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) The PR interval is:

A) 200 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 120 milliseconds

2 / 30

2) The sinus node is located in the:

A) Left ventricle

B) Interventricular septum

C) High right atrium

D) Low right atrium

3 / 30

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

A) Bundle of His

B) Purkinje fibers

C) Atrioventricular node

D) Sinoatrial node

4 / 30

4) aVR is a combination of which leads?

A) I and III

B) II and III

C) aVL and aVF

D) I and II

5 / 30

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

A) T point

B) J point

C) S inflection

D) R junction

6 / 30

6) 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

7 / 30

7) Which limb leads are bipolar?

A) aVR, aVL, and aVF

B) I, II, and III

C) II and III

D) I and II

8 / 30

8) The QRS duration is:

A) 160 milliseconds

B) 100 milliseconds

C) 80 milliseconds

D) 120 milliseconds

9 / 30

9) aVL is a combination of which leads?

A) aVR and aVF

B) II and III

C) I and II

D) I and III

10 / 30

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

A) PR interval

B) QRS complex

C) QT interval

D) ST segment

11 / 30

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

A) Unchanged

B) Positive

C) Negative

D) Biphasic

12 / 30

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

A) Anterior and posterior

B) Medial and lateral

C) Superior and inferior

D) Right and left

13 / 30

13) QTc prolongation can predispose a patient to:

A) Atrial fibrillation

B) Sinus tachycardia

C) First-degree heart block

D) Ventricular arrhythmias

14 / 30

14) 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

15 / 30

15) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 120 to 200 milliseconds

C) 40 to 60 milliseconds

D) 80 to 120 milliseconds

16 / 30

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

A) Septal fibers

B) Myocardial fibers

C) Endocardial fibers

D) Purkinje fibers

17 / 30

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

A) Negative

B) Isoelectrical

C) Biphasic

D) Positive

18 / 30

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

A) V2

B) V3

C) V1

D) V4

19 / 30

19) Which limb leads are unipolar?

A) I, II, and III

B) II and aVL

C) aVR, aVL, and aVF

D) I and aVF

20 / 30

20) Define Einthoven’s equation.

A) I + II = III

B) I – III = II

C) II + III = I

D) I + III = II

21 / 30

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

A) Neutral

B) Negative

C) Bipolar

D) Positive

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

A) Negative

B) Isoelectric

C) Positive

D) Biphasic

24 / 30

24) aVF is a combination of which leads?

A) II and III

B) I and II

C) I and III

D) aVL and aVR

25 / 30

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

A) 100–140 bpm

B) 120–160 bpm

C) 40–60 bpm

D) 60–100 bpm

26 / 30

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

A) Lead III

B) Lead I

C) aVF

D) Lead II

27 / 30

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

A) Isoelectrical

B) Biphasic

C) Positive

D) Negative

28 / 30

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

A) Bradycardia

B) Tachycardia

C) Ectopic rhythm

D) Normal sinus rhythm

29 / 30

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

A) Beginning of the T wave

B) End of the QRS complex

C) Onset of the ST segment

D) Apex of the T wave

30 / 30

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

A) Automaticity

B) Refractoriness

C) Excitability

D) Conductivity

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