EKG Multiple Choice Practice Test Questions Answers 2026

Last Updated on June 30, 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

0%

7

EKG Multiple Choice Practice Test Questions Answers 2025

1 / 30

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

A) Negative

B) Positive

C) Bipolar

D) Neutral

2 / 30

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

A) End of the QRS complex

B) Apex of the T wave

C) Beginning of the T wave

D) Onset of the ST segment

3 / 30

3) A normal QT interval is considered to be:

A) Between 300 and 400 milliseconds

B) Less than 440 to 460 milliseconds

C) More than 500 milliseconds

D) Less than 300 milliseconds

4 / 30

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

A) Purkinje fibers

B) Endocardial fibers

C) Septal fibers

D) Myocardial fibers

5 / 30

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

A) Positive

B) Biphasic

C) Negative

D) Isoelectrical

6 / 30

6) QTc prolongation can predispose a patient to:

A) Atrial fibrillation

B) Ventricular arrhythmias

C) First-degree heart block

D) Sinus tachycardia

7 / 30

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

A) 100–140 bpm

B) 40–60 bpm

C) 120–160 bpm

D) 60–100 bpm

8 / 30

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

A) Automaticity

B) Excitability

C) Conductivity

D) Refractoriness

9 / 30

9) 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) Biphasic

D) Positive

10 / 30

10) 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

11 / 30

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

A) Bradycardia

B) Tachycardia

C) Normal sinus rhythm

D) Ectopic rhythm

12 / 30

12) The PR interval is:

A) 100 milliseconds

B) 160 milliseconds

C) 200 milliseconds

D) 120 milliseconds

13 / 30

13) The QRS duration is:

A) 120 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 80 milliseconds

14 / 30

14) A normal QRS duration is:

A) 80 to 120 milliseconds

B) 40 to 60 milliseconds

C) 200 to 240 milliseconds

D) 120 to 200 milliseconds

15 / 30

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

A) ST segment

B) QRS complex

C) PR interval

D) QT interval

16 / 30

16) Which limb leads are unipolar?

A) II and aVL

B) I, II, and III

C) I and aVF

D) aVR, aVL, and aVF

17 / 30

17) A normal PR interval is:

A) 60 to 100 milliseconds

B) 200 to 280 milliseconds

C) 120 to 200 milliseconds

D) 80 to 120 milliseconds

18 / 30

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

A) Biphasic

B) Isoelectric

C) Positive

D) Negative

19 / 30

19) The sinus node is located in the:

A) Interventricular septum

B) Low right atrium

C) Left ventricle

D) High right atrium

20 / 30

20) Define Einthoven’s equation.

A) I + III = II

B) I – III = II

C) II + III = I

D) I + II = III

21 / 30

21) aVR is a combination of which leads?

A) I and II

B) aVL and aVF

C) II and III

D) I and III

22 / 30

22) Which component of the EKG represents ventricular depolarization?

A) T wave

B) QRS complex

C) PR interval

D) P wave

23 / 30

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

A) V1

B) V4

C) V3

D) V2

24 / 30

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

A) Superior and inferior

B) Anterior and posterior

C) Medial and lateral

D) Right and left

25 / 30

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

A) Biphasic

B) Negative

C) Positive

D) Isoelectrical

26 / 30

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

A) Purkinje fibers

B) Atrioventricular node

C) Sinoatrial node

D) Bundle of His

27 / 30

27) aVL is a combination of which leads?

A) I and II

B) aVR and aVF

C) II and III

D) I and III

28 / 30

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

A) Lead II

B) aVF

C) Lead III

D) Lead I

29 / 30

29) aVF is a combination of which leads?

A) II and III

B) I and II

C) aVL and aVR

D) I and III

30 / 30

30) Which limb leads are bipolar?

A) I and II

B) II and III

C) I, II, and III

D) aVR, aVL, and aVF

Your score is

See also: