Certified EKG Technician (CET) Practice Practice
Questions WITH CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |INSTANT
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1. Which of the following best describes the P wave on an
EKG?
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer: B) Atrial depolarization – The P wave represents the
electrical activity as the atria contract, initiating the heartbeat.
2. What is the normal range for a PR interval in an adult?
A) 0.04–0.10 seconds
B) 0.12–0.20 seconds
C) 0.20–0.28 seconds
D) 0.30–0.40 seconds
Answer: B) 0.12–0.20 seconds – A normal PR interval indicates
proper conduction from the atria to the ventricles.
3. Which lead is considered the "standard limb lead"?
A) Lead I
B) Lead II
C) Lead III
D) Lead aVR
,Answer: A) Lead I – Lead I records the electrical difference
between the right arm and left arm.
4. The QRS complex represents which cardiac activity?
A) Atrial depolarization
B) Ventricular depolarization
C) Atrial repolarization
D) Ventricular repolarization
Answer: B) Ventricular depolarization – It shows the electrical
impulses spreading through the ventricles.
5. Which of the following is a common artifact caused by
patient movement?
A) Somatic tremor
B) Wandering baseline
C) AC interference
D) QRS distortion
Answer: A) Somatic tremor – Muscle movement can create
irregular, spiky waves on the EKG tracing.
6. Which electrode placement is correct for lead V1?
A) Fourth intercostal space, right sternal border
B) Fourth intercostal space, left sternal border
C) Fifth intercostal space, midclavicular line
D) Sixth intercostal space, left anterior axillary line
Answer: A) Fourth intercostal space, right sternal border – This
placement is standard for precordial leads.
7. What is the heart rate of a rhythm with 12 large boxes
between R waves?
, A) 50 bpm
B) 60 bpm
C) 75 bpm
D) 100 bpm
Answer: B) 60 bpm – Using the large box method, 300 ÷ 5 large
boxes = 60 bpm.
8. Which condition may be indicated by ST-segment
elevation?
A) Myocardial infarction
B) Hypokalemia
C) Atrial fibrillation
D) Heart block
Answer: A) Myocardial infarction – ST elevation often signals
acute myocardial injury.
9. The correct sequence of cardiac conduction is:
A) AV node → SA node → bundle of His → Purkinje fibers
B) SA node → AV node → bundle of His → Purkinje fibers
C) SA node → Purkinje fibers → AV node → bundle of His
D) AV node → Purkinje fibers → SA node → bundle of His
Answer: B) SA node → AV node → bundle of His → Purkinje
fibers – This is the normal pathway for electrical impulses in the
heart.
10. Which electrolyte imbalance may cause peaked T waves?
A) Hypokalemia
B) Hyperkalemia
C) Hypocalcemia
Questions WITH CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |INSTANT
DOWNLOAD PDF
1. Which of the following best describes the P wave on an
EKG?
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer: B) Atrial depolarization – The P wave represents the
electrical activity as the atria contract, initiating the heartbeat.
2. What is the normal range for a PR interval in an adult?
A) 0.04–0.10 seconds
B) 0.12–0.20 seconds
C) 0.20–0.28 seconds
D) 0.30–0.40 seconds
Answer: B) 0.12–0.20 seconds – A normal PR interval indicates
proper conduction from the atria to the ventricles.
3. Which lead is considered the "standard limb lead"?
A) Lead I
B) Lead II
C) Lead III
D) Lead aVR
,Answer: A) Lead I – Lead I records the electrical difference
between the right arm and left arm.
4. The QRS complex represents which cardiac activity?
A) Atrial depolarization
B) Ventricular depolarization
C) Atrial repolarization
D) Ventricular repolarization
Answer: B) Ventricular depolarization – It shows the electrical
impulses spreading through the ventricles.
5. Which of the following is a common artifact caused by
patient movement?
A) Somatic tremor
B) Wandering baseline
C) AC interference
D) QRS distortion
Answer: A) Somatic tremor – Muscle movement can create
irregular, spiky waves on the EKG tracing.
6. Which electrode placement is correct for lead V1?
A) Fourth intercostal space, right sternal border
B) Fourth intercostal space, left sternal border
C) Fifth intercostal space, midclavicular line
D) Sixth intercostal space, left anterior axillary line
Answer: A) Fourth intercostal space, right sternal border – This
placement is standard for precordial leads.
7. What is the heart rate of a rhythm with 12 large boxes
between R waves?
, A) 50 bpm
B) 60 bpm
C) 75 bpm
D) 100 bpm
Answer: B) 60 bpm – Using the large box method, 300 ÷ 5 large
boxes = 60 bpm.
8. Which condition may be indicated by ST-segment
elevation?
A) Myocardial infarction
B) Hypokalemia
C) Atrial fibrillation
D) Heart block
Answer: A) Myocardial infarction – ST elevation often signals
acute myocardial injury.
9. The correct sequence of cardiac conduction is:
A) AV node → SA node → bundle of His → Purkinje fibers
B) SA node → AV node → bundle of His → Purkinje fibers
C) SA node → Purkinje fibers → AV node → bundle of His
D) AV node → Purkinje fibers → SA node → bundle of His
Answer: B) SA node → AV node → bundle of His → Purkinje
fibers – This is the normal pathway for electrical impulses in the
heart.
10. Which electrolyte imbalance may cause peaked T waves?
A) Hypokalemia
B) Hyperkalemia
C) Hypocalcemia
