Bar Exam (Uniform) Quiz: Actual Cause

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Actual CauseQuestion 1 of 20

Two hunters were in a field. They saw movement in some bushes and, without properly identifying their target, both negligently fired their shotguns in that direction at the same time. A third person, who had been hiding in the bushes, was struck by a single pellet and lost an eye. It is scientifically impossible to determine which of the two hunters fired the shot that caused the injury. The injured person sued both hunters.

The injured person moves for summary judgment against one of the hunters on the issue of actual causation. What is the likely result? Select one.

The motion will be denied, because the injured person cannot prove that but for this hunter's shot, the injury would not have occurred.

The motion will be granted, because both hunters were negligent and the burden shifts to them to disprove causation.

The motion will be denied, because the hunters' conduct was not the proximate cause of the injury.

The motion will be granted, because the hunters were engaged in a joint enterprise, making them vicariously liable.

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Bar Exam (Uniform) Quiz

Bar Exam (Uniform) Quiz: Actual Cause

Practice Actual Cause 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 Actual Cause, 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

The injured person moves for summary judgment against one of the hunters on the issue of actual causation. What is the likely result? Select one.

The motion will be denied, because the injured person cannot prove that but for this hunter's shot, the injury would not have occurred. (correct answer)
The motion will be granted, because both hunters were negligent and the burden shifts to them to disprove causation.
The motion will be denied, because the hunters' conduct was not the proximate cause of the injury.
The motion will be granted, because the hunters were engaged in a joint enterprise, making them vicariously liable.

Explanation: The correct answer is A. This is a classic alternative liability scenario (like Summers v. Tice). Under the strict but-for test, the plaintiff cannot prove that either hunter was the actual cause, because he cannot show that 'but for' Hunter A's shot, he would have been safe (as Hunter B's shot might have caused the harm). While the law addresses this by shifting the burden of proof to the defendants to exonerate themselves, this is a legal fiction used at trial. The plaintiff cannot win summary judgment because he cannot, by himself, satisfy the but-for test, creating a genuine issue of material fact.

Question 2

A construction company was working on a high-rise building. In violation of safety regulations, the company failed to install a required safety net below a work area on the 20th floor. A worker in that area was struck by a small piece of falling debris from a floor above, causing him to lose his balance and fall. The worker was not wearing his personal safety harness, also a violation of regulations. The fall was from such a height that it would have been fatal regardless of the presence of the safety net, which was designed only to catch tools and small objects, not people.

The worker's estate brought a negligence action against the construction company based on its failure to install the safety net. The company moved for summary judgment. Which of the following is the company's best argument for why its negligence was not the actual cause of the worker's death? Select one.

The worker's failure to wear a safety harness constituted contributory negligence, barring recovery.
The absence of the safety net was not a but-for cause of the death because the net would not have prevented the fatality. (correct answer)
The falling debris was an intervening cause that broke the chain of causation.
The company's duty to provide a safety net did not extend to protecting workers from falls of this magnitude.

Explanation: The correct answer is B. The plaintiff must show that but for the defendant's negligence, the injury would not have occurred. Here, the defendant's negligence was the failure to install the safety net. However, the facts state that the net was not designed to catch a person and would not have prevented the death. Therefore, the worker would have died even if the net had been in place. The absence of the net was not a but-for cause of the death.

Question 3

A boat owner took his boat to a mechanic for engine repair. The mechanic negligently used a flammable sealant near the boat's fuel line. Later that day, the boat owner was working on the boat's electrical system and negligently created a spark, which ignited fumes from the sealant and started a fire. The fire destroyed the boat. Evidence showed the fire would not have started without both the flammable fumes (from the mechanic's negligence) and the spark (from the owner's negligence).

In a lawsuit by the boat owner against the mechanic, the mechanic argues his negligence was not the actual cause of the fire. Is this argument correct? Select one.

Yes, because the owner's subsequent negligence in creating the spark was a superseding cause.
Yes, because the owner's own negligence contributed to the fire, barring his recovery.
No, because but for the mechanic's use of the flammable sealant, the owner's spark would not have caused a fire. (correct answer)
No, because the mechanic, as a professional, is held to a higher standard of care.

