{"id":"bls-free","timeLimitSec":300,"questions":[{"id":"blsf-001","section":"adult","q":"At what rate should you give chest compressions to an adult in cardiac arrest?","options":["120 to 140 per minute","80 to 100 per minute","100 to 120 per minute","At least 60 per minute, never faster"],"answer":2,"explain":"The 2025 AHA adult BLS guidelines keep a compression rate of 100 to 120 per minute. Slower or faster rates move less blood."},{"id":"blsf-002","section":"adult","q":"How deep should chest compressions be for an average adult?","options":["At least 3 inches (7.5 cm)","About one-quarter of the chest's depth","About 1 inch (2.5 cm)","At least 2 inches (5 cm)"],"answer":3,"explain":"Compress an average adult chest at least 2 inches (5 cm), while avoiding excessive depth of more than about 2.4 inches (6 cm)."},{"id":"blsf-003","section":"airway","q":"Under the 2025 AHA guidelines, how do you help a responsive adult with severe choking who cannot cough or speak?","options":["Abdominal thrusts only until it clears","5 back blows, then 5 abdominal thrusts","Chest compressions while still standing","A finger sweep, then 2 breaths"],"answer":1,"explain":"The 2025 guidelines added back blows for adults: repeated cycles of 5 back blows followed by 5 abdominal thrusts until the object comes out or the person becomes unresponsive."},{"id":"blsf-004","section":"peds","q":"How deep should you compress an infant's chest during CPR?","options":["At least one-third of chest depth, about 1.5 in (4 cm)","Only as deep as two fingers can easily push","About 2.5 inches (6 cm), like an adult","About one-tenth of chest depth, about 0.5 in"],"answer":0,"explain":"Compress infants at least one-third of the front-to-back depth of the chest, about 1.5 inches (4 cm)."},{"id":"blsf-005","section":"team","q":"How often should rescuers switch who does chest compressions?","options":["About every 2 minutes","About every 10 minutes","About every 30 seconds","Only when the AED arrives"],"answer":0,"explain":"Compressor fatigue lowers compression quality. Switch about every 2 minutes, or sooner if tired, and keep the switch fast."}]}