EKG Multiple Choice Practice Test Questions Answers 2026

Last Updated on June 30, 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

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

A) Positive

B) Negative

C) Neutral

D) Bipolar

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2) Define Einthoven’s equation.

A) II + III = I

B) I + II = III

C) I + III = II

D) I – III = II

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

A) Biphasic

B) Positive

C) Negative

D) Isoelectric

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

A) Right and left

B) Anterior and posterior

C) Superior and inferior

D) Medial and lateral

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5) Which limb leads are unipolar?

A) II and aVL

B) I, II, and III

C) aVR, aVL, and aVF

D) I and aVF

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

A) Bundle of His

B) Purkinje fibers

C) Atrioventricular node

D) Sinoatrial node

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

A) Negative

B) Isoelectrical

C) Biphasic

D) Positive

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8) aVR is a combination of which leads?

A) aVL and aVF

B) II and III

C) I and II

D) I and III

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

A) J point

B) S inflection

C) T point

D) R junction

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

A) PR interval

B) QT interval

C) ST segment

D) QRS complex

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

A) V1

B) V4

C) V3

D) V2

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

A) Positive

B) Negative

C) Biphasic

D) Unchanged

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13) aVL is a combination of which leads?

A) I and III

B) aVR and aVF

C) I and II

D) II and III

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14) A normal PR interval is:

A) 60 to 100 milliseconds

B) 120 to 200 milliseconds

C) 80 to 120 milliseconds

D) 200 to 280 milliseconds

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

A) Positive

B) Biphasic

C) Negative

D) Isoelectrical

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16) A normal QT interval is considered to be:

A) Less than 440 to 460 milliseconds

B) Less than 300 milliseconds

C) Between 300 and 400 milliseconds

D) More than 500 milliseconds

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

A) Onset of the ST segment

B) Apex of the T wave

C) Beginning of the T wave

D) End of the QRS complex

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

A) Bradycardia

B) Normal sinus rhythm

C) Ectopic rhythm

D) Tachycardia

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

A) Lead III

B) Lead II

C) aVF

D) Lead I

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

A) Conductivity

B) Refractoriness

C) Excitability

D) Automaticity

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21) The sinus node is located in the:

A) Left ventricle

B) Interventricular septum

C) High right atrium

D) Low right atrium

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

A) Septal fibers

B) Purkinje fibers

C) Myocardial fibers

D) Endocardial fibers

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23) A normal QRS duration is:

A) 80 to 120 milliseconds

B) 200 to 240 milliseconds

C) 40 to 60 milliseconds

D) 120 to 200 milliseconds

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24) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) Ventricular arrhythmias

C) First-degree heart block

D) Atrial fibrillation

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25) The PR interval is:

A) 120 milliseconds

B) 200 milliseconds

C) 160 milliseconds

D) 100 milliseconds

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26) The QRS duration is:

A) 160 milliseconds

B) 100 milliseconds

C) 120 milliseconds

D) 80 milliseconds

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

A) 40–60 bpm

B) 60–100 bpm

C) 100–140 bpm

D) 120–160 bpm

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28) Which limb leads are bipolar?

A) I and II

B) I, II, and III

C) II and III

D) aVR, aVL, and aVF

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29) aVF is a combination of which leads?

A) aVL and aVR

B) I and III

C) II and III

D) I and II

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30) Which component of the EKG represents ventricular depolarization?

A) T wave

B) QRS complex

C) P wave

D) PR interval

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