Explanation: The correct answer is C. This is a case of concurrent causes where both negligent acts were necessary for the harm to occur. The but-for test applies. But for the mechanic's negligent use of the flammable sealant, there would have been no fumes to ignite, and the owner's spark would have been harmless. Therefore, the mechanic's negligence is a but-for cause of the fire. The owner's contributory negligence may reduce or bar his recovery depending on the jurisdiction, but it does not negate the element of actual causation with respect to the mechanic's conduct.

Question 4

A pharmaceutical company manufactured a popular over-the-counter painkiller. The company negligently failed to include a warning on its packaging about a rare but severe liver complication that could occur if the medication was taken with alcohol. A man, who regularly consumed alcohol, took the painkiller and subsequently died from the exact liver complication. His estate sued the company. At trial, the man's physician testified that she had repeatedly and explicitly warned the man never to mix any painkiller with alcohol due to his preexisting liver condition, and that the man had acknowledged understanding these warnings.

What is the company's best defense to the claim that its failure to warn was the actual cause of the man's death? Select one.

The man's voluntary consumption of alcohol was a superseding cause that cuts off the company's liability.
The physician's warnings were sufficient to inform the man of the risk, meaning the company's lack of a warning did not cause the harm. (correct answer)
The man assumed the risk of injury by consuming alcohol against his physician's direct medical advice.
The complication was so rare that the company's failure to warn was not the proximate cause of the injury.

Explanation: The correct answer is B. For a failure-to-warn claim, the plaintiff must show that but for the inadequate warning, the injury would not have occurred. This is often framed as showing the user would have behaved differently with an adequate warning. Here, the man already had actual knowledge of the specific danger from a more credible source (his own physician). Therefore, the additional warning on the package would have been redundant and would not have altered his behavior. The absence of the company's warning was not a but-for cause of his decision to mix the drug with alcohol.

Question 5

What is the company's best defense to the claim that its failure to warn was the actual cause of the man's death? Select one.

The man's voluntary consumption of alcohol was a superseding cause that cuts off the company's liability.
The physician's warnings were sufficient to inform the man of the risk, meaning the company's lack of a warning did not cause the harm. (correct answer)
The man assumed the risk of injury by consuming alcohol against his physician's direct medical advice.
The complication was so rare that the company's failure to warn was not the proximate cause of the injury.

Question 6

A homeowner purchased a fire extinguisher and kept it in his kitchen. The extinguisher was defectively manufactured and contained no fire-suppressing chemicals. One day, a small fire started in a trash can in the homeowner's kitchen due to his own carelessness. He grabbed the extinguisher, but it failed to work. By the time the fire department arrived, the fire had spread and caused significant damage to the kitchen. An expert witness testified that a working extinguisher of that size would have been completely ineffective against the fire, which was already too large and hot by the time the homeowner first noticed it.

The homeowner sued the manufacturer of the fire extinguisher for the damage to his kitchen. Which of the following is the manufacturer's best defense on the issue of actual causation? Select one.

The homeowner's carelessness in starting the fire was contributory negligence that bars recovery.
The product was not being used for its intended purpose because the fire was too large for that model of extinguisher.
The homeowner's failure to call the fire department immediately was a superseding cause.
The defective extinguisher was not a but-for cause of the damage because the damage would have occurred even with a functional product. (correct answer)

Explanation: This question tests your understanding of actual causation in tort law, specifically the "but-for" test. When analyzing causation, you must determine whether the defendant's breach actually caused the plaintiff's harm by asking: "But for the defendant's conduct, would the harm have occurred?" The manufacturer's best defense is that the defective extinguisher was not a but-for cause of the damage because the damage would have occurred even with a functional product (D). The expert testimony is crucial here—it establishes that even a working extinguisher would have been "completely ineffective" against this fire. Since the same damage would have occurred regardless of whether the extinguisher worked, the defect didn't actually cause the harm. The homeowner cannot prove that "but for" the defective extinguisher, his kitchen would have been saved. Let's examine why the other options fail: (A) addresses contributory negligence, which is an affirmative defense separate from causation—the homeowner's carelessness doesn't negate whether the defect caused additional harm. (B) mischaracterizes the situation; the extinguisher was being used for its intended purpose (fighting fires), even if it was inadequate for this particular fire's size. (C) incorrectly identifies a superseding cause; the homeowner's delay in calling firefighters doesn't break the causal chain from the manufacturer's defect. Remember: actual causation requires proving the defendant's conduct made a difference in the outcome. When expert testimony shows the same result would have occurred regardless of the defect, the but-for test fails, breaking the causation chain entirely.

