EKG Multiple Choice Practice Test Questions Answers 2026

Last Updated on March 18, 2026

EKG Multiple Choice Practice Test Questions Answers 2026 EKG (electrocardiogram) multiple choice questions and answers typically refer to questions that test a person’s knowledge of EKG interpretation, cardiac anatomy, and electrophysiology. It will help you in nursing, EKG Technician, EKG certification exam, and ACLS course prep.

These questions may cover topics such as identifying the different waves and intervals on an EKG tracing, diagnosing various arrhythmias, and understanding the clinical significance of EKG findings. Multiple-choice questions are a popular format for EKG exams because they allow for quick, efficient testing of a large amount of material. EKG multiple-choice questions and answers may be used in medical education, certification exams, or as a self-study resource for individuals looking to improve their understanding of EKG interpretation.

EKG Multiple Choice Questions Answers

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EKG Multiple Choice Practice Test Questions Answers 2025

1 / 30

1) Which limb leads are unipolar?

A) aVR, aVL, and aVF

B) II and aVL

C) I, II, and III

D) I and aVF

2 / 30

2) As depolarization spreads away from a positive pole, there is a ________ deflection in that lead.

A) Biphasic

B) Negative

C) Positive

D) Isoelectrical

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3) QTc prolongation can predispose a patient to:

A) Ventricular arrhythmias

B) Atrial fibrillation

C) First-degree heart block

D) Sinus tachycardia

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4) A U wave is more likely to be observed during:

A) Tachycardia

B) Bradycardia

C) Normal sinus rhythm

D) Ectopic rhythm

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5) The sinus node is located in the:

A) Interventricular septum

B) Low right atrium

C) High right atrium

D) Left ventricle

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6) aVF is a combination of which leads?

A) I and III

B) II and III

C) aVL and aVR

D) I and II

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7) Which interval on the EKG represents the entirety of ventricular depolarization and repolarization?

A) PR interval

B) ST segment

C) QT interval

D) QRS complex

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8) A normal QT interval is considered to be:

A) Less than 440 to 460 milliseconds

B) More than 500 milliseconds

C) Between 300 and 400 milliseconds

D) Less than 300 milliseconds

9 / 30

9) The left bundle branch is divided into which two fascicles?

A) Superior and inferior

B) Anterior and posterior

C) Medial and lateral

D) Right and left

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10) The point marking the end of the QRS complex and the beginning of the ST segment is called the:

A) S inflection

B) J point

C) T point

D) R junction

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11) aVR is a combination of which leads?

A) I and II

B) I and III

C) aVL and aVF

D) II and III

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12) All cardiac cells at rest possess a ______ charge.

A) Bipolar

B) Negative

C) Positive

D) Neutral

13 / 30

13) If the electrical impulse spreads away from an area of the heart, the corresponding lead will record the impulse as:

A) Positive

B) Biphasic

C) Negative

D) Unchanged

14 / 30

14) Define Einthoven’s equation.

A) I + II = III

B) I – III = II

C) II + III = I

D) I + III = II

15 / 30

15) A normal PR interval is:

A) 200 to 280 milliseconds

B) 120 to 200 milliseconds

C) 60 to 100 milliseconds

D) 80 to 120 milliseconds

16 / 30

16) The ability of cardiac cells to generate a pacemaker impulse is termed:

A) Automaticity

B) Refractoriness

C) Conductivity

D) Excitability

17 / 30

17) Which part of the EKG marks the end of the absolute refractory period?

A) Beginning of the T wave

B) Apex of the T wave

C) End of the QRS complex

D) Onset of the ST segment

18 / 30

18) Which limb leads are bipolar?

A) aVR, aVL, and aVF

B) II and III

C) I, II, and III

D) I and II

19 / 30

19) The QRS duration is:

A) 120 milliseconds

B) 160 milliseconds

C) 100 milliseconds

D) 80 milliseconds

20 / 30

20) Which component of the EKG represents ventricular depolarization?

A) T wave

B) QRS complex

C) P wave

D) PR interval

21 / 30

21) aVL is a combination of which leads?

A) II and III

B) I and II

C) aVR and aVF

D) I and III

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22) A normal QRS duration is:

A) 120 to 200 milliseconds

B) 40 to 60 milliseconds

C) 200 to 240 milliseconds

D) 80 to 120 milliseconds

23 / 30

23) If the electrical impulse spreads toward an area of the heart, the corresponding lead will record the impulse as:

A) Negative

B) Positive

C) Isoelectric

D) Biphasic

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24) The bundle branches consist of rapidly conducting fibers known as:

A) Purkinje fibers

B) Endocardial fibers

C) Myocardial fibers

D) Septal fibers

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25) Which lead represents the sum of the electromotive forces of the heart?

A) aVF

B) Lead III

C) Lead II

D) Lead I

26 / 30

26) Which structure is known as the “gatekeeper” for electrical impulses through the heart?

A) Atrioventricular node

B) Bundle of His

C) Purkinje fibers

D) Sinoatrial node

27 / 30

27) As depolarization spreads toward a positive pole, there is a ________ deflection in that lead.

A) Positive

B) Biphasic

C) Isoelectrical

D) Negative

28 / 30

28) Normal sinus node activity is typically between ______ and ______ beats per minute.

A) 60–100 bpm

B) 40–60 bpm

C) 120–160 bpm

D) 100–140 bpm

29 / 30

29) The PR interval is:

A) 120 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 200 milliseconds

30 / 30

30) The R wave should be distinctly larger than the S wave by which precordial lead?

A) V2

B) V4

C) V1

D) V3

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