BLS (Basic Life Support) multiple choice questions (MCQs) with answers,
41. What is the most appropriate action for a lone rescuer who finds an unresponsive adult without breathing or a pulse?
A. Give two rescue breaths, then call for help
B. Start CPR beginning with compressions
C. Check for injuries
D. Look for a medical ID
✅ Answer: B. Start CPR beginning with compressions
42. What should you do immediately after delivering a shock with an AED?
A. Wait for further analysis
B. Check the pulse
C. Resume chest compressions immediately
D. Give rescue breaths
✅ Answer: C. Resume chest compressions immediately
43. In adult CPR, how long should each rescue breath be delivered over?
A. 1 second
B. 2 seconds
C. 3 seconds
D. As fast as possible
✅ Answer: A. 1 second
44. Which of the following is a universal step for operating an AED?
A. Look for medical alerts
B. Remove all clothing
C. Apply pads to bare chest and follow prompts
D. Deliver a manual shock
✅ Answer: C. Apply pads to bare chest and follow prompts
45. Which of the following statements about chest recoil is true?
A. Allow full recoil between compressions
B. Recoil is not necessary during rapid compressions
C. Recoil only matters for infants
D. Maintain pressure on the chest for better rhythm
✅ Answer: A. Allow full recoil between compressions
46. What is the minimum number of rescuers needed for effective 2-rescuer CPR?
A. 1
B. 2
C. 3
D. 4
✅ Answer: B. 2
47. What is the purpose of allowing complete chest recoil during CPR?
A. Prevent injury
B. Minimize fatigue
C. Allow the heart to refill with blood
D. Maximize rescue breath efficiency
✅ Answer: C. Allow the heart to refill with blood
48. What should you do if the AED detects no shockable rhythm?
A. Deliver a manual shock
B. Wait for EMS
C. Resume CPR immediately
D. Turn off the AED
✅ Answer: C. Resume CPR immediately
49. What is one advantage of using a barrier device during rescue breathing?
A. Prevents air from escaping
B. Improves compression effectiveness
C. Reduces risk of infection transmission
D. Allows for faster breaths
✅ Answer: C. Reduces risk of infection transmission
50. A child is unresponsive, not breathing, and has a weak pulse of 50/min. What is the correct action?
A. Give rescue breaths only
B. Begin chest compressions
C. Recheck pulse every 5 minutes
D. Give abdominal thrusts
✅ Answer: B. Begin chest compressions
51. What does the “C” in CAB of BLS stand for?
A. Check
B. Chest
C. Compressions
D. Circulation
✅ Answer: C. Compressions
52. What should rescuers do if they suspect a head or neck injury during CPR?
A. Use jaw-thrust without head tilt to open the airway
B. Use head tilt–chin lift as usual
C. Avoid CPR
D. Wait for a cervical collar
✅ Answer: A. Use jaw-thrust without head tilt to open the airway
53. What is the correct compression-to-breaths ratio for a newborn (neonatal resuscitation)?
A. 3:1
B. 5:1
C. 15:2
D. 30:2
✅ Answer: A. 3:1 (Note: specific to neonates)
54. Which of the following is most accurate regarding hands-only CPR?
A. It is recommended only for infants
B. It is equally effective as conventional CPR in adults
C. It includes rescue breaths and compressions
D. It is recommended for untrained bystanders
✅ Answer: D. It is recommended for untrained bystanders
55. When do you start CPR on an infant with a pulse <60/min and signs of poor perfusion?
A. Only if the pulse drops to 40
B. Immediately
C. After 2 minutes of rescue breaths
D. Wait until pulse is gone
✅ Answer: B. Immediately
56. Why is it important to avoid excessive ventilation during CPR?
A. It speeds up the heart rate
B. It causes oxygen toxicity
C. It increases intrathoracic pressure and reduces cardiac output
D. It improves blood pressure
✅ Answer: C. It increases intrathoracic pressure and reduces cardiac output
57. What does the AED do after analyzing the rhythm and finding no shockable rhythm?
A. Prompts the rescuer to stop CPR
B. Tells rescuer to check pulse
C. Advises to continue CPR
D. Automatically restarts
✅ Answer: C. Advises to continue CPR
58. What is a common sign of effective CPR in a hospital setting?
A. Cyanosis
B. ROSC (return of spontaneous circulation)
C. Absent pulse
D. Dry airway
✅ Answer: B. ROSC (return of spontaneous circulation)
59. What is the appropriate step if you notice a victim has a pacemaker where AED pads should be placed?
A. Do not use AED
B. Place the pad directly over the device
C. Place the pad at least 1 inch away from the device
D. Turn off the pacemaker
✅ Answer: C. Place the pad at least 1 inch away from the device
60. Which of the following actions is NOT part of the adult BLS algorithm?
A. Open airway and give rescue breaths
B. Start compressions if no pulse
C. Administer IV medications
D. Attach and use AED as soon as available
✅ Answer: C. Administer IV medications
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