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) 120 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 200 milliseconds

2 / 30

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

A) aVF

B) Lead I

C) Lead II

D) Lead III

3 / 30

3) Define Einthoven’s equation.

A) II + III = I

B) I + III = II

C) I – III = II

D) I + II = III

4 / 30

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

A) Purkinje fibers

B) Myocardial fibers

C) Septal fibers

D) Endocardial fibers

5 / 30

5) Which limb leads are unipolar?

A) I, II, and III

B) aVR, aVL, and aVF

C) II and aVL

D) I and aVF

6 / 30

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

A) V2

B) V3

C) V4

D) V1

7 / 30

7) The sinus node is located in the:

A) Low right atrium

B) Interventricular septum

C) Left ventricle

D) High right atrium

8 / 30

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

A) Positive

B) Negative

C) Isoelectrical

D) Biphasic

9 / 30

9) Which limb leads are bipolar?

A) I, II, and III

B) aVR, aVL, and aVF

C) I and II

D) II and III

10 / 30

10) aVR is a combination of which leads?

A) I and II

B) aVL and aVF

C) II and III

D) I and III

11 / 30

11) A normal QT interval is considered to be:

A) Less than 440 to 460 milliseconds

B) Between 300 and 400 milliseconds

C) More than 500 milliseconds

D) Less than 300 milliseconds

12 / 30

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

A) Biphasic

B) Unchanged

C) Positive

D) Negative

13 / 30

13) Which component of the EKG represents ventricular depolarization?

A) T wave

B) PR interval

C) P wave

D) QRS complex

14 / 30

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

A) 40–60 bpm

B) 60–100 bpm

C) 120–160 bpm

D) 100–140 bpm

15 / 30

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

A) Atrioventricular node

B) Sinoatrial node

C) Purkinje fibers

D) Bundle of His

16 / 30

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

A) Refractoriness

B) Excitability

C) Automaticity

D) Conductivity

17 / 30

17) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 40 to 60 milliseconds

C) 120 to 200 milliseconds

D) 80 to 120 milliseconds

18 / 30

18) The QRS duration is:

A) 120 milliseconds

B) 160 milliseconds

C) 80 milliseconds

D) 100 milliseconds

19 / 30

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

A) Apex of the T wave

B) Onset of the ST segment

C) Beginning of the T wave

D) End of the QRS complex

20 / 30

20) aVF is a combination of which leads?

A) II and III

B) I and II

C) I and III

D) aVL and aVR

21 / 30

21) aVL is a combination of which leads?

A) II and III

B) aVR and aVF

C) I and III

D) I and II

22 / 30

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

A) Neutral

B) Bipolar

C) Positive

D) Negative

23 / 30

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

A) PR interval

B) ST segment

C) QT interval

D) QRS complex

24 / 30

24) A normal PR interval is:

A) 200 to 280 milliseconds

B) 80 to 120 milliseconds

C) 60 to 100 milliseconds

D) 120 to 200 milliseconds

25 / 30

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

A) Isoelectric

B) Positive

C) Negative

D) Biphasic

26 / 30

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

A) Isoelectrical

B) Negative

C) Biphasic

D) Positive

27 / 30

27) 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

28 / 30

28) QTc prolongation can predispose a patient to:

A) First-degree heart block

B) Ventricular arrhythmias

C) Sinus tachycardia

D) Atrial fibrillation

29 / 30

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

A) Ectopic rhythm

B) Normal sinus rhythm

C) Bradycardia

D) Tachycardia

30 / 30

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

A) Medial and lateral

B) Anterior and posterior

C) Right and left

D) Superior and inferior

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