Basic Life Support (BLS) Provider Examination
DEFINED ANSWERS LATEST ALREADY GRADED
A+ (2025/2026)
1. What is the correct compression-to-ventilation ratio for single-rescuer adult
CPR?
A. 15:2
B. 30:2
C. 20:2
D. Continuous compressions without ventilations
**Correct Answer: B**
**Rationale:** For single-rescuer adult CPR, the recommended ratio is 30
compressions to 2 ventilations. This applies to both lay rescuers and healthcare
providers until an advanced airway is in place.
2. A 55-year-old man collapses in front of you. He is unresponsive, not breathing
normally, and has no pulse. You are alone. What is the first action you should
take?
A. Start CPR immediately
B. Call 911 and get an AED
C. Open the airway and give two rescue breaths
D. Perform a finger sweep of the mouth
**Correct Answer: B**
,**Rationale:** For an unresponsive adult in cardiac arrest, the lone rescuer
should first activate the emergency response system and retrieve an AED before
starting CPR, as the most common cause of adult cardiac arrest is cardiac in origin
and early defibrillation is critical.
3. What is the recommended depth of chest compressions for an adult?
A. At least 1.5 inches (4 cm)
B. At least 2 inches (5 cm) but no more than 2.4 inches (6 cm)
C. Exactly 1 inch (2.5 cm)
D. As deep as possible
**Correct Answer: B**
**Rationale:** High-quality CPR requires compressions of at least 2 inches (5 cm)
but not exceeding 2.4 inches (6 cm) in adults to generate adequate blood flow
while avoiding injury.
4. Which of the following best describes the correct hand placement for adult
chest compressions?
A. Over the left side of the chest
B. On the upper half of the sternum
C. On the lower half of the sternum, between the nipples
D. Over the xiphoid process
**Correct Answer: C**
**Rationale:** Correct hand placement is the lower half of the sternum at the
nipple line. Avoid compressing the xiphoid process or ribs to reduce risk of injury.
,5. What is the recommended rate of chest compressions for all age groups?
A. 60–80 per minute
B. 80–100 per minute
C. 100–120 per minute
D. At least 120 per minute
**Correct Answer: C**
**Rationale:** The optimal compression rate for all ages is 100 to 120
compressions per minute. Compressions faster than 120/min may not allow full
chest recoil, decreasing cardiac output.
6. During 2-rescuer CPR on an adult, when should the rescuers switch compressor
roles?
A. After every cycle of 30 compressions
B. About every 2 minutes or when the AED analyzes
C. Only if the compressor is tired
D. After every 5 cycles, if not tired
**Correct Answer: B**
**Rationale:** To prevent fatigue and maintain high-quality compressions,
rescuers should switch compressor roles approximately every 2 minutes (every 5
cycles of 30:2) or when the AED is analyzing the rhythm.
7. An AED is brought to a patient in cardiac arrest. After the pads are applied,
what is the next step?
, A. Immediately deliver a shock
B. Stop CPR and wait for the AED to analyze the rhythm
C. Continue CPR while the AED analyzes
D. Give two rescue breaths and then analyze
**Correct Answer: B**
**Rationale:** When the AED is attached, all rescuers must stand clear and not
touch the patient while the AED analyzes the heart rhythm to ensure accurate
analysis.
8. What is the correct compression-to-ventilation ratio for 2-rescuer CPR on an
infant?
A. 30:2
B. 15:2
C. 5:1
D. 10:1
**Correct Answer: B**
**Rationale:** For infants and children, the 2-rescuer CPR ratio is 15
compressions to 2 ventilations. For single rescuer, it remains 30:2 for all ages.
9. When performing bag-mask ventilation on an adult, what technique helps
achieve an effective seal?
A. One-hand E-C clamp
B. Two-person bag-mask ventilation
C. Pressing the mask tightly with two fingers
DEFINED ANSWERS LATEST ALREADY GRADED
A+ (2025/2026)
1. What is the correct compression-to-ventilation ratio for single-rescuer adult
CPR?
A. 15:2
B. 30:2
C. 20:2
D. Continuous compressions without ventilations
**Correct Answer: B**
**Rationale:** For single-rescuer adult CPR, the recommended ratio is 30
compressions to 2 ventilations. This applies to both lay rescuers and healthcare
providers until an advanced airway is in place.
2. A 55-year-old man collapses in front of you. He is unresponsive, not breathing
normally, and has no pulse. You are alone. What is the first action you should
take?
A. Start CPR immediately
B. Call 911 and get an AED
C. Open the airway and give two rescue breaths
D. Perform a finger sweep of the mouth
**Correct Answer: B**
,**Rationale:** For an unresponsive adult in cardiac arrest, the lone rescuer
should first activate the emergency response system and retrieve an AED before
starting CPR, as the most common cause of adult cardiac arrest is cardiac in origin
and early defibrillation is critical.
3. What is the recommended depth of chest compressions for an adult?
A. At least 1.5 inches (4 cm)
B. At least 2 inches (5 cm) but no more than 2.4 inches (6 cm)
C. Exactly 1 inch (2.5 cm)
D. As deep as possible
**Correct Answer: B**
**Rationale:** High-quality CPR requires compressions of at least 2 inches (5 cm)
but not exceeding 2.4 inches (6 cm) in adults to generate adequate blood flow
while avoiding injury.
4. Which of the following best describes the correct hand placement for adult
chest compressions?
A. Over the left side of the chest
B. On the upper half of the sternum
C. On the lower half of the sternum, between the nipples
D. Over the xiphoid process
**Correct Answer: C**
**Rationale:** Correct hand placement is the lower half of the sternum at the
nipple line. Avoid compressing the xiphoid process or ribs to reduce risk of injury.
,5. What is the recommended rate of chest compressions for all age groups?
A. 60–80 per minute
B. 80–100 per minute
C. 100–120 per minute
D. At least 120 per minute
**Correct Answer: C**
**Rationale:** The optimal compression rate for all ages is 100 to 120
compressions per minute. Compressions faster than 120/min may not allow full
chest recoil, decreasing cardiac output.
6. During 2-rescuer CPR on an adult, when should the rescuers switch compressor
roles?
A. After every cycle of 30 compressions
B. About every 2 minutes or when the AED analyzes
C. Only if the compressor is tired
D. After every 5 cycles, if not tired
**Correct Answer: B**
**Rationale:** To prevent fatigue and maintain high-quality compressions,
rescuers should switch compressor roles approximately every 2 minutes (every 5
cycles of 30:2) or when the AED is analyzing the rhythm.
7. An AED is brought to a patient in cardiac arrest. After the pads are applied,
what is the next step?
, A. Immediately deliver a shock
B. Stop CPR and wait for the AED to analyze the rhythm
C. Continue CPR while the AED analyzes
D. Give two rescue breaths and then analyze
**Correct Answer: B**
**Rationale:** When the AED is attached, all rescuers must stand clear and not
touch the patient while the AED analyzes the heart rhythm to ensure accurate
analysis.
8. What is the correct compression-to-ventilation ratio for 2-rescuer CPR on an
infant?
A. 30:2
B. 15:2
C. 5:1
D. 10:1
**Correct Answer: B**
**Rationale:** For infants and children, the 2-rescuer CPR ratio is 15
compressions to 2 ventilations. For single rescuer, it remains 30:2 for all ages.
9. When performing bag-mask ventilation on an adult, what technique helps
achieve an effective seal?
A. One-hand E-C clamp
B. Two-person bag-mask ventilation
C. Pressing the mask tightly with two fingers
