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Quizzes > Health & Medicine

EKG Practice Test: Sharpen Your Certification Skills

Quick, scored EKG quiz with instant feedback-check lead placement, waveforms, and rhythms.

Editorial: Review CompletedCreated By: Headsup CorporationUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for EKG exam practice test quiz on sky blue background

Use this EKG practice test to review lead placement, waveforms, and rhythms before your certification exam and spot areas to refresh. For extra practice, build placement skills with ecg lead placement practice, test your speed with ecg practice test, and drill patterns with ekg rhythm quiz.

What is the standard paper speed for a diagnostic 12-lead ECG in the United States?
100 mm/second
25 mm/second
50 mm/second only
10 mm/second
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The standard gain (calibration) setting for ECG amplitude is equivalent to which measurement?
10 mm equals 1 mV
5 mm equals 1 mV
1 mm equals 1 mV
20 mm equals 1 mV
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Where is precordial lead V1 correctly placed?
4th intercostal space, right sternal border
5th intercostal space, anterior axillary line
4th intercostal space, left sternal border
5th intercostal space, midclavicular line
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Which color is used for the right arm (RA) electrode in the standard U.S. color code?
Red
Green
White
Black
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What is the normal adult PR interval duration?
0.22 to 0.30 seconds
0.12 to 0.20 seconds
0.30 to 0.40 seconds
Less than 0.08 seconds
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A normal adult QRS duration should be:
Less than 0.12 seconds
Exactly 0.12 seconds
0.14 to 0.20 seconds
Greater than 0.20 seconds
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Which electrodes form Lead II in a standard 12-lead ECG?
Right arm negative to left leg positive
Right arm negative to left arm positive
Left leg negative to right leg positive
Left arm negative to right arm positive
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Which augmented limb lead primarily views the right upper portion of the heart and is normally negative in healthy adults?
aVL
aVR
Lead III
aVF
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Which rhythm is characterized by an irregularly irregular ventricular response with no distinct P waves?
Atrial fibrillation
Atrial flutter with 2:1 block
Sinus arrhythmia
Junctional rhythm
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Atrial flutter typically presents with which atrial activity on ECG?
Peaked T waves
Sawtooth flutter waves at about 250-350 bpm
U waves
Delta waves
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Which finding best supports monomorphic ventricular tachycardia on ECG?
Wide QRS complexes at a rate usually >100 bpm
Narrow QRS complexes at 60-100 bpm
PR interval prolongation
Irregularly irregular rhythm with no P waves
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A pacing spike immediately preceding each wide QRS complex indicates which pacing mode?
Biventricular pacing cannot be identified
Dual-chamber atrial-sensed pacing only
Atrial pacing
Ventricular pacing
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Which electrolyte disturbance commonly prolongs the QT interval?
Hypercalcemia
Hypernatremia
Hyperchloremia
Hypocalcemia
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Which is a hallmark ECG feature of right bundle branch block (RBBB)?
Broad, notched R waves in leads I and aVL only
Pathologic Q waves in inferior leads
rsR' pattern in V1 with QRS duration >=120 ms
Low voltage QRS in all leads
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Which leads and pattern most strongly suggest left bundle branch block (LBBB)?
Peaked T waves in all precordial leads
Narrow QRS with delta waves
Wide QRS with broad monophasic R waves in I, V5, V6 and deep QS in V1
ST elevation in II, III, aVF
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Which combination of lead polarities indicates left axis deviation (LAD)?
Lead I negative, aVF positive
Lead I positive, aVR positive
Lead I positive, aVF negative
Lead I negative, aVF negative
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In posterior myocardial infarction, which anterior leads may show reciprocal ST depression with tall R waves?
V1-V3
V5-V6
I, aVL
II, III, aVF
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Which statement about Einthoven's triangle is correct?
It depicts the augmented unipolar limb leads only
It represents the bipolar limb leads I, II, and III forming an equilateral triangle around the heart
It is only applicable to pediatric ECGs
It is used to locate precordial lead positions
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Which best describes the Wilson central terminal used for unipolar leads?
A direct ground connection on the right leg
An average reference created by connecting RA, LA, and LL through resistors
A chest electrode placed at V2
The positive pole for Lead II
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Lead III measures the potential difference between the left arm (positive) and right leg (negative) electrodes.
True
False
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0

Study Outcomes

  1. Apply Proper Lead Placement -

    Use the ekg exam practice test to master correct electrode positioning for accurate 12-lead ECG recordings and ensure diagnostic-quality tracings.

  2. Interpret Waveforms and Intervals -

    Analyze P waves, QRS complexes, and T waves to distinguish normal and abnormal intervals, boosting your confidence in rhythm assessment.

  3. Identify Common Arrhythmias -

    Recognize cardiac rhythm patterns such as atrial fibrillation, ventricular tachycardia, and asystole through targeted questions on the nha ekg practice test.

  4. Troubleshoot ECG Artifacts -

    Detect and resolve common recording errors and electrical interference, reinforcing your ability to maintain high-quality tracings during patient monitoring.

  5. Evaluate Performance and Plan Improvements -

    Use instant scoring from the ekg practice exam with answers to pinpoint strengths and weaknesses, then create a focused study strategy for exam success.

Cheat Sheet

  1. Accurate 12-Lead Electrode Placement -

    Correct electrode positioning - using the "white on right, smoke over fire" mnemonic - ensures reliable ECG tracings and prevents misdiagnosis of ischemia (American Heart Association). Reinforce placement skills with an ekg practice test free and by marking landmarks on a practice mannequin.

  2. Waveform Durations and Intervals -

    Know that a normal P wave lasts ≤0.12 s, PR interval is 0.12 - 0.20 s, and QRS complex <0.12 s (Textbook of Clinical Electrophysiology). Memorize "P's and Q's" by timing intervals on graph paper during your ekg exam practice test.

  3. Heart Rate Calculation Methods -

    Use the 1500 method for precise rates (1500 small squares/number of R - R intervals) or the quick 300 - 150 - 100 trick for regular rhythms (Cardiac Care Guidelines). Practice both techniques on an nha ekg practice test to build speed and accuracy under timed conditions.

  4. Recognizing Common Dysrhythmias -

    Differentiate atrial fibrillation's "irregularly irregular" pattern from atrial flutter's sawtooth waves by examining multiple ECG strips (Journal of Electrocardiology). Use mnemonics like "Some People Have Poor Circulation" (Supraventricular, PVCs, Heart blocks) during your ekg exam practice test.

  5. Artifact Identification and Troubleshooting -

    Distinguish muscle tremor (irregular spikes), AC interference (uniform 60 Hz zigzags), and wandering baseline by reviewing real-case ECG examples (American College of Cardiology). Apply filter settings and re-check leads on an ekg practice exam with answers to ensure clean, diagnostic-quality tracings.

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