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) The sinus node is located in the:

A) Interventricular septum

B) Low right atrium

C) Left ventricle

D) High right atrium

2 / 30

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

A) Medial and lateral

B) Superior and inferior

C) Anterior and posterior

D) Right and left

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3) The PR interval is:

A) 120 milliseconds

B) 160 milliseconds

C) 100 milliseconds

D) 200 milliseconds

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

A) Isoelectrical

B) Biphasic

C) Negative

D) Positive

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

A) aVF

B) Lead III

C) Lead I

D) Lead II

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6) A normal PR interval is:

A) 200 to 280 milliseconds

B) 60 to 100 milliseconds

C) 80 to 120 milliseconds

D) 120 to 200 milliseconds

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

A) Positive

B) Bipolar

C) Negative

D) Neutral

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

A) Tachycardia

B) Ectopic rhythm

C) Bradycardia

D) Normal sinus rhythm

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9) The QRS duration is:

A) 80 milliseconds

B) 160 milliseconds

C) 120 milliseconds

D) 100 milliseconds

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10) aVF is a combination of which leads?

A) I and II

B) aVL and aVR

C) I and III

D) II and III

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

A) End of the QRS complex

B) Beginning of the T wave

C) Apex of the T wave

D) Onset of the ST segment

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

A) Myocardial fibers

B) Septal fibers

C) Purkinje fibers

D) Endocardial fibers

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

A) Automaticity

B) Excitability

C) Conductivity

D) Refractoriness

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14) A normal QT interval is considered to be:

A) More than 500 milliseconds

B) Between 300 and 400 milliseconds

C) Less than 440 to 460 milliseconds

D) Less than 300 milliseconds

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

A) Unchanged

B) Positive

C) Biphasic

D) Negative

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17) Which limb leads are unipolar?

A) I, II, and III

B) II and aVL

C) aVR, aVL, and aVF

D) I and aVF

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

A) PR interval

B) ST segment

C) QRS complex

D) QT interval

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

A) 40–60 bpm

B) 120–160 bpm

C) 100–140 bpm

D) 60–100 bpm

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20) 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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21) A normal QRS duration is:

A) 40 to 60 milliseconds

B) 120 to 200 milliseconds

C) 80 to 120 milliseconds

D) 200 to 240 milliseconds

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

A) Negative

B) Isoelectric

C) Biphasic

D) Positive

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

A) Bundle of His

B) Atrioventricular node

C) Sinoatrial node

D) Purkinje fibers

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24) 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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25) 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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26) aVR is a combination of which leads?

A) I and III

B) I and II

C) II and III

D) aVL and aVF

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27) aVL is a combination of which leads?

A) I and II

B) I and III

C) aVR and aVF

D) II and III

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28) Define Einthoven’s equation.

A) I – III = II

B) II + III = I

C) I + II = III

D) I + III = II

29 / 30

29) Which limb leads are bipolar?

A) I, II, and III

B) II and III

C) I and II

D) aVR, aVL, and aVF

30 / 30

30) Which component of the EKG represents ventricular depolarization?

A) T wave

B) QRS complex

C) PR interval

D) P wave

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