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 limb leads are unipolar?

A) aVR, aVL, and aVF

B) I and aVF

C) II and aVL

D) I, II, and III

2 / 30

2) aVR is a combination of which leads?

A) I and II

B) aVL and aVF

C) I and III

D) II and III

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

A) V2

B) V3

C) V1

D) V4

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4) The sinus node is located in the:

A) Interventricular septum

B) Low right atrium

C) High right atrium

D) Left ventricle

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

A) Normal sinus rhythm

B) Ectopic rhythm

C) Bradycardia

D) Tachycardia

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6) Define Einthoven’s equation.

A) I + II = III

B) I + III = II

C) I – III = II

D) II + III = I

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

A) S inflection

B) R junction

C) T point

D) J point

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9) 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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10) 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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11) If the electrical impulse spreads toward an area of the heart, the corresponding lead will record the impulse as:

A) Negative

B) Positive

C) Isoelectric

D) Biphasic

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12) aVF is a combination of which leads?

A) aVL and aVR

B) II and III

C) I and II

D) I and III

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

A) Endocardial fibers

B) Myocardial fibers

C) Purkinje fibers

D) Septal fibers

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

A) Purkinje fibers

B) Bundle of His

C) Sinoatrial node

D) Atrioventricular node

15 / 30

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

A) aVF

B) Lead II

C) Lead I

D) Lead III

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

A) Negative

B) Biphasic

C) Positive

D) Isoelectrical

17 / 30

17) The QRS duration is:

A) 80 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 120 milliseconds

18 / 30

18) Which component of the EKG represents ventricular depolarization?

A) PR interval

B) QRS complex

C) T wave

D) P wave

19 / 30

19) Which limb leads are bipolar?

A) aVR, aVL, and aVF

B) I, II, and III

C) I and II

D) II and III

20 / 30

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

A) Apex of the T wave

B) End of the QRS complex

C) Beginning of the T wave

D) Onset of the ST segment

21 / 30

21) The PR interval is:

A) 120 milliseconds

B) 160 milliseconds

C) 200 milliseconds

D) 100 milliseconds

22 / 30

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

A) Neutral

B) Bipolar

C) Negative

D) Positive

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23) A normal QRS duration is:

A) 80 to 120 milliseconds

B) 200 to 240 milliseconds

C) 120 to 200 milliseconds

D) 40 to 60 milliseconds

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24) 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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25) aVL is a combination of which leads?

A) I and II

B) I and III

C) II and III

D) aVR and aVF

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26) 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

27 / 30

27) A normal PR interval is:

A) 120 to 200 milliseconds

B) 80 to 120 milliseconds

C) 60 to 100 milliseconds

D) 200 to 280 milliseconds

28 / 30

28) QTc prolongation can predispose a patient to:

A) First-degree heart block

B) Atrial fibrillation

C) Ventricular arrhythmias

D) Sinus tachycardia

29 / 30

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

A) Excitability

B) Conductivity

C) Refractoriness

D) Automaticity

30 / 30

30) 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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