EKG Technician Certification (CET) Practice Test

EKG Technician Certification (CET) Practice Test

This test is designed to help you assess your knowledge and readiness for the actual certification exam.

It consists of 50 multiple-choice questions covering key topics such as EKG interpretation, cardiac anatomy, physiology, instrumentation, and patient care.

Take your time, read each question carefully, and choose the best answer.

Good luck!

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EKG Technician Certification (CET) Practice Test

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Your answers are highlighted below.
Question 1
What is the primary function of the sinoatrial (SA) node?
A
To regulate blood pressure
B
To act as the heart's natural pacemaker
C
To pump blood to the lungs
D
To filter impurities from the blood
Question 2
Which of the following represents the normal duration of a PR interval?
A
0.12–0.20 seconds
B
0.06–0.10 seconds
C
0.20–0.30 seconds
D
0.30–0.40 seconds
Question 3
What does the QRS complex on an EKG represent?
A
Atrial depolarization
B
Ventricular depolarization
C
Atrial repolarization
D
Ventricular repolarization
Question 4
Which lead is considered a bipolar limb lead?
A
aVR
B
V1
C
Lead II
D
V6
Question 5
What is the normal heart rate for an adult?
A
40–60 bpm
B
60–100 bpm
C
100–120 bpm
D
120–140 bpm
Question 6
Which of the following is a symptom of myocardial infarction?
A
Hypertension
B
Chest pain
C
Bradycardia
D
Hyperventilation
Question 7
What is the purpose of the ground electrode in an EKG setup?
A
To enhance the QRS complex
B
To reduce electrical interference 
C
To measure blood pressure
D
To detect arrhythmias
Question 8
Which of the following is a characteristic of atrial fibrillation?
A
Regular P waves
B
Absent P waves with irregular rhythm
C
Prolonged PR interval
D
Wide QRS complex
Question 9
What is the correct placement for the V1 electrode?
A
4th intercostal space, right sternal border
B
5th intercostal space, midclavicular line
C
4th intercostal space, left sternal border
D
5th intercostal space, anterior axillary line
Question 10
Which condition is indicated by ST-segment elevation?
A
Hypokalemia
B
Myocardial ischemia
C
Hypercalcemia
D
Atrial flutter
Question 11
What is the term for a heart rate greater than 100 bpm?
A
Bradycardia
B
Tachycardia
C
Arrhythmia
D
Asystole
Question 12
Which of the following is a common cause of artifacts in an EKG tracing?
A
Proper electrode placement
B
Patient movement
C
Normal sinus rhythm
D
Correct lead attachment
Question 13
What is the normal axis range for the heart’s electrical activity?
A
-30° to +90°
B
-90° to +180°
C
0° to +180°
D
-180° to +90°
Question 14
Which electrolyte imbalance can cause peaked T waves on an EKG?
A
Hypokalemia
B
Hyperkalemia
C
Hypocalcemia
D
Hypermagnesemia
Question 15
What is the primary purpose of an EKG?
A
To measure blood oxygen levels
B
To assess the electrical activity of the heart
C
To monitor blood pressure
D
To evaluate lung function 
Question 16
Which of the following is a characteristic of ventricular tachycardia?
A
Narrow QRS complex
B
Absent P waves
C
Regular rhythm
D
Rate less than 100 bpm
Question 17
What is the correct order of electrical conduction in the heart?
A
SA node → AV node → Bundle of His → Purkinje fibers
B
AV node → SA node → Purkinje fibers → Bundle of His
C
Bundle of His → Purkinje fibers → SA node → AV node
D
Purkinje fibers → Bundle of His → AV node → SA node
Question 18
Which lead is used to view the inferior wall of the heart?
A
Lead I
B
Lead II
C
Lead aVL
D
Lead V1
Question 19
What is the term for a pause in the heart’s electrical activity?
A
Asystole
B
Fibrillation
C
Heart block
D
Sinus arrest
Question 20
Which of the following is a sign of hypercalcemia on an EKG?
A
Prolonged QT interval
B
Shortened QT interval
C
Peaked T waves
D
ST-segment elevation
Question 21
What is the normal duration of the QRS complex?  
A
0.04–0.10 seconds
B
0.12–0.20 seconds
C
0.20–0.30 seconds
D
0.30–0.40 seconds
Question 22
Which condition is characterized by a “sawtooth” pattern on an EKG?
A
Atrial flutter
B
Ventricular fibrillation
C
Sinus bradycardia
D
First-degree heart block
Question 23
What is the primary cause of sinus bradycardia?
A
Increased sympathetic activity
B
Decreased parasympathetic activity
C
Increased parasympathetic activity
D
Decreased sympathetic activity
Question 24
Which of the following is a symptom of pericarditis?
A
ST segment depression
B
PR segment elevation
C
Diffuse ST segment elevation
D
Inverted T waves
Question 25
What is the term for the absence of electrical activity in the heart?
A
Asystole
