitable for a brewery, a basic assumption on which the contract was formed. The lack of adequate water service is a material mistake because it substantially frustrates the buyer's purpose, which was known to the seller, and requires a significant unforeseen expense. While there may also be a misrepresentation claim, mutual mistake provides a strong basis for rescission.

Question 13

Can the graduate rescind the employment contract based on her mistake? Select one.

No, because her unilateral mistake was not known to the firm and enforcement is not unconscionable. (correct answer)
Yes, if she can prove that she would not have accepted the job for $90,000.
Yes, because salary is a material term and there was no meeting of the minds.
No, because the parol evidence rule prevents her from contradicting the written offer she accepted.

Question 14

Can the salvage company rescind the contract? Select one.

No, because a salvage company inherently assumes the risk that a sunken vessel may not be where it is believed to be.
No, because the salvage company is still capable of performing, even if it is more difficult.
Yes, because the location of the ship was a basic assumption of the contract, and the mutual mistake makes performance radically different. (correct answer)
Yes, because the ship owner breached an implied warranty that the historical records were accurate.

Question 15

An art collector purchased a sealed crate at an estate auction for $500. The auction catalog described the item only as "Crate #7: Contents Unknown, Artist's Studio." Neither the collector nor the auctioneer knew what the crate contained. When asked, the auctioneer said, "It could be full of masterpiece sketches or it could be full of junk. You pay your money and you take your chances." After the sale, the collector opened the crate and found it contained only old, empty paint cans. The collector sued the estate for rescission based on mutual mistake.

Will the collector's suit for rescission likely succeed? Select one.

Yes, because both parties were mistaken as to the existence of valuable art in the crate.
Yes, because the value of the paint cans is so minimal that it constitutes a total failure of consideration.
No, because the parties were consciously ignorant of the crate's contents and allocated the risk to the collector. (correct answer)
No, because the auctioneer's statement was a misrepresentation that induced the collector to buy the crate.

Explanation: A party bears the risk of a mistake when they are aware at the time of contracting that they have only limited knowledge of the facts but treat that limited knowledge as sufficient. This is the doctrine of "conscious ignorance." Here, both parties knew they did not know the contents of the crate. The auctioneer's statement explicitly framed the transaction as a gamble, thereby allocating the risk of the contents being valueless to the buyer. Therefore, rescission for mistake is not available.

Question 16

A collector purchased a vintage baseball card from a dealer for $5,000. Both parties believed the card was in "near-mint" condition. The price paid was fair for a near-mint card of that type. Upon returning home, the collector examined the card under magnification and discovered a tiny, almost invisible crease, which technically lowered its grade to "excellent" condition. The market value of the card in excellent condition is $4,800. The collector sued to rescind the contract based on mutual mistake.

What is the dealer's strongest defense against the collector's claim for rescission? Select one.

The collector, as a knowledgeable party, assumed the risk of minor condition flaws.
The mistake about the card's precise grade was not material to the agreed-upon exchange. (correct answer)
The dealer provided the exact card that was the subject of the contract.
The collector had an opportunity to inspect the card and was negligent in failing to find the crease.

Explanation: For a contract to be voidable due to mutual mistake, the mistake must have a material effect on the agreed-upon exchange. Materiality is a matter of degree. Here, the difference in value between what was expected (

5,000) and what was received (

4,800) is only 4%. A court would likely find this discrepancy to be immaterial and not a sufficient basis to undo the entire transaction, although the collector might have a claim for damages for breach of warranty.

Question 17

A buyer and a seller orally agreed to the sale of the seller's property located at 123 Oak Street. They hired a lawyer to draft the purchase agreement. Due to a typographical error by the lawyer's assistant, the final written contract identified the property as 132 Oak Street, a different property also owned by the seller. Both parties signed the contract without noticing the error. When the error was discovered before closing, the seller refused to convey 123 Oak Street.

What is the buyer's most appropriate remedy to obtain the property at 123 Oak Street? Select one.

Rescission of the written contract due to mutual mistake.
Damages for the seller's breach of the oral agreement.
Specific performance of the written contract for 132 Oak Street.
Reformation of the written contract to reflect the parties' true agreement. (correct answer)

Explanation: When a written agreement fails to express the actual agreement of the parties because of a mistake in drafting (a scrivener's error), the proper remedy is reformation. Reformation corrects the written document to conform to the parties' original intent. Here, both parties intended the contract to be for 123 Oak Street. Reformation will allow the court to enforce the deal as it was actually made.

Question 18

Will the collector's suit for rescission likely succeed? Select one.

Yes, because both parties were mistaken as to the existence of valuable art in the crate.
Yes, because the value of the paint cans is so minimal that it constitutes a total failure of consideration.
No, because the parties were consciously ignorant of the crate's contents and allocated the risk to the collector. (correct answer)
No, because the auctioneer's statement was a misrepresentation that induced the collector to buy the crate.

Question 19

Can the buyer successfully rescind the contract based on mistake? Select one.

No, because the seller's statement was merely an opinion and not a statement of fact.
No, because the buyer bore the risk of performing due diligence on the building's suitability for her specific purpose.
Yes, because the adequacy of the water service was a mutually mistaken assumption material to the contract. (correct answer)
Yes, because the seller's statement constituted a negligent misrepresentation that induced the contract.

Question 20

A farmer owned a large tract of agricultural land near a small town. Believing that the town's growth was stagnant, the farmer sold the land to a developer for $250,000, which was its fair market value for agricultural use. The developer also believed the land had limited short-term development potential but bought it as a long-term investment. Three months after the sale closed, a major technology company unexpectedly announced it was building a new headquarters in the town, causing local land values to triple overnight. The farmer sued the developer to rescind the contract.

Is the farmer likely to succeed in rescinding the contract? Select one.

Yes, because both parties were mistaken about the true development potential of the land.
Yes, because the dramatic increase in value demonstrates that the mistake was material.
No, because the mistake related to a future event and the land's market value, not an existing fact. (correct answer)
No, because the developer, as a sophisticated party, assumed the risk of changes in land value.

Explanation: The doctrine of mistake applies to a mistaken belief about an existing fact at the time the contract is made. It does not apply to predictions or judgments about future events or market conditions. Here, both parties' beliefs about the land's value were based on existing facts; the subsequent announcement was a future event that changed the land's value. This is not a mistake that would allow for rescission.