BLS (Basic Life Support) multiple choice questions (MCQs) with answers:
BLS MCQs – Set 1
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
✅ Answer: B. 30:2
2. What is the preferred method for opening the airway of an unresponsive victim with no suspected spinal injury?
A. Jaw thrust
B. Head tilt–chin lift
C. Finger sweep
D. Abdominal thrust
✅ Answer: B. Head tilt–chin lift
3. What is the first step you should take when you see someone collapse?
A. Begin chest compressions
B. Call for help
C. Check for responsiveness
D. Give 2 rescue breaths
✅ Answer: C. Check for responsiveness
4. What is the recommended rate for chest compressions in adults?
A. 60–80/min
B. 80–100/min
C. 100–120/min
D. 120–140/min
✅ Answer: C. 100–120/min
5. For a child, what is the depth of chest compressions recommended during CPR?
A. At least 1 inch
B. About 1.5 inches
C. At least 2 inches
D. About 2 inches (5 cm)
✅ Answer: D. About 2 inches (5 cm)
6. How often should breaths be given during rescue breathing (for an adult with a pulse but no breathing)?
A. Every 3–5 seconds
B. Every 6 seconds (10 breaths/min)
C. Every 8 seconds
D. Every 10 seconds
✅ Answer: B. Every 6 seconds (10 breaths/min)
7. If an AED advises a shock, what should you do next?
A. Start chest compressions
B. Check the pulse
C. Deliver the shock and resume CPR immediately
D. Wait for a second rhythm analysis
✅ Answer: C. Deliver the shock and resume CPR immediately
8. What is the appropriate action after the AED delivers a shock?
A. Wait for further instructions
B. Start CPR immediately
C. Give rescue breaths
D. Check pulse for 10 seconds
✅ Answer: B. Start CPR immediately
9. What is the compression-to-ventilation ratio for 2-rescuer child CPR?
A. 30:2
B. 15:2
C. 5:1
D. 20:2
✅ Answer: B. 15:2
10. You are alone and find an unresponsive infant. What should you do first?
A. Call 911 immediately
B. Give back slaps
C. Perform CPR for 2 minutes, then call emergency services
D. Look for a defibrillator
✅ Answer: C. Perform CPR for 2 minutes, then call emergency services
11. When giving high-quality CPR to an adult, what action should you ensure is being accomplished?
A. Giving breaths as fast as possible
B. Compressing at a depth of at least 1 inch
C. Compressing at least 2 inches and allowing full chest recoil
D. Delivering compressions at a rate of 80/min
✅ Answer: C. Compressing at least 2 inches and allowing full chest recoil
12. What is the best way to relieve severe choking in a responsive adult?
A. Start CPR
B. Perform abdominal thrusts (Heimlich maneuver)
C. Give back slaps
D. Deliver rescue breaths
✅ Answer: B. Perform abdominal thrusts (Heimlich maneuver)
13. What should you do if a choking victim becomes unresponsive?
A. Continue abdominal thrusts
B. Leave them and get help
C. Start CPR, beginning with chest compressions
D. Give two quick rescue breaths
✅ Answer: C. Start CPR, beginning with chest compressions
14. What is the most important factor in increasing survival for cardiac arrest?
A. Early advanced airway
B. Early defibrillation
C. High-flow oxygen
D. Transport to hospital
✅ Answer: B. Early defibrillation
15. How can you tell if your rescue breaths for an infant are effective?
A. Chest visibly rises with each breath
B. The infant cries
C. Air comes out of the mouth
D. The color of the face changes
✅ Answer: A. Chest visibly rises with each breath
16. For adults, how many hands are typically used for chest compressions during CPR?
A. One hand
B. Two fingers
C. Two hands
D. One finger
✅ Answer: C. Two hands
17. What is the correct hand placement for chest compressions in an adult?
A. Upper chest
B. Center of the chest, on the sternum
C. Over the ribs
D. Below the ribcage
✅ Answer: B. Center of the chest, on the sternum
18. For a child victim, how deep should compressions be?
A. About 1 inch
B. At least one-third the depth of the chest (about 2 inches)
C. 2.5 inches
D. 1.5 inches
✅ Answer: B. At least one-third the depth of the chest (about 2 inches)
19. What is the compression rate per minute in high-quality CPR for any age?
A. 80–100/min
B. 90–110/min
C. 100–120/min
D. 120–140/min
✅ Answer: C. 100–120/min
20. When using an AED on an infant or small child, what should you do if pediatric pads are not available?
A. Do not use AED
B. Use adult pads, one on the chest and one on the back
C. Cut adult pads to fit
D. Use both adult pads on the chest
✅ Answer: B. Use adult pads, one on the chest and one on the back
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