BLS (Basic Life Support) multiple choice questions (MCQs) with answers, (SET 5)
81. A choking infant becomes unresponsive. What should you do first?
A. Deliver back slaps and chest thrusts
B. Attempt blind finger sweep
C. Start CPR, beginning with chest compressions
D. Give 5 abdominal thrusts
✅ Answer: C. Start CPR, beginning with chest compressions
82. When should rescuers perform mouth-to-mouth ventilation instead of bag-mask ventilation?
A. In hospital with multiple rescuers
B. In out-of-hospital settings without equipment
C. When the airway is obstructed
D. During pediatric advanced life support
✅ Answer: B. In out-of-hospital settings without equipment
83. If a victim is breathing normally but unresponsive, what is the best next action?
A. Begin CPR
B. Place in the recovery position and monitor
C. Call for help and leave them alone
D. Administer oxygen
✅ Answer: B. Place in the recovery position and monitor
84. How should you modify AED use for a patient lying in water?
A. Use immediately
B. Dry chest before applying pads
C. Apply pads to wet chest
D. Wait until paramedics arrive
✅ Answer: B. Dry chest before applying pads
85. Which pulse is typically checked in a child (1 year to puberty)?
A. Radial
B. Carotid or femoral
C. Brachial only
D. Apical
✅ Answer: B. Carotid or femoral
86. What should be avoided during rescue breathing in all age groups?
A. Bag-mask ventilation
B. Giving breaths too slowly
C. Over-ventilation
D. Oxygen supplementation
✅ Answer: C. Over-ventilation
87. What is the best way to deliver rescue breaths with a bag-mask device for a child?
A. One-person technique
B. With the mask tilted slightly off
C. Two-rescuer technique with one sealing mask and one squeezing bag
D. Without opening airway
✅ Answer: C. Two-rescuer technique with one sealing mask and one squeezing bag
88. If a victim is not breathing and has no pulse, but the AED is not available, what should you do?
A. Wait for AED
B. Begin CPR immediately
C. Give oxygen
D. Deliver back slaps
✅ Answer: B. Begin CPR immediately
89. What is the compression depth for an adult during CPR?
A. About 1 inch
B. About 1.5 inches
C. At least 2 inches (5 cm)
D. Less than 2 inches
✅ Answer: C. At least 2 inches (5 cm)
90. Why is full chest recoil important during compressions?
A. It prevents rib fractures
B. It allows blood to refill the heart
C. It increases respiratory effort
D. It reduces pain
✅ Answer: B. It allows blood to refill the heart
91. What is the recommended rescue breathing rate for a child or infant with a pulse?
A. 1 breath every 2 seconds
B. 1 breath every 6–8 seconds
C. 1 breath every 3–5 seconds
D. 1 breath every 10 seconds
✅ Answer: C. 1 breath every 3–5 seconds
92. What is the appropriate way to provide chest compressions to an obese adult?
A. Use only one hand
B. Compress over the lower ribs
C. Perform compressions on the center of the chest with both hands
D. Avoid compressions due to risk
✅ Answer: C. Perform compressions on the center of the chest with both hands
93. What is the proper location to check the pulse in an unconscious infant?
A. Radial
B. Carotid
C. Brachial
D. Femoral
✅ Answer: C. Brachial
94. When should an untrained layperson begin chest compressions?
A. After checking pulse for 10 seconds
B. Immediately after confirming unresponsiveness and no normal breathing
C. Only when AED is ready
D. After rescue breaths
✅ Answer: B. Immediately after confirming unresponsiveness and no normal breathing
95. Why is minimizing interruptions in compressions important?
A. It allows for oxygenation
B. It maintains perfusion pressure
C. It gives the rescuer time to rest
D. It prevents air leaks
✅ Answer: B. It maintains perfusion pressure
96. What is the most appropriate technique to open the airway of a trauma victim with possible neck injury?
A. Head tilt–chin lift
B. Jaw-thrust maneuver
C. Abdominal thrust
D. Neck extension
✅ Answer: B. Jaw-thrust maneuver
97. What is a sign of ROSC (Return of Spontaneous Circulation)?
A. Continued gasping
B. Weak peripheral pulses
C. Sudden rise in EtCO₂ (end-tidal CO₂)
D. Muscle twitching
✅ Answer: C. Sudden rise in EtCO₂ (end-tidal CO₂)
98. What is the maximum time you should spend checking for breathing and a pulse?
A. 5 seconds
B. 10 seconds
C. 15 seconds
D. 20 seconds
✅ Answer: B. 10 seconds
99. What is the appropriate compression technique for a single rescuer providing infant CPR?
A. Two-thumb encircling hands technique
B. One hand in center of chest
C. Two fingers just below nipple line
D. Two fists at midline
✅ Answer: C. Two fingers just below nipple line
100. When performing adult CPR, where should your shoulders be in relation to your hands?
A. Off to the side
B. Directly over the hands
C. Behind the hands
D. At chest level
✅ Answer: B. Directly over the hands
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