Question 7

The worker's failure to wear a safety harness constituted contributory negligence, barring recovery.
The absence of the safety net was not a but-for cause of the death because the net would not have prevented the fatality. (correct answer)
The falling debris was an intervening cause that broke the chain of causation.
The company's duty to provide a safety net did not extend to protecting workers from falls of this magnitude.

Question 8

The injured person moves for summary judgment against one of the hunters on the issue of actual causation. What is the likely result? Select one.

The motion will be denied, because the injured person cannot prove that but for this hunter's shot, the injury would not have occurred. (correct answer)
The motion will be granted, because both hunters were negligent and the burden shifts to them to disprove causation.
The motion will be denied, because the hunters' conduct was not the proximate cause of the injury.
The motion will be granted, because the hunters were engaged in a joint enterprise, making them vicariously liable.

Question 9

A chemical plant negligently released a toxic plume of gas that drifted over a nearby town. Simultaneously, a fire at a different, unrelated facility also released a plume of the same toxic gas, which also drifted over the same town. The two plumes merged. The concentration of the gas from either plume alone was sufficient to cause respiratory injuries to the town's residents. A resident who suffered such an injury sued only the chemical plant.

The chemical plant argues it is not the actual cause of the resident's injury because the resident would have been injured anyway by the gas from the other facility's fire. How is a court that applies the substantial factor test likely to evaluate this argument? Select one.

The argument is valid because the but-for test for causation cannot be met.
The argument is invalid because the chemical plant and the other facility acted as joint tortfeasors.
The argument is valid because the fire at the other facility was a superseding cause.
The argument is invalid because the chemical plant's release was a substantial factor in causing the harm. (correct answer)

Explanation: When you encounter a tort question involving multiple potential causes of the same harm, you need to distinguish between the traditional "but-for" causation test and the "substantial factor" test. Courts apply the substantial factor test specifically when multiple forces are operating that could each independently cause the plaintiff's injury. Here, both gas plumes were sufficient to cause respiratory injuries on their own, and they merged over the town. Under the substantial factor test, the chemical plant's negligent release was clearly a substantial factor in bringing about the resident's harm, even though the fire would have caused the same injury independently. This makes the plant liable for the full damages. Let's examine why the other options miss the mark. Option A incorrectly focuses on the but-for test, which courts abandon in favor of the substantial factor test precisely because of situations like this where multiple sufficient causes exist. Option B mischaracterizes the legal relationship—while both facilities may be liable, the key issue here is causation, not whether they're joint tortfeasors (which typically requires some connection between the defendants). Option C wrongly applies superseding cause doctrine, which involves an intervening force that breaks the causal chain; here, both releases were simultaneous and independent, not sequential. Remember this pattern: when you see multiple independent causes that could each produce the same harm, courts will likely apply the substantial factor test rather than strict but-for causation. Each defendant remains fully liable for harm their conduct substantially contributed to causing.

Question 10

A warehouse stored valuable electronics. A security company was hired to patrol the premises. One night, a security guard negligently left a side gate unlocked. That same night, a team of sophisticated thieves disabled the electronic alarm system, cut through a section of the warehouse's rear wall, and stole the electronics. They never approached or used the side gate that the guard had left unlocked. The warehouse owner sued the security company for the value of the stolen goods.

The security company moves for summary judgment on the issue of causation. How is the court most likely to rule? Select one.

Grant the motion, because the guard's negligence was not a but-for cause of the theft. (correct answer)
Deny the motion, because leaving a gate unlocked is a clear breach of the security company's duty.
Grant the motion, because the thieves' criminal actions were a superseding cause of the loss.
Deny the motion, because the guard's negligence increased the overall risk of a break-in at the facility.

