EKG Multiple Choice Practice Test Questions Answers 2026

Last Updated on October 6, 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) A normal QT interval is considered to be:

A) Less than 300 milliseconds

B) Less than 440 to 460 milliseconds

C) Between 300 and 400 milliseconds

D) More than 500 milliseconds

2 / 30

2) Define Einthoven’s equation.

A) II + III = I

B) I + II = III

C) I + III = II

D) I – III = II

3 / 30

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

A) Onset of the ST segment

B) End of the QRS complex

C) Apex of the T wave

D) Beginning of the T wave

4 / 30

4) Which limb leads are bipolar?

A) aVR, aVL, and aVF

B) II and III

C) I, II, and III

D) I and II

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5) aVF is a combination of which leads?

A) II and III

B) I and III

C) I and II

D) aVL and aVR

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6) QTc prolongation can predispose a patient to:

A) Atrial fibrillation

B) Ventricular arrhythmias

C) Sinus tachycardia

D) First-degree heart block

7 / 30

7) 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

8 / 30

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

A) Lead III

B) Lead I

C) Lead II

D) aVF

9 / 30

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

A) Neutral

B) Negative

C) Bipolar

D) Positive

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10) Which component of the EKG represents ventricular depolarization?

A) PR interval

B) T wave

C) QRS complex

D) P wave

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

A) R junction

B) T point

C) J point

D) S inflection

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

A) Excitability

B) Automaticity

C) Refractoriness

D) Conductivity

13 / 30

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

A) V1

B) V3

C) V2

D) V4

14 / 30

14) 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

15 / 30

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

A) Negative

B) Unchanged

C) Positive

D) Biphasic

16 / 30

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

A) QT interval

B) QRS complex

C) PR interval

D) ST segment

17 / 30

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

A) Septal fibers

B) Endocardial fibers

C) Purkinje fibers

D) Myocardial fibers

18 / 30

18) aVL is a combination of which leads?

A) aVR and aVF

B) II and III

C) I and III

D) I and II

19 / 30

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

A) 120–160 bpm

B) 40–60 bpm

C) 60–100 bpm

D) 100–140 bpm

20 / 30

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

A) Isoelectrical

B) Biphasic

C) Positive

D) Negative

21 / 30

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

A) Medial and lateral

B) Right and left

C) Anterior and posterior

D) Superior and inferior

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22) The sinus node is located in the:

A) Left ventricle

B) Low right atrium

C) High right atrium

D) Interventricular septum

23 / 30

23) The PR interval is:

A) 160 milliseconds

B) 200 milliseconds

C) 100 milliseconds

D) 120 milliseconds

24 / 30

24) Which limb leads are unipolar?

A) I, II, and III

B) II and aVL

C) I and aVF

D) aVR, aVL, and aVF

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

A) Bradycardia

B) Tachycardia

C) Ectopic rhythm

D) Normal sinus rhythm

26 / 30

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

A) Positive

B) Biphasic

C) Isoelectrical

D) Negative

27 / 30

27) The QRS duration is:

A) 160 milliseconds

B) 120 milliseconds

C) 80 milliseconds

D) 100 milliseconds

28 / 30

28) aVR is a combination of which leads?

A) I and II

B) II and III

C) I and III

D) aVL and aVF

29 / 30

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

A) Isoelectric

B) Positive

C) Biphasic

D) Negative

30 / 30

30) 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

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