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) 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) Biphasic

D) Negative

2 / 30

2) A normal QRS duration is:

A) 200 to 240 milliseconds

B) 80 to 120 milliseconds

C) 120 to 200 milliseconds

D) 40 to 60 milliseconds

3 / 30

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

A) Purkinje fibers

B) Myocardial fibers

C) Endocardial fibers

D) Septal fibers

4 / 30

4) QTc prolongation can predispose a patient to:

A) Atrial fibrillation

B) Ventricular arrhythmias

C) Sinus tachycardia

D) First-degree heart block

5 / 30

5) A normal PR interval is:

A) 80 to 120 milliseconds

B) 60 to 100 milliseconds

C) 200 to 280 milliseconds

D) 120 to 200 milliseconds

6 / 30

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

A) Positive

B) Isoelectric

C) Negative

D) Biphasic

7 / 30

7) The QRS duration is:

A) 80 milliseconds

B) 100 milliseconds

C) 160 milliseconds

D) 120 milliseconds

8 / 30

8) Which component of the EKG represents ventricular depolarization?

A) P wave

B) T wave

C) QRS complex

D) PR interval

9 / 30

9) The sinus node is located in the:

A) Interventricular septum

B) Left ventricle

C) Low right atrium

D) High right atrium

10 / 30

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

A) Biphasic

B) Negative

C) Positive

D) Isoelectrical

11 / 30

11) 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

12 / 30

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

A) V2

B) V1

C) V4

D) V3

13 / 30

13) Which limb leads are unipolar?

A) I and aVF

B) II and aVL

C) I, II, and III

D) aVR, aVL, and aVF

14 / 30

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

A) Bundle of His

B) Purkinje fibers

C) Sinoatrial node

D) Atrioventricular node

15 / 30

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

A) PR interval

B) QT interval

C) QRS complex

D) ST segment

16 / 30

16) 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

17 / 30

17) aVF is a combination of which leads?

A) aVL and aVR

B) I and II

C) I and III

D) II and III

18 / 30

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

A) Positive

B) Isoelectrical

C) Biphasic

D) Negative

19 / 30

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

A) 120–160 bpm

B) 100–140 bpm

C) 40–60 bpm

D) 60–100 bpm

20 / 30

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

A) Lead III

B) Lead II

C) aVF

D) Lead I

21 / 30

21) Which limb leads are bipolar?

A) I, II, and III

B) II and III

C) I and II

D) aVR, aVL, and aVF

22 / 30

22) aVR is a combination of which leads?

A) I and III

B) I and II

C) aVL and aVF

D) II and III

23 / 30

23) Define Einthoven’s equation.

A) I + II = III

B) I – III = II

C) II + III = I

D) I + III = II

24 / 30

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

A) Ectopic rhythm

B) Tachycardia

C) Normal sinus rhythm

D) Bradycardia

25 / 30

25) The PR interval is:

A) 120 milliseconds

B) 100 milliseconds

C) 200 milliseconds

D) 160 milliseconds

26 / 30

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

A) Automaticity

B) Conductivity

C) Excitability

D) Refractoriness

27 / 30

27) 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

28 / 30

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

A) Neutral

B) Negative

C) Bipolar

D) Positive

29 / 30

29) A normal QT interval is considered to be:

A) More than 500 milliseconds

B) Between 300 and 400 milliseconds

C) Less than 300 milliseconds

D) Less than 440 to 460 milliseconds

30 / 30

30) aVL is a combination of which leads?

A) II and III

B) I and III

C) aVR and aVF

D) I and II

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