Certified EKG Technician (CET) Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. The primary purpose of an electrocardiogram (EKG) is to assess
A. Lung expansion
B. Electrical activity of the heart
C. Blood pressure regulation
D. Oxygen saturation
Answer: B
An EKG records the electrical impulses generated by the heart to
evaluate rhythm and conduction.
2. Which node normally acts as the heart’s primary pacemaker?
A. AV node
B. Bundle of His
C. Purkinje fibers
D. SA node
Answer: D
The sinoatrial (SA) node initiates electrical impulses under normal
conditions.
3. A standard resting EKG uses how many leads?
A. 3
B. 6
C. 10
, D. 12
Answer: D
A standard diagnostic EKG is a 12-lead tracing.
4. Lead II records electrical activity between which electrodes?
A. Right arm and left arm
B. Right arm and left leg
C. Left arm and left leg
D. Chest and left leg
Answer: B
Lead II measures the voltage between the right arm and lef t leg.
5. Which waveform represents atrial depolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
Answer: A
The P wave reflects atrial depolarization.
6. The QRS complex represents
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial contraction
Answer: B
The QRS complex corresponds to ventricular depolarization.
7. The normal PR interval range is approximately
A. 0.04–0.08 seconds
B. 0.10–0.20 seconds
, C. 0.20–0.30 seconds
D. 0.30–0.40 seconds
Answer: B
The PR interval normally measures 0.12–0.20 seconds.
8. Which paper speed is standard for most EKG recordings?
A. 10 mm/sec
B. 20 mm/sec
C. 25 mm/sec
D. 50 mm/sec
Answer: C
Standard EKG paper speed is 25 mm per second.
9. Sinus rhythm requires all of the following EXCEPT
A. Regular rhythm
B. P wave before each QRS
C. Heart rate 60–100 bpm
D. Wide QRS complexes
Answer: D
Wide QRS complexes are not a requirement for sinus rhythm.
10. A heart rate greater than 100 bpm is termed
A. Bradycardia
B. Tachycardia
C. Asystole
D. Flutter
Answer: B
Tachycardia refers to a heart rate over 100 bpm.
11. Which chest lead is placed at the fourth intercostal space,
right sternal border?
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. The primary purpose of an electrocardiogram (EKG) is to assess
A. Lung expansion
B. Electrical activity of the heart
C. Blood pressure regulation
D. Oxygen saturation
Answer: B
An EKG records the electrical impulses generated by the heart to
evaluate rhythm and conduction.
2. Which node normally acts as the heart’s primary pacemaker?
A. AV node
B. Bundle of His
C. Purkinje fibers
D. SA node
Answer: D
The sinoatrial (SA) node initiates electrical impulses under normal
conditions.
3. A standard resting EKG uses how many leads?
A. 3
B. 6
C. 10
, D. 12
Answer: D
A standard diagnostic EKG is a 12-lead tracing.
4. Lead II records electrical activity between which electrodes?
A. Right arm and left arm
B. Right arm and left leg
C. Left arm and left leg
D. Chest and left leg
Answer: B
Lead II measures the voltage between the right arm and lef t leg.
5. Which waveform represents atrial depolarization?
A. P wave
B. QRS complex
C. T wave
D. U wave
Answer: A
The P wave reflects atrial depolarization.
6. The QRS complex represents
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial contraction
Answer: B
The QRS complex corresponds to ventricular depolarization.
7. The normal PR interval range is approximately
A. 0.04–0.08 seconds
B. 0.10–0.20 seconds
, C. 0.20–0.30 seconds
D. 0.30–0.40 seconds
Answer: B
The PR interval normally measures 0.12–0.20 seconds.
8. Which paper speed is standard for most EKG recordings?
A. 10 mm/sec
B. 20 mm/sec
C. 25 mm/sec
D. 50 mm/sec
Answer: C
Standard EKG paper speed is 25 mm per second.
9. Sinus rhythm requires all of the following EXCEPT
A. Regular rhythm
B. P wave before each QRS
C. Heart rate 60–100 bpm
D. Wide QRS complexes
Answer: D
Wide QRS complexes are not a requirement for sinus rhythm.
10. A heart rate greater than 100 bpm is termed
A. Bradycardia
B. Tachycardia
C. Asystole
D. Flutter
Answer: B
Tachycardia refers to a heart rate over 100 bpm.
11. Which chest lead is placed at the fourth intercostal space,
right sternal border?