Explanation: The correct answer is A. The plaintiff must prove that the defendant's breach was an actual cause of the harm. Here, the breach was leaving the side gate unlocked. However, the thieves did not use that gate; they entered by cutting through a wall. The theft would have occurred in exactly the same way even if the guard had properly locked the gate. Therefore, the guard's negligence was not a but-for cause of the warehouse owner's loss.

Question 11

Two factories are located on the same river, five miles apart. Factory A, located upstream, negligently discharged a small quantity of a harmless chemical into the river. Factory B, located downstream, negligently discharged a large quantity of a different chemical. The two chemicals reacted in the water to form a new, highly toxic compound that killed a large number of fish at a commercial fish farm located further downstream. Scientific evidence shows that neither chemical, on its own, would have caused any harm to the fish.

The fish farm owner sues Factory A for negligence. In its defense, Factory A argues that it cannot be held liable. What is Factory A's strongest argument regarding actual causation? Select one.

Factory A's discharge was not an actual cause because it was not foreseeable that its harmless chemical would react with another chemical downstream.
Factory A's discharge was not an actual cause because but for its discharge, the fish would still have been exposed to Factory B's chemical. (correct answer)
Factory A's discharge was not an actual cause because its small quantity of harmless chemical was not a substantial factor in the harm.
Factory A's discharge was not an actual cause because Factory B's much larger discharge constituted a superseding intervening force.

Explanation: The correct answer is B. This represents Factory A's strongest but ultimately unsuccessful argument. Factory A might argue that since Factory B's chemical would still be in the water regardless, Factory A's contribution was not necessary. However, this argument fails under proper but-for analysis because but for Factory A's discharge, the toxic compound would not have formed and the fish would not have died. Factory A's discharge is a but-for cause even though Factory B's discharge was also necessary.

Question 12

Two individuals, acting independently, were negligently driving their motorboats on a lake. They simultaneously created large wakes that converged at a swimmer's location. The combined force of the two wakes was sufficient to pull the swimmer under, causing him to drown. Expert testimony established that the wake created by either boat alone would not have been large enough to cause the swimmer to drown.

The swimmer's estate sues only one of the boat drivers. Which of the following statements correctly applies the but-for test to the defendant driver's conduct? Select one.

The defendant's conduct was not a but-for cause because the other driver's wake was also necessary for the harm to occur.
The defendant's conduct was a but-for cause because without it, the swimmer would not have drowned. (correct answer)
The but-for test is inconclusive, and the court must apply the substantial factor test to determine causation.
The defendant's conduct was not a but-for cause because his wake alone was insufficient to cause the drowning.

Explanation: The correct answer is B. This scenario involves two causes that are not independently sufficient but are collectively sufficient to cause the harm. The standard but-for test works perfectly here. But for the defendant driver's negligent wake, the remaining wake from the other boat would have been insufficient to cause the drowning. Therefore, the defendant's conduct is a necessary component of the causal chain and a but-for cause of the death.

Question 13

A patient was admitted to a hospital with a severe illness. The attending physician negligently failed to order a specific diagnostic test. The patient's condition worsened, and the patient died two days later. The patient's estate sued the physician for negligence. During discovery, it was revealed that the illness was extremely rare and aggressive. Expert testimony from both sides concluded with reasonable medical certainty that, even if the physician had ordered the test and made the correct diagnosis immediately upon admission, the patient's chance of survival would have been zero, as no effective treatment existed for the illness at such an advanced stage.

The physician moves for summary judgment on the issue of causation. What is the most likely outcome of the motion? Select one.

The motion will be granted, because the physician's negligence was not a but-for cause of the patient's death. (correct answer)
The motion will be denied, because the physician's failure to perform the test breached the standard of professional care.
The motion will be granted, because the physician is immune from liability for errors in judgment regarding rare diseases.
The motion will be denied, because the jury should be allowed to determine if the physician's negligence was a substantial factor in the patient's death.

Explanation: The correct answer is A. To establish negligence, the plaintiff must prove all elements, including actual causation. Under the but-for test, the plaintiff must show that the harm would not have occurred but for the defendant's breach. Here, the undisputed expert testimony shows the patient would have died even with a proper and timely diagnosis. Therefore, the physician's negligence was not the actual cause of death, and summary judgment is appropriate.

