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
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
31. What is the correct action when you notice the chest does not rise during rescue breathing?
A. Push harder on the chest
B. Reposition the head and try again
C. Start chest compressions
D. Increase the volume of breaths
✅ Answer: B. Reposition the head and try again
32. During CPR, when should rescuers switch compressors to prevent fatigue?
A. Every minute
B. Every 5 minutes
C. About every 2 minutes or 5 cycles
D. After each AED shock
✅ Answer: C. About every 2 minutes or 5 cycles
33. What is the correct ventilation rate for an infant or child with a pulse but no breathing (respiratory arrest)?
A. 1 breath every 10 seconds
B. 1 breath every 6 seconds
C. 1 breath every 3–5 seconds
D. 2 breaths every 30 seconds
✅ Answer: C. 1 breath every 3–5 seconds
34. What is the correct hand placement for chest compressions in a child?
A. Just below the nipple line with two fingers
B. One hand or two hands on the lower half of the sternum
C. Mid-abdomen
D. Upper chest
✅ Answer: B. One hand or two hands on the lower half of the sternum
35. Which pulse is checked in an infant during BLS?
A. Radial
B. Carotid
C. Brachial
D. Femoral
✅ Answer: C. Brachial
36. Which of the following describes “agonal gasps”?
A. Normal breathing
B. Shallow but effective breaths
C. Gasping, irregular breaths that are not normal
D. Snoring-type breathing that clears with head tilt
✅ Answer: C. Gasping, irregular breaths that are not normal
37. What is the ideal chest compression fraction during high-quality CPR?
A. 40%
B. 50%
C. 60%
D. At least 80%
✅ Answer: D. At least 80%
38. What is the maximum time to check for a pulse during BLS?
A. 5 seconds
B. 10 seconds
C. 15 seconds
D. 20 seconds
✅ Answer: B. 10 seconds
39. What is the primary purpose of defibrillation?
A. Restart the heart
B. Stop the heart from beating
C. Deliver oxygen
D. Eliminate abnormal rhythm (like VF)
✅ Answer: D. Eliminate abnormal rhythm (like VF)
40. What is the best indicator of effective rescue breathing in a child?
A. Chest rise and fall
B. Color change to pink
C. Improved pulse
D. Audible breath sounds
✅ Answer: A. Chest rise and fall
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