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) aVL is a combination of which leads?

A) II and III

B) aVR and aVF

C) I and III

D) I and II

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

A) J point

B) T point

C) R junction

D) S inflection

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

A) Isoelectrical

B) Positive

C) Biphasic

D) Negative

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4) Which limb leads are bipolar?

A) II and III

B) I and II

C) aVR, aVL, and aVF

D) I, II, and III

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5) QTc prolongation can predispose a patient to:

A) First-degree heart block

B) Sinus tachycardia

C) Atrial fibrillation

D) Ventricular arrhythmias

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

A) Anterior and posterior

B) Superior and inferior

C) Right and left

D) Medial and lateral

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

A) Automaticity

B) Excitability

C) Conductivity

D) Refractoriness

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

A) PR interval

B) QT interval

C) QRS complex

D) ST segment

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

A) Unchanged

B) Biphasic

C) Positive

D) Negative

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10) aVR is a combination of which leads?

A) I and II

B) II and III

C) aVL and aVF

D) I and III

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11) Define Einthoven’s equation.

A) I + II = III

B) I – III = II

C) I + III = II

D) II + III = I

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12) The QRS duration is:

A) 160 milliseconds

B) 120 milliseconds

C) 100 milliseconds

D) 80 milliseconds

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

A) Biphasic

B) Positive

C) Negative

D) Isoelectrical

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

A) End of the QRS complex

B) Apex of the T wave

C) Beginning of the T wave

D) Onset of the ST segment

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

A) Lead II

B) Lead I

C) aVF

D) Lead III

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16) The sinus node is located in the:

A) Low right atrium

B) Interventricular septum

C) Left ventricle

D) High right atrium

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

A) Sinoatrial node

B) Purkinje fibers

C) Bundle of His

D) Atrioventricular node

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18) A normal PR interval is:

A) 200 to 280 milliseconds

B) 120 to 200 milliseconds

C) 80 to 120 milliseconds

D) 60 to 100 milliseconds

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19) Which component of the EKG represents ventricular depolarization?

A) PR interval

B) QRS complex

C) T wave

D) P wave

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20) aVF is a combination of which leads?

A) I and II

B) I and III

C) aVL and aVR

D) II and III

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21) A normal QT interval is considered to be:

A) Less than 440 to 460 milliseconds

B) More than 500 milliseconds

C) Less than 300 milliseconds

D) Between 300 and 400 milliseconds

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22) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 40 to 60 milliseconds

C) 120 to 200 milliseconds

D) 80 to 120 milliseconds

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

A) Neutral

B) Negative

C) Positive

D) Bipolar

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

A) 60–100 bpm

B) 100–140 bpm

C) 120–160 bpm

D) 40–60 bpm

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

A) V1

B) V3

C) V4

D) V2

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26) The PR interval is:

A) 120 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 200 milliseconds

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27) Which limb leads are unipolar?

A) aVR, aVL, and aVF

B) I, II, and III

C) I and aVF

D) II and aVL

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

A) Endocardial fibers

B) Myocardial fibers

C) Septal fibers

D) Purkinje fibers

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

A) Isoelectric

B) Negative

C) Biphasic

D) Positive

30 / 30

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

A) Ectopic rhythm

B) Normal sinus rhythm

C) Bradycardia

D) Tachycardia

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