Question 14

A city negligently failed to replace a stop sign that had been knocked down at an intersection, making it a two-way stop instead of a four-way stop. A driver, who lived in the neighborhood and knew the intersection was supposed to be a four-way stop, approached the intersection. He saw there was no stop sign for his direction of travel but observed a car approaching from the cross-street. Believing he had the right-of-way, he proceeded into the intersection without stopping and was struck by the other car, which also failed to stop. The driver sued the city for his injuries.

What is the city's strongest argument that its negligence was not an actual cause of the driver's injuries? Select one.

The driver's decision to enter the intersection without stopping was a superseding cause.
The city is protected by sovereign immunity for decisions related to the placement of traffic signs.
The driver's negligence in failing to keep a proper lookout was greater than the city's negligence.
The city's negligence was not a but-for cause because the driver knew a stop was required and would have proceeded anyway. (correct answer)

Explanation: This question tests actual causation in negligence law, specifically the "but-for" test. To establish actual cause, a plaintiff must prove that but for the defendant's negligence, the harm would not have occurred. The city's strongest argument is that its negligence was not a but-for cause because the driver knew a stop was required and would have proceeded anyway (D). Even if the stop sign had been properly in place, the driver admitted he believed he had the right-of-way and proceeded without stopping. Since he would have entered the intersection regardless of whether the sign was there, the city can argue that replacing the sign wouldn't have prevented his injuries. This breaks the causal chain between the city's negligence and the harm. Looking at the wrong answers: (A) misapplies superseding cause doctrine—the driver's conduct was foreseeable given the missing sign, so it wouldn't break proximate causation. (B) raises sovereign immunity, but this addresses liability generally, not actual causation specifically, and many jurisdictions have waived immunity for traffic control negligence. (C) discusses comparative negligence and the degree of fault, but this affects damages allocation, not whether actual causation exists in the first place. When tackling causation questions, always distinguish between but-for causation (would the harm have occurred anyway?) and proximate causation (was the harm foreseeable?). The but-for test is more mechanical—focus on whether the defendant's action actually changed the outcome, regardless of foreseeability or fault apportionment.

Question 15

An elderly woman with a history of fainting spells fell and broke her hip while shopping in a grocery store. She sued the store, alleging that she slipped on a grape that the store's employees had negligently failed to clean up. At her deposition, the woman testified, "I felt dizzy and my vision started to go black, just like during my other fainting spells. The next thing I knew, I was on the floor." She did not testify that she felt her foot slip on anything.

The grocery store has moved for summary judgment. What is the store's best argument that its alleged negligence was not the actual cause of the woman's injury? Select one.

The woman's fainting spell was a superseding cause that broke the chain of causation.
The store had no duty to protect customers from the effects of their own preexisting medical conditions.
The woman assumed the risk by shopping alone despite her known history of fainting.
The evidence indicates the woman would have fallen due to her fainting spell even if there had been no grape on the floor. (correct answer)

Explanation: The correct answer is D. The plaintiff has the burden to prove that but for the defendant's negligence (the grape), she would not have been injured. Her own testimony strongly suggests that she fell because she was fainting, not because she slipped. If she was already falling due to a medical episode, the presence of the grape would be irrelevant. Thus, the store's best argument is that its alleged breach was not a but-for cause of the fall and subsequent injury.

Question 16

You are representing a client who was a passenger in a taxi that was struck by another vehicle. The taxi driver had negligently failed to maintain the taxi's brakes, which were operating at only 50% efficiency. The other vehicle ran a red light at high speed and collided with the taxi in the middle of an intersection. Your accident reconstruction expert concludes that the collision was so sudden and severe that even with perfectly functioning brakes, the taxi driver could not have taken any action to avoid the impact or lessen its severity.

Your client wishes to sue the taxi driver for negligence. Regarding the element of actual cause, what is the biggest challenge to your client's claim? Select one.

The taxi driver's faulty brakes were not a but-for cause of your client's injuries. (correct answer)
The other vehicle's action of running a red light was an unforeseeable, superseding cause.
As a passenger, your client assumed the risk of traveling in a commercial vehicle.
The taxi driver's conduct was not a substantial factor in bringing about the harm.

