Basic Life Support (BLS)
Exam 2025 Questions and
Answers with Rationales
American Heart Association (AHA) Latest Update 2025
1. What is the correct compression-to-ventilation ratio for 1-rescuer adult CPR?
A. 15:2
B. 30:2
C. 5:1
D. 20:2
Rationale: The recommended ratio for adult CPR when only one rescuer is
present is 30 compressions to 2 breaths, according to AHA guidelines.
2. What is the correct depth of chest compressions for an adult?
A. At least 1 inch
B. At least 2 inches (5 cm)
C. About 3 inches
D. As deep as possible
Rationale: Adult chest compressions should be at least 2 inches (5 cm) deep to be
effective, but not more than 2.4 inches.
,3. For high-quality CPR, chest recoil is important because it:
A. Reduces oxygen demand
B. Allows the heart to refill with blood between compressions
C. Prevents rib fractures
D. Keeps the airway open
Rationale: Full chest recoil is essential as it allows the heart to refill with blood,
maximizing cardiac output.
4. You witness a collapse. The person is unresponsive and not breathing
normally. What is the first step?
A. Begin chest compressions
B. Give 2 rescue breaths
C. Activate emergency response system and get an AED
D. Check for a pulse for 30 seconds
Rationale: According to the BLS sequence, activate EMS and get an AED before
beginning CPR unless you're alone with a child/infant.
5. What is the recommended compression rate per minute during CPR?
A. 80–100
B. 100–110
C. 100–120
D. 120–140
, Rationale: The correct rate for high-quality chest compressions is 100–120
compressions per minute.
6. How often should you switch roles when performing 2-rescuer CPR to avoid
fatigue?
A. Every 10 minutes
B. Every 2 minutes
C. After 50 compressions
D. Only when tired
Rationale: Rescuers should switch roles every 2 minutes to maintain the quality of
compressions.
7. What is the correct compression-to-ventilation ratio in 2-rescuer CPR for an
infant?
A. 30:2
B. 10:2
C. 15:2
D. 20:2
Rationale: In 2-rescuer infant CPR, the correct ratio is 15:2 to provide better
ventilation.
8. When using an AED on a child under 8 years old, what should you use if
available?
Exam 2025 Questions and
Answers with Rationales
American Heart Association (AHA) Latest Update 2025
1. What is the correct compression-to-ventilation ratio for 1-rescuer adult CPR?
A. 15:2
B. 30:2
C. 5:1
D. 20:2
Rationale: The recommended ratio for adult CPR when only one rescuer is
present is 30 compressions to 2 breaths, according to AHA guidelines.
2. What is the correct depth of chest compressions for an adult?
A. At least 1 inch
B. At least 2 inches (5 cm)
C. About 3 inches
D. As deep as possible
Rationale: Adult chest compressions should be at least 2 inches (5 cm) deep to be
effective, but not more than 2.4 inches.
,3. For high-quality CPR, chest recoil is important because it:
A. Reduces oxygen demand
B. Allows the heart to refill with blood between compressions
C. Prevents rib fractures
D. Keeps the airway open
Rationale: Full chest recoil is essential as it allows the heart to refill with blood,
maximizing cardiac output.
4. You witness a collapse. The person is unresponsive and not breathing
normally. What is the first step?
A. Begin chest compressions
B. Give 2 rescue breaths
C. Activate emergency response system and get an AED
D. Check for a pulse for 30 seconds
Rationale: According to the BLS sequence, activate EMS and get an AED before
beginning CPR unless you're alone with a child/infant.
5. What is the recommended compression rate per minute during CPR?
A. 80–100
B. 100–110
C. 100–120
D. 120–140
, Rationale: The correct rate for high-quality chest compressions is 100–120
compressions per minute.
6. How often should you switch roles when performing 2-rescuer CPR to avoid
fatigue?
A. Every 10 minutes
B. Every 2 minutes
C. After 50 compressions
D. Only when tired
Rationale: Rescuers should switch roles every 2 minutes to maintain the quality of
compressions.
7. What is the correct compression-to-ventilation ratio in 2-rescuer CPR for an
infant?
A. 30:2
B. 10:2
C. 15:2
D. 20:2
Rationale: In 2-rescuer infant CPR, the correct ratio is 15:2 to provide better
ventilation.
8. When using an AED on a child under 8 years old, what should you use if
available?
