OFAI Logical Reasoning and Deductive Thinking 1 — Questions and Answers
Question 1: All firefighters at Station 7 are certified in First Aid. Marcus is certified in First Aid. Which of the following conclusions is valid?
- Marcus is definitely a firefighter at Station 7
- Marcus may or may not be a firefighter at Station 7 (Correct answer)
- Marcus cannot be a firefighter at Station 7
- All people certified in First Aid work at Station 7
Correct answer: Marcus may or may not be a firefighter at Station 7
The fact that all firefighters at Station 7 have First Aid certification does not mean everyone with First Aid certification is a Station 7 firefighter — Marcus could be certified for other reasons.
Question 2: A fire crew responds only if both Truck A and Truck B are available. Truck A is unavailable today. What can be concluded?
- The crew will respond if Truck B is available
- The crew will not respond today (Correct answer)
- The crew may still respond if Truck B is available
- Truck B's availability is irrelevant today
Correct answer: The crew will not respond today
Since the crew requires BOTH trucks and Truck A is unavailable, the crew cannot respond regardless of Truck B's status.
Question 3: If a building has more than 4 floors, it requires a sprinkler system. A building has 6 floors. Which conclusion must be true?
- The building does not need a sprinkler system
- The building requires a sprinkler system (Correct answer)
- Only buildings over 10 floors need sprinklers
- The sprinkler system may or may not be required
Correct answer: The building requires a sprinkler system
The building has 6 floors, which is more than 4, so the rule directly applies and a sprinkler system is required.
Question 4: Five firefighters — A, B, C, D, and E — are ranked 1st through 5th. A ranks higher than C. D ranks lower than B but higher than E. C ranks higher than D. Who ranks last?
- C
- D
- B
- E (Correct answer)
Correct answer: E
From the clues: A > C > D > E, and B > D, placing E at the bottom of the ranking chain.
Question 5: All hazardous materials calls require Protective Equipment Level A. Firefighter Chen is responding to a hazmat call. What must be true?
- Chen does not need Level A equipment
- Chen must use Level A equipment (Correct answer)
- Chen may choose a lower protection level
- Level A equipment is optional on hazmat calls
Correct answer: Chen must use Level A equipment
The rule states ALL hazmat calls require Level A — no exceptions — so Chen must use Level A equipment.
Question 6: Dispatch sends Engine 1 or Ladder 2 to every structure fire, but never both. Engine 1 was sent to the Pine Street fire. What can be concluded about Ladder 2?
- Ladder 2 was also sent to Pine Street
- Ladder 2 was not sent to Pine Street (Correct answer)
- Ladder 2 may or may not have been sent
- The rule does not apply to structure fires
Correct answer: Ladder 2 was not sent to Pine Street
The rule specifies 'never both,' so since Engine 1 was sent, Ladder 2 was definitively not sent to Pine Street.
Question 7: Some rescue technicians are also paramedics. All paramedics complete 500+ clinical hours. Firefighter Rivera is a rescue technician but not a paramedic. Which must be true?
- Rivera completed 500+ clinical hours
- Rivera did not complete 500+ clinical hours
- Rivera may or may not have completed 500+ hours (Correct answer)
- All rescue technicians complete 500+ hours
Correct answer: Rivera may or may not have completed 500+ hours
The 500-hour rule applies only to paramedics; since Rivera is a rescue technician but NOT a paramedic, we cannot determine her clinical hours from the given information.
OFAI Logical Reasoning and Deductive Thinking 1
All firefighters at Station 7 are certified in First Aid.
Marcus is certified in First Aid.
Which of the following conclusions is valid?