Explanation: The correct answer is A. The core issue is but-for causation. The expert's conclusion is that the accident and resulting injuries would have occurred even if the taxi's brakes had been in perfect condition. This means that the driver's breach of duty (failing to maintain the brakes) was not a but-for cause of the passenger's injuries. While the other driver's actions were also a cause, the question focuses on the claim against the taxi driver, and the lack of actual causation is the fatal flaw in that specific claim.

Question 17

A farmer used a pesticide manufactured by a chemical company. The company had negligently formulated the pesticide, making it less effective than advertised. The farmer's crops suffered a 30% reduction in yield due to an insect infestation. The farmer sued the chemical company for his lost profits. At trial, an agricultural expert testified that even if the pesticide had been formulated correctly, it would only have been 50% effective against this particular type of insect, and the farmer would still have lost at least 25% of his crop yield.

Regarding the farmer's claim for the entire 30% reduction in yield, which statement about actual causation is most accurate? Select one.

The defective pesticide was the actual cause of the entire 30% loss because it failed to perform as advertised.
The defective pesticide was not an actual cause of any loss because the insect infestation was an act of nature.
The defective pesticide was the actual cause of a 5% loss in yield, but not the entire 30% loss. (correct answer)
The defective pesticide was not an actual cause of the loss because the farmer assumed the risk of insect infestation.

Explanation: The correct answer is C. The but-for test is used to determine the extent of the harm caused by the defendant's negligence. Here, even with a non-defective product, the farmer would have suffered a 25% loss. The company's negligence is therefore not the but-for cause of that portion of the loss. However, the farmer's loss was 30%. The difference between the actual loss (30%) and the loss that would have occurred anyway (25%) is 5%. But for the defective pesticide, this additional 5% loss would not have occurred. Thus, the negligence was the actual cause of only that portion of the damages.

Question 18

A hiker was deep in a remote mountain range when he suffered a severe leg injury. He activated his emergency beacon. A private rescue company received the signal and dispatched a helicopter. Due to negligent maintenance, the helicopter experienced engine trouble and had to turn back. A second helicopter was dispatched two hours later and successfully rescued the hiker. Medical experts agree that the hiker's leg injury was so severe that it required amputation. They also agree that the two-hour delay caused by the first helicopter's failure prevented surgeons from saving the leg, reducing his chance of avoiding amputation from 25% to 0%.

The hiker sued the rescue company for the loss of his leg. In a jurisdiction that recognizes the loss-of-chance doctrine, what is the hiker's strongest argument regarding actual causation? Select one.

But for the company's negligence, the hiker would have kept his leg.
The company's negligence was the actual cause of the loss of a 25% chance of saving the leg. (correct answer)
The company's negligence was a substantial factor in the hiker's eventual amputation.
The company, as a rescuer, had a heightened duty of care that makes causation easier to prove.

Explanation: The correct answer is B. Traditional but-for causation is difficult here because the hiker was more likely than not (75% chance) to lose his leg anyway. The loss-of-chance doctrine addresses this by redefining the injury not as the ultimate outcome (the amputation) but as the reduction in the chance of a better outcome. But for the company's negligence, the hiker would not have lost the 25% chance of saving his leg. Therefore, the negligence is the actual cause of that specific harm.

Question 19

The swimmer's estate sues only one of the boat drivers. Which of the following statements correctly applies the but-for test to the defendant driver's conduct? Select one.

The defendant's conduct was not a but-for cause because the other driver's wake was also necessary for the harm to occur.
The defendant's conduct was a but-for cause because without it, the swimmer would not have drowned. (correct answer)
The but-for test is inconclusive, and the court must apply the substantial factor test to determine causation.
The defendant's conduct was not a but-for cause because his wake alone was insufficient to cause the drowning.

Question 20

The security company moves for summary judgment on the issue of causation. How is the court most likely to rule? Select one.

Grant the motion, because the guard's negligence was not a but-for cause of the theft. (correct answer)
Deny the motion, because leaving a gate unlocked is a clear breach of the security company's duty.
Grant the motion, because the thieves' criminal actions were a superseding cause of the loss.
Deny the motion, because the guard's negligence increased the overall risk of a break-in at the facility.