BAYCARE EKG TEST QUESTIONS AND
WELL DETAILED ANSWERS PLUS
RATIONALES|| GRADED A+|| LATEST
UPDATE 2026
1. An EKG/ECG records:
A. Blood pressure
B. Electrical activity of the heart
C. Pulse oximetry
D. Breathing rate
Answer: B. Electrical activity of the heart
Rationale: ECG measures depolarization/repolarization of cardiac muscle.*
2. A normal ECG paper speed is:
A. 10 mm/sec
B. 25 mm/sec
C. 50 mm/sec
D. 100 mm/sec
Answer: B. 25 mm/sec
Rationale: Standard speed for accurate interval measurement.*
3. The P wave represents:
A. Ventricular depolarization
B. Atrial depolarization
C. AV node delay
D. Ventricular repolarization
Answer: B. Atrial depolarization
Rationale: The P wave reflects atrial electrical activity.*
,4. The QRS complex corresponds to:
A. Atrial repolarization
B. Ventricular depolarization
C. Atrial contraction
D. Ventricular relaxation
Answer: B. Ventricular depolarization
Rationale: QRS reflects rapid ventricular electrical activation.*
5. A normal PR interval should be:
A. 0.04–0.10 sec
B. 0.12–0.20 sec
C. 0.25–0.35 sec
D. >0.30 sec
Answer: B. 0.12–0.20 sec
Rationale: Normal AV conduction time is 120–200 ms.*
6. The T wave represents:
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial repolarization
D. AV delay
Answer: B. Ventricular repolarization
Rationale: T wave shows ventricular recovery phase.*
7. The U wave, if present, is best seen in:
A. Lead I
B. V2–V3
C. Lead aVR
D. Only inferior leads
Answer: B. V2–V3
Rationale: Prominent U waves often show best in precordial leads.*
,8. ST segment elevation may indicate:
A. Hyperkalemia
B. Myocardial injury or infarction
C. Hypothyroidism
D. Normal variant only
Answer: B. Myocardial injury or infarction
Rationale: ST elevation in contiguous leads suggests acute MI.*
9. A prolonged QT interval increases risk for:
A. Ventricular fibrillation
B. Atrial flutter
C. Bradycardia only
D. Heart block
Answer: A. Ventricular fibrillation
Rationale: Long QT predisposes to torsades de pointes and VF.*
10. Sinus bradycardia is defined as:
A. <60 bpm
B. 60–100 bpm
C. 100–120 bpm
D. >120 bpm
Answer: A. <60 bpm
Rationale: Sinus rhythm with slow rate.*
11. Sinus tachycardia is defined as:
A. <60 bpm
B. 60–100 bpm
C. >100 bpm
D. >120 bpm
, Answer: C. >100 bpm
Rationale: Normal rhythm faster than 100 beats per minute.*
12. Atrial fibrillation on ECG is characterized by:
A. Regular rhythm
B. Sawtooth P waves
C. Irregularly irregular rhythm with absent P waves
D. Prolonged PR interval
Answer: C. Irregularly irregular rhythm with absent P waves
Rationale: AF causes chaotic atrial activity and irregular QRS timing.*
13. A “heart block” implies abnormal conduction at:
A. AV node or His–Purkinje system
B. SA node only
C. Atrial muscle
D. Ventricular muscle
Answer: A. AV node or His–Purkinje system
Rationale: Blocks occur where conduction delays/intercepts signals.*
14. First-degree AV block shows:
A. Absent P waves
B. Prolonged PR interval with 1:1 conduction
C. Dropped beats
D. Ventricular tachycardia
Answer: B. Prolonged PR interval with 1:1 conduction
Rationale: All atrial beats conduct but with delay.*
15. A PVC (premature ventricular contraction) appears as:
A. Normal QRS preceded by P wave
B. Wide, bizarre QRS not preceded by P wave
WELL DETAILED ANSWERS PLUS
RATIONALES|| GRADED A+|| LATEST
UPDATE 2026
1. An EKG/ECG records:
A. Blood pressure
B. Electrical activity of the heart
C. Pulse oximetry
D. Breathing rate
Answer: B. Electrical activity of the heart
Rationale: ECG measures depolarization/repolarization of cardiac muscle.*
2. A normal ECG paper speed is:
A. 10 mm/sec
B. 25 mm/sec
C. 50 mm/sec
D. 100 mm/sec
Answer: B. 25 mm/sec
Rationale: Standard speed for accurate interval measurement.*
3. The P wave represents:
A. Ventricular depolarization
B. Atrial depolarization
C. AV node delay
D. Ventricular repolarization
Answer: B. Atrial depolarization
Rationale: The P wave reflects atrial electrical activity.*
,4. The QRS complex corresponds to:
A. Atrial repolarization
B. Ventricular depolarization
C. Atrial contraction
D. Ventricular relaxation
Answer: B. Ventricular depolarization
Rationale: QRS reflects rapid ventricular electrical activation.*
5. A normal PR interval should be:
A. 0.04–0.10 sec
B. 0.12–0.20 sec
C. 0.25–0.35 sec
D. >0.30 sec
Answer: B. 0.12–0.20 sec
Rationale: Normal AV conduction time is 120–200 ms.*
6. The T wave represents:
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial repolarization
D. AV delay
Answer: B. Ventricular repolarization
Rationale: T wave shows ventricular recovery phase.*
7. The U wave, if present, is best seen in:
A. Lead I
B. V2–V3
C. Lead aVR
D. Only inferior leads
Answer: B. V2–V3
Rationale: Prominent U waves often show best in precordial leads.*
,8. ST segment elevation may indicate:
A. Hyperkalemia
B. Myocardial injury or infarction
C. Hypothyroidism
D. Normal variant only
Answer: B. Myocardial injury or infarction
Rationale: ST elevation in contiguous leads suggests acute MI.*
9. A prolonged QT interval increases risk for:
A. Ventricular fibrillation
B. Atrial flutter
C. Bradycardia only
D. Heart block
Answer: A. Ventricular fibrillation
Rationale: Long QT predisposes to torsades de pointes and VF.*
10. Sinus bradycardia is defined as:
A. <60 bpm
B. 60–100 bpm
C. 100–120 bpm
D. >120 bpm
Answer: A. <60 bpm
Rationale: Sinus rhythm with slow rate.*
11. Sinus tachycardia is defined as:
A. <60 bpm
B. 60–100 bpm
C. >100 bpm
D. >120 bpm
, Answer: C. >100 bpm
Rationale: Normal rhythm faster than 100 beats per minute.*
12. Atrial fibrillation on ECG is characterized by:
A. Regular rhythm
B. Sawtooth P waves
C. Irregularly irregular rhythm with absent P waves
D. Prolonged PR interval
Answer: C. Irregularly irregular rhythm with absent P waves
Rationale: AF causes chaotic atrial activity and irregular QRS timing.*
13. A “heart block” implies abnormal conduction at:
A. AV node or His–Purkinje system
B. SA node only
C. Atrial muscle
D. Ventricular muscle
Answer: A. AV node or His–Purkinje system
Rationale: Blocks occur where conduction delays/intercepts signals.*
14. First-degree AV block shows:
A. Absent P waves
B. Prolonged PR interval with 1:1 conduction
C. Dropped beats
D. Ventricular tachycardia
Answer: B. Prolonged PR interval with 1:1 conduction
Rationale: All atrial beats conduct but with delay.*
15. A PVC (premature ventricular contraction) appears as:
A. Normal QRS preceded by P wave
B. Wide, bizarre QRS not preceded by P wave
