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NHA EKG PRACTICE EXAM (3 PRACTICE EXAM)
CONTAINS 200 REAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
Question 1
What does the “P” wave on an EKG represent?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. Cardiac relaxation
Answer: B. Atrial depolarization
Rationale: The P wave represents the electrical impulse traveling through the
atria, causing atrial contraction.
Question 2
Which heart chamber is primarily responsible for pumping oxygenated blood to
the body?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
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Rationale: The left ventricle pumps oxygenated blood into systemic circulation
through the aorta.
Question 3
A normal resting adult heart rate is:
A. 20–40 bpm
B. 40–60 bpm
C. 60–100 bpm
D. 120–160 bpm
Answer: C. 60–100 bpm
Rationale: The normal adult resting heart rate ranges from 60 to 100 beats per
minute.
Question 4
Which EKG paper measurement represents 0.20 seconds?
A. One small box
B. Two small boxes
C. Three small boxes
D. One large box
Answer: D. One large box
Rationale: One large box on EKG paper equals 0.20 seconds.
Question 5
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The QRS complex represents:
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular relaxation
D. SA node firing
Answer: B. Ventricular depolarization
Rationale: The QRS complex indicates electrical stimulation of the ventricles
causing contraction.
Question 6
Which electrode color is placed on the right arm in a standard 4-lead EKG?
A. Black
B. Green
C. White
D. Red
Answer: C. White
Rationale: White is placed on the right arm using the common “white on right”
mnemonic.
Question 7
Sinus bradycardia is defined as a heart rate less than:
A. 40 bpm
B. 50 bpm
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C. 60 bpm
D. 100 bpm
Answer: C. 60 bpm
Rationale: Sinus bradycardia occurs when the heart rate is below 60 bpm.
Question 8
What is the purpose of conductive gel on EKG electrodes?
A. Reduce patient discomfort
B. Improve electrical conduction
C. Prevent skin irritation
D. Increase heart rate
Answer: B. Improve electrical conduction
Rationale: Conductive gel enhances transmission of electrical impulses from the
skin to the electrodes.
Question 9
Which cardiac rhythm is considered life-threatening?
A. Normal sinus rhythm
B. Sinus arrhythmia
C. Ventricular fibrillation
D. Sinus bradycardia
Answer: C. Ventricular fibrillation
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NHA EKG PRACTICE EXAM (3 PRACTICE EXAM)
CONTAINS 200 REAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
Question 1
What does the “P” wave on an EKG represent?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. Cardiac relaxation
Answer: B. Atrial depolarization
Rationale: The P wave represents the electrical impulse traveling through the
atria, causing atrial contraction.
Question 2
Which heart chamber is primarily responsible for pumping oxygenated blood to
the body?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
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Rationale: The left ventricle pumps oxygenated blood into systemic circulation
through the aorta.
Question 3
A normal resting adult heart rate is:
A. 20–40 bpm
B. 40–60 bpm
C. 60–100 bpm
D. 120–160 bpm
Answer: C. 60–100 bpm
Rationale: The normal adult resting heart rate ranges from 60 to 100 beats per
minute.
Question 4
Which EKG paper measurement represents 0.20 seconds?
A. One small box
B. Two small boxes
C. Three small boxes
D. One large box
Answer: D. One large box
Rationale: One large box on EKG paper equals 0.20 seconds.
Question 5
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The QRS complex represents:
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular relaxation
D. SA node firing
Answer: B. Ventricular depolarization
Rationale: The QRS complex indicates electrical stimulation of the ventricles
causing contraction.
Question 6
Which electrode color is placed on the right arm in a standard 4-lead EKG?
A. Black
B. Green
C. White
D. Red
Answer: C. White
Rationale: White is placed on the right arm using the common “white on right”
mnemonic.
Question 7
Sinus bradycardia is defined as a heart rate less than:
A. 40 bpm
B. 50 bpm
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C. 60 bpm
D. 100 bpm
Answer: C. 60 bpm
Rationale: Sinus bradycardia occurs when the heart rate is below 60 bpm.
Question 8
What is the purpose of conductive gel on EKG electrodes?
A. Reduce patient discomfort
B. Improve electrical conduction
C. Prevent skin irritation
D. Increase heart rate
Answer: B. Improve electrical conduction
Rationale: Conductive gel enhances transmission of electrical impulses from the
skin to the electrodes.
Question 9
Which cardiac rhythm is considered life-threatening?
A. Normal sinus rhythm
B. Sinus arrhythmia
C. Ventricular fibrillation
D. Sinus bradycardia
Answer: C. Ventricular fibrillation
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