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) A normal PR interval is:

A) 80 to 120 milliseconds

B) 200 to 280 milliseconds

C) 120 to 200 milliseconds

D) 60 to 100 milliseconds

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

3 / 30

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

A) V4

B) V1

C) V3

D) V2

4 / 30

4) The PR interval is:

A) 100 milliseconds

B) 200 milliseconds

C) 120 milliseconds

D) 160 milliseconds

5 / 30

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

A) Positive

B) Biphasic

C) Isoelectric

D) Negative

6 / 30

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

A) Neutral

B) Bipolar

C) Positive

D) Negative

7 / 30

7) Define Einthoven’s equation.

A) I + III = II

B) I + II = III

C) I – III = II

D) II + III = I

8 / 30

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

A) Positive

B) Isoelectrical

C) Negative

D) Biphasic

9 / 30

9) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) Atrial fibrillation

C) First-degree heart block

D) Ventricular arrhythmias

10 / 30

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

A) Lead III

B) Lead II

C) Lead I

D) aVF

11 / 30

11) 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

12 / 30

12) aVF is a combination of which leads?

A) I and III

B) aVL and aVR

C) II and III

D) I and II

13 / 30

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

A) ST segment

B) PR interval

C) QRS complex

D) QT interval

14 / 30

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

A) Ectopic rhythm

B) Tachycardia

C) Normal sinus rhythm

D) Bradycardia

15 / 30

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

A) Automaticity

B) Conductivity

C) Excitability

D) Refractoriness

16 / 30

16) Which limb leads are unipolar?

A) I and aVF

B) aVR, aVL, and aVF

C) I, II, and III

D) II and aVL

17 / 30

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

A) Negative

B) Positive

C) Isoelectrical

D) Biphasic

18 / 30

18) The QRS duration is:

A) 80 milliseconds

B) 160 milliseconds

C) 100 milliseconds

D) 120 milliseconds

19 / 30

19) aVL is a combination of which leads?

A) I and III

B) aVR and aVF

C) II and III

D) I and II

20 / 30

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

A) S inflection

B) T point

C) J point

D) R junction

21 / 30

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

A) Septal fibers

B) Purkinje fibers

C) Myocardial fibers

D) Endocardial fibers

22 / 30

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

A) Biphasic

B) Negative

C) Unchanged

D) Positive

24 / 30

24) Which component of the EKG represents ventricular depolarization?

A) P wave

B) PR interval

C) T wave

D) QRS complex

25 / 30

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

A) Beginning of the T wave

B) Onset of the ST segment

C) End of the QRS complex

D) Apex of the T wave

26 / 30

26) Which limb leads are bipolar?

A) II and III

B) aVR, aVL, and aVF

C) I, II, and III

D) I and II

27 / 30

27) A normal QRS duration is:

A) 120 to 200 milliseconds

B) 200 to 240 milliseconds

C) 80 to 120 milliseconds

D) 40 to 60 milliseconds

28 / 30

28) A normal QT interval is considered to be:

A) Between 300 and 400 milliseconds

B) More than 500 milliseconds

C) Less than 440 to 460 milliseconds

D) Less than 300 milliseconds

29 / 30

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

A) Bundle of His

B) Sinoatrial node

C) Atrioventricular node

D) Purkinje fibers

30 / 30

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

A) Medial and lateral

B) Superior and inferior

C) Anterior and posterior

D) Right and left

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