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

A) Positive

B) Isoelectrical

C) Biphasic

D) Negative

2 / 30

2) A normal QRS duration is:

A) 40 to 60 milliseconds

B) 80 to 120 milliseconds

C) 120 to 200 milliseconds

D) 200 to 240 milliseconds

3 / 30

3) 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) S inflection

D) J point

4 / 30

4) aVL is a combination of which leads?

A) I and II

B) I and III

C) II and III

D) aVR and aVF

5 / 30

5) A normal QT interval is considered to be:

A) Less than 300 milliseconds

B) Less than 440 to 460 milliseconds

C) Between 300 and 400 milliseconds

D) More than 500 milliseconds

6 / 30

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

A) Bradycardia

B) Normal sinus rhythm

C) Tachycardia

D) Ectopic rhythm

7 / 30

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

A) Negative

B) Biphasic

C) Positive

D) Isoelectric

8 / 30

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

A) End of the QRS complex

B) Onset of the ST segment

C) Apex of the T wave

D) Beginning of the T wave

9 / 30

9) Which limb leads are bipolar?

A) I, II, and III

B) I and II

C) aVR, aVL, and aVF

D) II and III

10 / 30

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

A) 120–160 bpm

B) 40–60 bpm

C) 60–100 bpm

D) 100–140 bpm

11 / 30

11) The QRS duration is:

A) 80 milliseconds

B) 160 milliseconds

C) 100 milliseconds

D) 120 milliseconds

12 / 30

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

A) Negative

B) Biphasic

C) Isoelectrical

D) Positive

13 / 30

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

A) Positive

B) Negative

C) Unchanged

D) Biphasic

14 / 30

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

A) Lead I

B) Lead III

C) Lead II

D) aVF

15 / 30

15) The sinus node is located in the:

A) Low right atrium

B) Left ventricle

C) High right atrium

D) Interventricular septum

16 / 30

16) Which component of the EKG represents ventricular depolarization?

A) PR interval

B) T wave

C) P wave

D) QRS complex

17 / 30

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

A) V4

B) V1

C) V2

D) V3

18 / 30

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

A) Atrioventricular node

B) Purkinje fibers

C) Bundle of His

D) Sinoatrial node

19 / 30

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

A) Negative

B) Bipolar

C) Positive

D) Neutral

20 / 30

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

A) Refractoriness

B) Excitability

C) Conductivity

D) Automaticity

21 / 30

21) The PR interval is:

A) 200 milliseconds

B) 120 milliseconds

C) 160 milliseconds

D) 100 milliseconds

22 / 30

22) aVF is a combination of which leads?

A) I and III

B) aVL and aVR

C) I and II

D) II and III

23 / 30

23) 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

24 / 30

24) aVR is a combination of which leads?

A) II and III

B) aVL and aVF

C) I and III

D) I and II

25 / 30

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

A) Purkinje fibers

B) Septal fibers

C) Endocardial fibers

D) Myocardial fibers

26 / 30

26) A normal PR interval is:

A) 200 to 280 milliseconds

B) 60 to 100 milliseconds

C) 80 to 120 milliseconds

D) 120 to 200 milliseconds

27 / 30

27) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) Atrial fibrillation

C) First-degree heart block

D) Ventricular arrhythmias

28 / 30

28) Define Einthoven’s equation.

A) II + III = I

B) I + II = III

C) I + III = II

D) I – III = II

29 / 30

29) Which limb leads are unipolar?

A) I, II, and III

B) I and aVF

C) II and aVL

D) aVR, aVL, and aVF

30 / 30

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

A) Superior and inferior

B) Anterior and posterior

C) Right and left

D) Medial and lateral

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