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) Biphasic

B) Positive

C) Negative

D) Unchanged

2 / 30

2) The QRS duration is:

A) 120 milliseconds

B) 80 milliseconds

C) 100 milliseconds

D) 160 milliseconds

3 / 30

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

A) Bipolar

B) Neutral

C) Negative

D) Positive

4 / 30

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

A) Isoelectrical

B) Negative

C) Biphasic

D) Positive

5 / 30

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

A) Biphasic

B) Positive

C) Negative

D) Isoelectric

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

A) R junction

B) J point

C) S inflection

D) T point

7 / 30

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

A) Excitability

B) Refractoriness

C) Conductivity

D) Automaticity

8 / 30

8) The PR interval is:

A) 160 milliseconds

B) 200 milliseconds

C) 100 milliseconds

D) 120 milliseconds

9 / 30

9) QTc prolongation can predispose a patient to:

A) Sinus tachycardia

B) Ventricular arrhythmias

C) Atrial fibrillation

D) First-degree heart block

10 / 30

10) Which limb leads are bipolar?

A) II and III

B) I and II

C) I, II, and III

D) aVR, aVL, and aVF

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11) Define Einthoven’s equation.

A) II + III = I

B) I – III = II

C) I + II = III

D) I + III = II

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12) 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

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

A) aVF

B) Lead III

C) Lead II

D) Lead I

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14) aVR is a combination of which leads?

A) aVL and aVF

B) II and III

C) I and II

D) I and III

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

A) Tachycardia

B) Bradycardia

C) Ectopic rhythm

D) Normal sinus rhythm

16 / 30

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

A) Right and left

B) Anterior and posterior

C) Superior and inferior

D) Medial and lateral

17 / 30

17) 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

18 / 30

18) The sinus node is located in the:

A) Low right atrium

B) Interventricular septum

C) Left ventricle

D) High right atrium

19 / 30

19) 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

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

A) Septal fibers

B) Myocardial fibers

C) Endocardial fibers

D) Purkinje fibers

21 / 30

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

A) Biphasic

B) Positive

C) Isoelectrical

D) Negative

22 / 30

22) A normal PR interval is:

A) 120 to 200 milliseconds

B) 200 to 280 milliseconds

C) 60 to 100 milliseconds

D) 80 to 120 milliseconds

23 / 30

23) A normal QRS duration is:

A) 120 to 200 milliseconds

B) 200 to 240 milliseconds

C) 40 to 60 milliseconds

D) 80 to 120 milliseconds

24 / 30

24) aVF is a combination of which leads?

A) II and III

B) aVL and aVR

C) I and II

D) I and III

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

A) V4

B) V2

C) V1

D) V3

26 / 30

26) Which limb leads are unipolar?

A) II and aVL

B) I and aVF

C) aVR, aVL, and aVF

D) I, II, and III

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27) aVL is a combination of which leads?

A) I and III

B) II and III

C) aVR and aVF

D) I and II

28 / 30

28) A normal QT interval is considered to be:

A) Between 300 and 400 milliseconds

B) Less than 300 milliseconds

C) More than 500 milliseconds

D) Less than 440 to 460 milliseconds

29 / 30

29) Which component of the EKG represents ventricular depolarization?

A) P wave

B) PR interval

C) QRS complex

D) T wave

30 / 30

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

A) QRS complex

B) ST segment

C) QT interval

D) PR interval

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