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NHA CETFree Certified EKG Technician practice test
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Where should the V1 electrode be placed for a standard 12-lead EKG?
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All 10 NHA CET questions & answers
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Q1. Where should the V1 electrode be placed for a standard 12-lead EKG?
Correct answer: A. Fourth intercostal space, right sternal border
V1 is placed at the fourth intercostal space at the right sternal border; V2 occupies the mirror position on the left.
Q2. Where should the V2 electrode be placed?
Correct answer: B. Fourth intercostal space, left sternal border
V2 sits at the fourth intercostal space along the left sternal border, directly across from V1.
Q3. The V3 electrode is correctly positioned:
Correct answer: C. Midway between the V2 and V4 electrode positions
V3 does not have its own intercostal landmark; it is placed diagonally halfway between V2 and V4.
Q4. Correct placement of the V4 electrode is:
Correct answer: D. Fifth intercostal space, left midclavicular line
V4 is placed at the fifth intercostal space in the left midclavicular line, and V5/V6 are then placed at that same horizontal level.
Q5. The V5 electrode should be placed:
Correct answer: A. Left anterior axillary line, at the same horizontal level as V4
V5 and V6 are not tied to a new intercostal space; they follow the horizontal line established by V4, moving laterally to the anterior and midaxillary lines.
Q6. The V6 electrode is placed at the:
Correct answer: B. Left midaxillary line, level with V4 and V5
V6 completes the precordial line at the left midaxillary line, level with V4 and V5.
Q7. In the standard limb lead color-coding scheme, which electrode color is placed on the left leg?
Correct answer: C. Red
The common convention is white for right arm, black for left arm, green for right leg (ground), and red for left leg.
Q8. During calibration, a standard 1 millivolt signal should produce a deflection of:
Correct answer: D. 10 mm
Standard EKG calibration is set so that 1 mV produces a 10 mm deflection on the tracing.
Q9. The standard paper speed for a routine 12-lead EKG is:
Correct answer: A. 25 mm/sec
Routine EKG tracings are recorded at a standard paper speed of 25 mm per second unless otherwise noted.
Q10. A wandering, unstable baseline on the EKG tracing is most often caused by:
Correct answer: B. Loose or poorly adhered electrodes and patient movement
Poor electrode contact, patient movement, and respiration commonly cause the baseline to drift up and down.
Exam facts and objectives sourced from the official NHA (National Healthcareer Association) certification page. Last reviewed June 2026.
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