EKG Multiple Choice Practice Test Questions Answers 2025

Last Updated on March 28, 2025

EKG Multiple Choice Practice Test Questions Answers 2025: 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, as they allow for quick and 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 structure is known as the “gatekeeper” for electrical impulses through the heart?

A) Purkinje fibers

B) Sinoatrial node

C) Atrioventricular node

D) Bundle of His

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

A) Automaticity

B) Conductivity

C) Refractoriness

D) Excitability

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

A) Apex of the T wave

B) Beginning of the T wave

C) End of the QRS complex

D) Onset of the ST segment

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

A) Negative

B) Isoelectrical

C) Biphasic

D) Positive

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5) aVL is a combination of which leads?

A) I and II

B) aVR and aVF

C) I and III

D) II and III

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

A) Right and left

B) Medial and lateral

C) Superior and inferior

D) Anterior and posterior

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7) A normal QT interval is considered to be:

A) Less than 300 milliseconds

B) Between 300 and 400 milliseconds

C) More than 500 milliseconds

D) Less than 440 to 460 milliseconds

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

A) Negative

B) Biphasic

C) Positive

D) Isoelectrical

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

A) QRS complex

B) PR interval

C) ST segment

D) QT interval

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

A) T point

B) J point

C) R junction

D) S inflection

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

A) 120–160 bpm

B) 60–100 bpm

C) 100–140 bpm

D) 40–60 bpm

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14) Which component of the EKG represents ventricular depolarization?

A) PR interval

B) P wave

C) QRS complex

D) T wave

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

A) Positive

B) Negative

C) Neutral

D) Bipolar

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16) QTc prolongation can predispose a patient to:

A) Atrial fibrillation

B) Sinus tachycardia

C) First-degree heart block

D) Ventricular arrhythmias

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

A) V1

B) V3

C) V2

D) V4

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

A) Isoelectric

B) Biphasic

C) Positive

D) Negative

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

A) Ectopic rhythm

B) Tachycardia

C) Normal sinus rhythm

D) Bradycardia

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20) aVR is a combination of which leads?

A) aVL and aVF

B) I and III

C) II and III

D) I and II

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21) Which limb leads are bipolar?

A) I, II, and III

B) aVR, aVL, and aVF

C) I and II

D) II and III

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22) Which limb leads are unipolar?

A) aVR, aVL, and aVF

B) I and aVF

C) I, II, and III

D) II and aVL

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23) 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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24) The QRS duration is:

A) 100 milliseconds

B) 80 milliseconds

C) 160 milliseconds

D) 120 milliseconds

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25) aVF is a combination of which leads?

A) I and II

B) II and III

C) aVL and aVR

D) I and III

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26) The sinus node is located in the:

A) High right atrium

B) Left ventricle

C) Low right atrium

D) Interventricular septum

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27) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 40 to 60 milliseconds

C) 80 to 120 milliseconds

D) 120 to 200 milliseconds

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28) Define Einthoven’s equation.

A) I – III = II

B) I + II = III

C) II + III = I

D) I + III = II

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29) The PR interval is:

A) 200 milliseconds

B) 120 milliseconds

C) 160 milliseconds

D) 100 milliseconds

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

A) Negative

B) Positive

C) Biphasic

D) Unchanged

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