B
Fibrillation
C
Tachycardia
D
Bradycardia
Question 26
Which of the following is a characteristic of third-degree heart block?
A
Regular rhythm
B
No relationship between P waves and QRS complexes
C
Short PR interval
D
Narrow QRS complex
Question 27
What is the normal range for the QT interval?
A
0.20–0.30 seconds
B
0.30–0.40 seconds
C
0.40–0.44 seconds
D
0.44–0.50 seconds
Question 28
Which of the following is a sign of hypokalemia on an EKG?
A
Peaked T waves
B
Flattened T waves
C
Shortened QT interval
D
ST-segment elevation
Question 29
What is the term for an irregularly irregular rhythm with no discernible P waves?
A
Atrial fibrillation
B
Ventricular tachycardia
C
Sinus arrhythmia
D
Second-degree heart block
Question 30
Which of the following is a common cause of ventricular fibrillation?
A
Hypoxia
B
Hyperventilation
C
Sinus bradycardia
D
First-degree heart block
Question 31
What is the correct placement for the V4 electrode?
A
5th intercostal space, midclavicular line
B
4th intercostal space, right sternal border
C
5th intercostal space, anterior axillary line
D
4th intercostal space, left sternal border
Question 32
Which of the following is a characteristic of left ventricular hypertrophy?  
A
Small R waves in V5 and V6
B
Deep S waves in V1 and V2
C
Short QT interval
D
Narrow QRS complex
Question 33
What is the term for a heart rate less than 60 bpm?
A
Tachycardia
B
Bradycardia
C
Arrhythmia
D
Asystole
Question 34
Which of the following is a sign of myocardial infarction on an EKG?
A
ST segment depression
B
Pathological Q waves
C
Short PR interval
D
Peaked T waves
Question 35
What is the primary function of the AV node?
A
To generate electrical impulses
B
To delay electrical impulses
C
To pump blood to the lungs
D
To filter impurities from the blood
Question 36
Which of the following is a characteristic of the right bundle branch block?
A
Wide QRS complex in V1 and V2
B
Narrow QRS complex in V5 and V6
C
Short QT interval
D
ST-segment elevation
Question 37
What is the term for a premature contraction originating in the ventricles?
A
Premature atrial contraction (PAC)
B
Premature ventricular contraction (PVC)
C
Sinus pause
D
Atrial flutter 
Question 38
Which of the following is a sign of hyperkalemia on an EKG?
A
Flattened T waves
B
Peaked T waves
C
Shortened QT interval
D
ST segment depression
Question 39
What is the normal duration of the P wave?
A
0.06–0.10 seconds
B
0.12–0.20 seconds
C
0.20–0.30 seconds
D
0.30–0.40 seconds
Question 40
Which of the following is a characteristic of second-degree heart block (Type I)?
A
Progressive lengthening of the PR interval
B
No relationship between P waves and QRS complexes
C
Short PR interval
D
Wide QRS complex 
Question 41
What is the term for a rapid, disorganized rhythm originating in the ventricles?
A
Ventricular fibrillation
B
Atrial fibrillation
C
Sinus tachycardia
D
First-degree heart block
Question 42
Which of the following is a sign of hypocalcemia on an EKG?
A
Shortened QT interval
B
Prolonged QT interval
C
Peaked T waves
D
ST-segment elevation
Question 43
What is the correct placement for the V5 electrode?
A
5th intercostal space, anterior axillary line
B
4th intercostal space, right sternal border
C
5th intercostal space, midclavicular line
D
4th intercostal space, left sternal border
Question 44
Which of the following is a characteristic of Wolff-Parkinson-White syndrome?
A
Short PR interval and delta wave
B
Prolonged PR interval
C
Wide QRS complex
D
ST-segment elevation
Question 45
What is the term for a premature contraction originating in the atria?
A
Premature atrial contraction (PAC)
B
Premature ventricular contraction (PVC)
C
Sinus pause
D
Atrial flutter
Question 46
Which of the following is a sign of myocardial ischemia on an EKG?
A
ST segment elevation
B
ST segment depression
C
Peaked T waves
D
Shortened QT interval 
Question 47
What is the normal range for the corrected QT interval (QTc)?
A
0.30–0.40 seconds
B
0.40–0.44 seconds
C
0.44–0.50 seconds
D
0.50–0.60 seconds
Question 48
Which of the following is a characteristic of pulseless electrical activity (PEA)?
A
Organized electrical activity without a pulse
B
Disorganized electrical activity with a pulse
C
Absent electrical activity
D
Rapid, regular rhythm 
Question 49
What is the term for a rhythm originating from the AV junction?
A
Junctional rhythm
B
Sinus rhythm
C
Ventricular rhythm
D
Atrial rhythm
Question 50
Which of the following is a sign of digitalis toxicity on an EKG?
A
ST segment depression with a “scooped” appearance
B
ST-segment elevation
C
Peaked T waves
D
Shortened QT interval
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