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 lead represents the sum of the electromotive forces of the heart?

A) Lead III

B) aVF

C) Lead II

D) Lead I

2 / 30

2) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) Ventricular arrhythmias

C) Atrial fibrillation

D) First-degree heart block

3 / 30

3) 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

4 / 30

4) The PR interval is:

A) 100 milliseconds

B) 200 milliseconds

C) 160 milliseconds

D) 120 milliseconds

5 / 30

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

A) 120–160 bpm

B) 40–60 bpm

C) 100–140 bpm

D) 60–100 bpm

6 / 30

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

A) Negative

B) Bipolar

C) Neutral

D) Positive

7 / 30

7) The QRS duration is:

A) 100 milliseconds

B) 80 milliseconds

C) 160 milliseconds

D) 120 milliseconds

8 / 30

8) The sinus node is located in the:

A) High right atrium

B) Left ventricle

C) Low right atrium

D) Interventricular septum

9 / 30

9) 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

10 / 30

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

A) Endocardial fibers

B) Purkinje fibers

C) Septal fibers

D) Myocardial fibers

11 / 30

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

A) Bradycardia

B) Normal sinus rhythm

C) Ectopic rhythm

D) Tachycardia

12 / 30

12) aVR is a combination of which leads?

A) II and III

B) I and III

C) I and II

D) aVL and aVF

13 / 30

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

A) Positive

B) Isoelectrical

C) Negative

D) Biphasic

14 / 30

14) 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

15 / 30

15) aVL is a combination of which leads?

A) aVR and aVF

B) II and III

C) I and II

D) I and III

16 / 30

16) aVF is a combination of which leads?

A) aVL and aVR

B) I and III

C) I and II

D) II and III

17 / 30

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

A) Conductivity

B) Refractoriness

C) Excitability

D) Automaticity

18 / 30

18) Which limb leads are bipolar?

A) I and II

B) I, II, and III

C) aVR, aVL, and aVF

D) II and III

19 / 30

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

A) T point

B) S inflection

C) R junction

D) J point

20 / 30

20) Which limb leads are unipolar?

A) I and aVF

B) I, II, and III

C) aVR, aVL, and aVF

D) II and aVL

21 / 30

21) Define Einthoven’s equation.

A) I – III = II

B) I + III = II

C) II + III = I

D) I + II = III

22 / 30

22) Which component of the EKG represents ventricular depolarization?

A) T wave

B) QRS complex

C) P wave

D) PR interval

23 / 30

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

A) Right and left

B) Medial and lateral

C) Anterior and posterior

D) Superior and inferior

24 / 30

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

A) QT interval

B) ST segment

C) QRS complex

D) PR interval

25 / 30

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

A) V4

B) V1

C) V3

D) V2

26 / 30

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

A) Negative

B) Biphasic

C) Positive

D) Isoelectrical

27 / 30

27) 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

28 / 30

28) A normal QT interval is considered to be:

A) More than 500 milliseconds

B) Less than 440 to 460 milliseconds

C) Less than 300 milliseconds

D) Between 300 and 400 milliseconds

29 / 30

29) A normal PR interval is:

A) 120 to 200 milliseconds

B) 60 to 100 milliseconds

C) 200 to 280 milliseconds

D) 80 to 120 milliseconds

30 / 30

30) 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) Negative

D) Positive

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