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

A) Biphasic

B) Isoelectric

C) Negative

D) Positive

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2) The PR interval is:

A) 100 milliseconds

B) 200 milliseconds

C) 120 milliseconds

D) 160 milliseconds

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3) The QRS duration is:

A) 120 milliseconds

B) 80 milliseconds

C) 100 milliseconds

D) 160 milliseconds

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4) aVF is a combination of which leads?

A) II and III

B) I and II

C) I and III

D) aVL and aVR

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5) A normal QT interval is considered to be:

A) Less than 300 milliseconds

B) More than 500 milliseconds

C) Between 300 and 400 milliseconds

D) Less than 440 to 460 milliseconds

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6) 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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7) Define Einthoven’s equation.

A) I – III = II

B) I + II = III

C) I + III = II

D) II + III = I

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

A) Medial and lateral

B) Right and left

C) Superior and inferior

D) Anterior and posterior

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

A) Conductivity

B) Excitability

C) Refractoriness

D) Automaticity

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11) Which component of the EKG represents ventricular depolarization?

A) P wave

B) T wave

C) QRS complex

D) PR interval

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

A) Positive

B) Isoelectrical

C) Biphasic

D) Negative

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13) The sinus node is located in the:

A) High right atrium

B) Left ventricle

C) Interventricular septum

D) Low right atrium

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

A) 120–160 bpm

B) 100–140 bpm

C) 40–60 bpm

D) 60–100 bpm

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

A) Septal fibers

B) Endocardial fibers

C) Purkinje fibers

D) Myocardial fibers

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16) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 120 to 200 milliseconds

C) 80 to 120 milliseconds

D) 40 to 60 milliseconds

17 / 30

17) A normal PR interval is:

A) 60 to 100 milliseconds

B) 120 to 200 milliseconds

C) 200 to 280 milliseconds

D) 80 to 120 milliseconds

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

A) Normal sinus rhythm

B) Bradycardia

C) Ectopic rhythm

D) Tachycardia

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

A) Beginning of the T wave

B) End of the QRS complex

C) Apex of the T wave

D) Onset of the ST segment

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21) 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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22) 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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23) Which limb leads are bipolar?

A) aVR, aVL, and aVF

B) I and II

C) II and III

D) I, II, and III

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24) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) First-degree heart block

C) Ventricular arrhythmias

D) Atrial fibrillation

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

A) Lead I

B) aVF

C) Lead III

D) Lead II

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

A) Negative

B) Positive

C) Isoelectrical

D) Biphasic

27 / 30

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

A) Negative

B) Bipolar

C) Neutral

D) Positive

28 / 30

28) 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) Unchanged

D) Negative

29 / 30

29) Which limb leads are unipolar?

A) I and aVF

B) II and aVL

C) I, II, and III

D) aVR, aVL, and aVF

30 / 30

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

A) V3

B) V2

C) V1

D) V4

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