HOSA EKG EXAM QUESTIONS AND ANSWERS
Course
HOSA EKG
1. What is the normal duration of the PR interval on a standard EKG?
A. 0.04 to 0.12 seconds
B. 0.08 to 0.20 seconds
C. 0.12 to 0.20 seconds
D. 0.20 to 0.40 seconds
Answer: C. 0.12 to 0.20 seconds
2. Which wave represents atrial depolarization on an EKG?
A. T wave
B. P wave
C. QRS complex
D. U wave
Answer: B. P wave
3. How many electrodes are used in a standard 12-lead EKG?
A. 6
B. 10
C. 12
D. 14
Answer: B. 10
4. What does the QRS complex represent?
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial depolarization
Answer: B. Ventricular depolarization
5. Which EKG lead is known as the "rhythm strip"?
A. Lead I
B. Lead II
C. Lead III
D. V1
Answer: B. Lead II
6. What condition is most commonly indicated by a prolonged QT interval?
A. Atrial fibrillation
B. Ventricular tachycardia
C. Torsades de Pointes
D. Bundle branch block
Answer: C. Torsades de Pointes
, 7. Which of the following is the correct placement for the V4 precordial lead?
A. Fifth intercostal space, midclavicular line
B. Fourth intercostal space, left sternal border
C. Fifth intercostal space, anterior axillary line
D. Fourth intercostal space, right sternal border
Answer: A. Fifth intercostal space, midclavicular line
8. What is the paper speed of a standard EKG machine?
A. 10 mm/sec
B. 25 mm/sec
C. 30 mm/sec
D. 50 mm/sec
Answer: B. 25 mm/sec
9. What should you do if a patient’s skin is diaphoretic before applying EKG electrodes?
A. Apply lotion
B. Use alcohol wipes to cleanse the skin and allow it to dry
C. Shave the chest hair
D. Use less gel on the electrode
Answer: B. Use alcohol wipes to cleanse the skin and allow it to dry
10. What is the primary purpose of an EKG?
A. Measure blood pressure
B. Detect lung abnormalities
C. Record the electrical activity of the heart
D. Evaluate brain activity
Answer: C. Record the electrical activity of the heart
11 What is the normal heart rate range for a resting adult on an EKG?
A. 40–60 bpm
B. 60–100 bpm
C. 100–120 bpm
D. 120–160 bpm
Answer: B. 60–100 bpm
12 Which of the following best describes sinus bradycardia?
A. A heart rate above 100 bpm
B. A heart rate below 60 bpm
C. Irregular heart rhythm
D. A flatline on the EKG
Answer: B. A heart rate below 60 bpm
13 Which of the following causes the T wave on an EKG?
A. Atrial depolarization
B. Ventricular depolarization
Course
HOSA EKG
1. What is the normal duration of the PR interval on a standard EKG?
A. 0.04 to 0.12 seconds
B. 0.08 to 0.20 seconds
C. 0.12 to 0.20 seconds
D. 0.20 to 0.40 seconds
Answer: C. 0.12 to 0.20 seconds
2. Which wave represents atrial depolarization on an EKG?
A. T wave
B. P wave
C. QRS complex
D. U wave
Answer: B. P wave
3. How many electrodes are used in a standard 12-lead EKG?
A. 6
B. 10
C. 12
D. 14
Answer: B. 10
4. What does the QRS complex represent?
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial depolarization
Answer: B. Ventricular depolarization
5. Which EKG lead is known as the "rhythm strip"?
A. Lead I
B. Lead II
C. Lead III
D. V1
Answer: B. Lead II
6. What condition is most commonly indicated by a prolonged QT interval?
A. Atrial fibrillation
B. Ventricular tachycardia
C. Torsades de Pointes
D. Bundle branch block
Answer: C. Torsades de Pointes
, 7. Which of the following is the correct placement for the V4 precordial lead?
A. Fifth intercostal space, midclavicular line
B. Fourth intercostal space, left sternal border
C. Fifth intercostal space, anterior axillary line
D. Fourth intercostal space, right sternal border
Answer: A. Fifth intercostal space, midclavicular line
8. What is the paper speed of a standard EKG machine?
A. 10 mm/sec
B. 25 mm/sec
C. 30 mm/sec
D. 50 mm/sec
Answer: B. 25 mm/sec
9. What should you do if a patient’s skin is diaphoretic before applying EKG electrodes?
A. Apply lotion
B. Use alcohol wipes to cleanse the skin and allow it to dry
C. Shave the chest hair
D. Use less gel on the electrode
Answer: B. Use alcohol wipes to cleanse the skin and allow it to dry
10. What is the primary purpose of an EKG?
A. Measure blood pressure
B. Detect lung abnormalities
C. Record the electrical activity of the heart
D. Evaluate brain activity
Answer: C. Record the electrical activity of the heart
11 What is the normal heart rate range for a resting adult on an EKG?
A. 40–60 bpm
B. 60–100 bpm
C. 100–120 bpm
D. 120–160 bpm
Answer: B. 60–100 bpm
12 Which of the following best describes sinus bradycardia?
A. A heart rate above 100 bpm
B. A heart rate below 60 bpm
C. Irregular heart rhythm
D. A flatline on the EKG
Answer: B. A heart rate below 60 bpm
13 Which of the following causes the T wave on an EKG?
A. Atrial depolarization
B. Ventricular depolarization
