Basic Life Support (BLS) Certification Exam Version 1– CPR
and Emergency Cardiovascular Care Updated and Latest
Questions and Correct Answers with Rationale
1. What is the recommended depth for chest compressions on an adult victim?
A. At least 1 inch
B. Exactly 1.5 inches
C. At least 3 inches
D. At least 2 inches but not more than 2.4 inches
Ans: D
Rationale: Effective chest compressions are essential for circulating blood to vital organs during cardiac
arrest. The American Heart Association guidelines specify a depth of at least 2 inches for adults. Rescuers
must be careful not to exceed 2.4 inches to minimize the risk of internal injury. This depth ensures the
heart is sufficiently squeezed between the sternum and the spine. Consistent depth helps maintain a
steady flow of oxygenated blood to the brain. Proper recoil should also be allowed between compressions
for the heart to refill. This balance is critical for the overall success of basic life support efforts.
2. What is the correct compression rate for all victims of cardiac arrest?
A. 100 to 120 compressions per minute
B. 80 to 100 compressions per minute
C. 60 to 80 compressions per minute
D. 140 to 160 compressions per minute
Ans: A
,Rationale: Maintaining the correct pace is vital for the effectiveness of CPR in any emergency situation.
Current medical standards recommend a compression rate of 100 to 120 beats per minute. This specific
speed is proven to maximize cardiac output and improve patient outcomes. Compressing too slowly will
not provide enough circulation to sustain the patient’s brain health. Conversely, compressing too quickly
may prevent the heart from refilling with blood properly. Rescuers often use songs with a matching
tempo to stay within this critical range. High-quality CPR depends heavily on staying within these
established rate parameters.
3. What is the ratio of compressions to breaths for a single rescuer performing adult CPR?
A. 15:2
B. 30:2
C. 5:1
D. 30:1
Ans: B
Rationale: When performing single-rescuer CPR on an adult, the standard cycle is 30 compressions
followed by 2 breaths. This ratio is designed to provide a balance between circulatory support and
oxygenation. Interruptions in compressions should be kept to a minimum to ensure consistent blood
pressure. Providing two breaths allows for necessary gas exchange without causing excessive delay in
pumping. This cycle should be repeated until an AED is ready or professional help arrives. It is important
for rescuers to count out loud to maintain the correct rhythm. Consistent application of the 30:2 ratio is a
fundamental skill in basic life support.
,4. What is the first step when using an Automated External Defibrillator (AED)?
A. Attach the pads to the victim’s bare chest
B. Press the shock button
C. Clear the victim for analysis
D. Turn on the AED
Ans: D
Rationale: The very first action a rescuer must take when an AED arrives is to power the device on. Most
modern AEDs provide voice prompts that guide the user through the remaining steps. Turning the device
on ensures that the system is ready to analyze the patient’s heart rhythm. Once active, the machine will
instruct you on how to apply the electrode pads. Following the device’s verbal instructions helps reduce
stress and prevents errors during the rescue. Many units automatically turn on when the lid is opened to
save time. Immediate activation of the AED is crucial for early defibrillation and survival.
5. Before beginning CPR, what should you check first when you arrive at an emergency
scene?
A. Check if the scene is safe
B. Check the victim’s pulse
C. Check the victim’s breathing
D. Call for an ambulance
Ans: A
, Rationale: Scene safety is the highest priority for any rescuer entering an emergency situation. You must
ensure that you will not become a victim yourself while attempting to help others. Hazards such as traffic,
fire, electricity, or unstable structures must be evaluated immediately. If the scene is unsafe, you should
stay back and wait for professional emergency responders. Helping someone is impossible if the rescuer
is incapacitated by an environmental danger. Only after the scene is determined to be safe should you
proceed to check the victim. This protocol is a foundational rule in all emergency response training
courses.
6. Where should you check for a pulse on an unresponsive adult victim?
A. Brachial artery
B. Carotid artery
C. Radial artery
D. Femoral artery
Ans: B
Rationale: In an adult emergency, the carotid artery in the neck is the most reliable site for a pulse check.
