Practice Test GeeksECG (Electrocardiogram) Practice Test
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Online Electrocardiogram Flashcards

7 cards from real ECG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Online Electrocardiogram flashcards as text

  1. The QRS complex on an ECG primarily represents:

    Answer: Ventricular depolarization

    The QRS complex reflects depolarization of the ventricles.

  2. Which electrode color is standard for the right arm in the AHA labeling system?

    Answer: White

    Under AHA labeling, the right arm electrode is white.

  3. The natural pacemaker of the heart is the:

    Answer: SA node

    The sinoatrial (SA) node initiates each normal heartbeat.

  4. Muscle tremor (somatic) artifact appears on an ECG as:

    Answer: Irregular, jagged, rapid spikes

    Muscle tremor produces irregular, jagged spikes across the baseline.

  5. How many seconds does one large box on standard ECG paper represent?

    Answer: 0.20 sec

    One large box equals 0.20 seconds at 25 mm/sec.

  6. Before applying chest electrodes, the technician should:

    Answer: Clean and prep the skin site

    Skin should be cleaned and prepped to ensure good electrode contact.

  7. The T wave on an ECG represents:

    Answer: Ventricular repolarization

    The T wave reflects repolarization (recovery) of the ventricles.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. nhanow.com — Passing score, test delivery, eligibility, renewal, score release, time limit · verified Oct 2026
  2. cci-online.org — Test delivery, fees, exam format, passing score, renewal, score release · verified Oct 2026