BLS (Basic Life Support) multiple choice questions (MCQs) with answers
21. What is the first step in using an AED?
A. Attach the pads
B. Plug in the AED
C. Power on the AED
D. Begin chest compressions
✅ Answer: C. Power on the AED
22. If you witness a child suddenly collapse and they are unresponsive, what should you do first?
A. Start CPR for 2 minutes
B. Activate EMS and get an AED
C. Give rescue breaths
D. Perform back blows
✅ Answer: B. Activate EMS and get an AED
23. Which of the following is a sign of effective CPR?
A. Chest rises during compressions
B. The AED says “No shock advised”
C. The victim begins to breathe normally
D. The chest rises with each compression
✅ Answer: C. The victim begins to breathe normally
24. What is the correct compression technique for an infant with 2 rescuers?
A. One thumb on chest
B. Two fingers on chest
C. Two-thumb encircling hands technique
D. Palm of one hand
✅ Answer: C. Two-thumb encircling hands technique
25. What is the compression-to-ventilation ratio for 2-rescuer CPR in infants?
A. 30:2
B. 5:1
C. 15:2
D. 3:1
✅ Answer: C. 15:2
26. What is the best location to check a pulse in an unresponsive adult?
A. Radial artery
B. Carotid artery
C. Brachial artery
D. Femoral artery
✅ Answer: B. Carotid artery
27. When should you switch roles during 2-rescuer CPR?
A. After 5 minutes
B. After each shock
C. Every 2 minutes (or 5 cycles of 30:2)
D. Only when tired
✅ Answer: C. Every 2 minutes (or 5 cycles of 30:2)
28. Which of the following victims requires CPR?
A. Breathing and responsive
B. Unresponsive and breathing normally
C. Unresponsive and not breathing or only gasping
D. Unresponsive but with a strong pulse
✅ Answer: C. Unresponsive and not breathing or only gasping
29. You are a lone provider. You find a child in arrest that was unwitnessed. What should you do?
A. Call EMS and then start CPR
B. Start CPR for about 2 minutes, then activate EMS and get AED
C. Use AED first
D. Wait for a second rescuer
✅ Answer: B. Start CPR for about 2 minutes, then activate EMS and get AED
30. When performing CPR, how can you minimize interruptions in chest compressions?
A. By stopping after each cycle
B. By waiting for AED to fully analyze before continuing
C. By switching compressors every 30 seconds
D. By preparing AED use and rescue breaths during compressions
✅ Answer: D. By preparing AED use and rescue breaths during compressions
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