This artery is close to the heart and is usually easy to locate even in low-blood-pressure states. To find it,
place two fingers in the groove between the windpipe and the neck muscles. You should spend no more
than 10 seconds checking for a pulse before starting CPR. If you are unsure whether a pulse is present,
you should assume it is absent. Delaying compressions to search for a faint pulse can be detrimental to
the victim. The carotid pulse check is a standard procedure taught in BLS certification.
and Emergency Cardiovascular Care Updated and Latest
Questions and Correct Answers with Rationale
1. What is the recommended depth for chest compressions on an adult victim?
A. At least 1 inch
B. Exactly 1.5 inches
C. At least 3 inches
D. At least 2 inches but not more than 2.4 inches
Ans: D
Rationale: Effective chest compressions are essential for circulating blood to vital organs during cardiac
arrest. The American Heart Association guidelines specify a depth of at least 2 inches for adults. Rescuers
must be careful not to exceed 2.4 inches to minimize the risk of internal injury. This depth ensures the
heart is sufficiently squeezed between the sternum and the spine. Consistent depth helps maintain a
steady flow of oxygenated blood to the brain. Proper recoil should also be allowed between compressions
for the heart to refill. This balance is critical for the overall success of basic life support efforts.
2. What is the correct compression rate for all victims of cardiac arrest?
A. 100 to 120 compressions per minute
B. 80 to 100 compressions per minute
C. 60 to 80 compressions per minute
D. 140 to 160 compressions per minute
Ans: A
,Rationale: Maintaining the correct pace is vital for the effectiveness of CPR in any emergency situation.
Current medical standards recommend a compression rate of 100 to 120 beats per minute. This specific
speed is proven to maximize cardiac output and improve patient outcomes. Compressing too slowly will
not provide enough circulation to sustain the patient’s brain health. Conversely, compressing too quickly
may prevent the heart from refilling with blood properly. Rescuers often use songs with a matching
tempo to stay within this critical range. High-quality CPR depends heavily on staying within these
established rate parameters.
3. What is the ratio of compressions to breaths for a single rescuer performing adult CPR?
A. 15:2
B. 30:2
C. 5:1
D. 30:1
Ans: B
Rationale: When performing single-rescuer CPR on an adult, the standard cycle is 30 compressions
followed by 2 breaths. This ratio is designed to provide a balance between circulatory support and
oxygenation. Interruptions in compressions should be kept to a minimum to ensure consistent blood
pressure. Providing two breaths allows for necessary gas exchange without causing excessive delay in
pumping. This cycle should be repeated until an AED is ready or professional help arrives. It is important
for rescuers to count out loud to maintain the correct rhythm. Consistent application of the 30:2 ratio is a
fundamental skill in basic life support.
,4. What is the first step when using an Automated External Defibrillator (AED)?
A. Attach the pads to the victim’s bare chest
B. Press the shock button
C. Clear the victim for analysis
D. Turn on the AED
Ans: D
Rationale: The very first action a rescuer must take when an AED arrives is to power the device on. Most
modern AEDs provide voice prompts that guide the user through the remaining steps. Turning the device
on ensures that the system is ready to analyze the patient’s heart rhythm. Once active, the machine will
instruct you on how to apply the electrode pads. Following the device’s verbal instructions helps reduce
stress and prevents errors during the rescue. Many units automatically turn on when the lid is opened to
save time. Immediate activation of the AED is crucial for early defibrillation and survival.
5. Before beginning CPR, what should you check first when you arrive at an emergency
scene?
A. Check if the scene is safe
B. Check the victim’s pulse
C. Check the victim’s breathing
D. Call for an ambulance
Ans: A
, Rationale: Scene safety is the highest priority for any rescuer entering an emergency situation. You must
ensure that you will not become a victim yourself while attempting to help others. Hazards such as traffic,
fire, electricity, or unstable structures must be evaluated immediately. If the scene is unsafe, you should
stay back and wait for professional emergency responders. Helping someone is impossible if the rescuer
is incapacitated by an environmental danger. Only after the scene is determined to be safe should you
proceed to check the victim. This protocol is a foundational rule in all emergency response training
courses.
6. Where should you check for a pulse on an unresponsive adult victim?
A. Brachial artery
B. Carotid artery
C. Radial artery
D. Femoral artery
Ans: B
Rationale: In an adult emergency, the carotid artery in the neck is the most reliable site for a pulse check.
This artery is close to the heart and is usually easy to locate even in low-blood-pressure states. To find it,
place two fingers in the groove between the windpipe and the neck muscles. You should spend no more
than 10 seconds checking for a pulse before starting CPR. If you are unsure whether a pulse is present,
you should assume it is absent. Delaying compressions to search for a faint pulse can be detrimental to
the victim. The carotid pulse check is a standard procedure taught in BLS certification.
