EKG Technician Certification (NHA CET)
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1. Which part of the heart is responsible for initiating the electrical impulse?
A. AV node
B. Bundle of His
C. SA node
D. Purkinje fibers
explanation: The sinoatrial (SA) node is the natural pacemaker of the heart
and initiates electrical impulses.
2. A normal resting heart rate for an adult is:
A. 40–60 bpm
B. 60–100 bpm
C. 100–140 bpm
D. 120–160 bpm
explanation: The standard normal adult heart rate range is 60 to 100 beats
per minute.
3. What does the P wave represent?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial relaxation
, explanation: The P wave reflects electrical activity as the atria depolarize
before contraction.
4. The QRS complex represents:
A. Atrial depolarization
B. Atrial repolarization
C. Ventricular depolarization
D. Ventricular relaxation
explanation: The QRS complex corresponds to ventricular depolarization
leading to contraction.
5. A patient has a heart rate of 45 bpm. This is classified as:
A. Tachycardia
B. Normal sinus rhythm
C. Bradycardia
D. Fibrillation
explanation: Bradycardia is defined as a heart rate below 60 bpm.
6. What is the purpose of the AV node?
A. Initiate heartbeat
B. Delay electrical impulse
C. Pump blood
D. Oxygenate blood
explanation: The AV node delays the impulse to allow atria to fully contract
before ventricles.
7. Standard EKG paper speed is:
A. 10 mm/sec
B. 15 mm/sec
C. 25 mm/sec
D. 50 mm/sec
explanation: The standard recording speed for EKG paper is 25 mm/sec.
8. One small box on EKG paper equals:
A. 0.02 sec
, B. 0.04 sec
C. 0.06 sec
D. 0.08 sec
explanation: Each small box represents 0.04 seconds in time.
9. Which electrolyte imbalance can cause peaked T waves?
A. Hypokalemia
B. Hyponatremia
C. Hyperkalemia
D. Hypocalcemia
explanation: Elevated potassium levels (hyperkalemia) cause tall, peaked T
waves.
10.Lead placement for V1 is:
A. Left midclavicular line
B. 4th intercostal space right sternal border
C. 5th intercostal space left side
D. Right midaxillary line
explanation: V1 is placed at the 4th intercostal space on the right sternal
border.
11.Which rhythm is irregularly irregular?
A. Sinus rhythm
B. Atrial flutter
C. Atrial fibrillation
D. Ventricular tachycardia
explanation: Atrial fibrillation has no consistent rhythm pattern.
12.A flat line on EKG indicates:
A. Tachycardia
B. Bradycardia
C. Asystole
D. Fibrillation
explanation: Asystole is the absence of electrical activity.
, 13.What does the T wave represent?
A. Atrial contraction
B. Ventricular contraction
C. Ventricular repolarization
D. Atrial depolarization
explanation: The T wave shows recovery (repolarization) of ventricles.
14.Artifact on an EKG is most commonly caused by:
A. Heart disease
B. Medication
C. Patient movement
D. Oxygen levels
explanation: Movement can interfere with electrode signals causing artifact.
15.A heart rate above 100 bpm is:
A. Bradycardia
B. Tachycardia
C. Normal
D. Fibrillation
explanation: Tachycardia is defined as a heart rate over 100 bpm.
16.Which lead views the heart from the left lateral side?
A. V1
B. V2
C. V6
D. aVR
explanation: V6 is positioned to view the lateral wall of the left ventricle.
17.The PR interval measures:
A. Ventricular contraction
B. Time from atrial to ventricular depolarization
C. Ventricular repolarization
D. Heart rate
explanation: It reflects conduction time from SA node through AV node.
Exam Newest 2026-2027 Updated 100
Questions From Actual Exams Complete
Questions And Correct Detailed Answers
(Expert Verified Exam) |Already Graded
A+||Brand New!!
1. Which part of the heart is responsible for initiating the electrical impulse?
A. AV node
B. Bundle of His
C. SA node
D. Purkinje fibers
explanation: The sinoatrial (SA) node is the natural pacemaker of the heart
and initiates electrical impulses.
2. A normal resting heart rate for an adult is:
A. 40–60 bpm
B. 60–100 bpm
C. 100–140 bpm
D. 120–160 bpm
explanation: The standard normal adult heart rate range is 60 to 100 beats
per minute.
3. What does the P wave represent?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial relaxation
, explanation: The P wave reflects electrical activity as the atria depolarize
before contraction.
4. The QRS complex represents:
A. Atrial depolarization
B. Atrial repolarization
C. Ventricular depolarization
D. Ventricular relaxation
explanation: The QRS complex corresponds to ventricular depolarization
leading to contraction.
5. A patient has a heart rate of 45 bpm. This is classified as:
A. Tachycardia
B. Normal sinus rhythm
C. Bradycardia
D. Fibrillation
explanation: Bradycardia is defined as a heart rate below 60 bpm.
6. What is the purpose of the AV node?
A. Initiate heartbeat
B. Delay electrical impulse
C. Pump blood
D. Oxygenate blood
explanation: The AV node delays the impulse to allow atria to fully contract
before ventricles.
7. Standard EKG paper speed is:
A. 10 mm/sec
B. 15 mm/sec
C. 25 mm/sec
D. 50 mm/sec
explanation: The standard recording speed for EKG paper is 25 mm/sec.
8. One small box on EKG paper equals:
A. 0.02 sec
, B. 0.04 sec
C. 0.06 sec
D. 0.08 sec
explanation: Each small box represents 0.04 seconds in time.
9. Which electrolyte imbalance can cause peaked T waves?
A. Hypokalemia
B. Hyponatremia
C. Hyperkalemia
D. Hypocalcemia
explanation: Elevated potassium levels (hyperkalemia) cause tall, peaked T
waves.
10.Lead placement for V1 is:
A. Left midclavicular line
B. 4th intercostal space right sternal border
C. 5th intercostal space left side
D. Right midaxillary line
explanation: V1 is placed at the 4th intercostal space on the right sternal
border.
11.Which rhythm is irregularly irregular?
A. Sinus rhythm
B. Atrial flutter
C. Atrial fibrillation
D. Ventricular tachycardia
explanation: Atrial fibrillation has no consistent rhythm pattern.
12.A flat line on EKG indicates:
A. Tachycardia
B. Bradycardia
C. Asystole
D. Fibrillation
explanation: Asystole is the absence of electrical activity.
, 13.What does the T wave represent?
A. Atrial contraction
B. Ventricular contraction
C. Ventricular repolarization
D. Atrial depolarization
explanation: The T wave shows recovery (repolarization) of ventricles.
14.Artifact on an EKG is most commonly caused by:
A. Heart disease
B. Medication
C. Patient movement
D. Oxygen levels
explanation: Movement can interfere with electrode signals causing artifact.
15.A heart rate above 100 bpm is:
A. Bradycardia
B. Tachycardia
C. Normal
D. Fibrillation
explanation: Tachycardia is defined as a heart rate over 100 bpm.
16.Which lead views the heart from the left lateral side?
A. V1
B. V2
C. V6
D. aVR
explanation: V6 is positioned to view the lateral wall of the left ventricle.
17.The PR interval measures:
A. Ventricular contraction
B. Time from atrial to ventricular depolarization
C. Ventricular repolarization
D. Heart rate
explanation: It reflects conduction time from SA node through AV node.
