EKG CLEP MIDTERM EXAM
QUESTIONS WITH VERIFIED
ANSWERS.NEW UPDATE. JUST
RELEASED
1. What is the standard paper speed for a 12-lead EKG?
A. 10 mm/sec
B. 5 mm/sec
C. 50 mm/sec
D. 25 mm/sec
Answer: D
Conceptual Explanation: The standard paper speed for recording an EKG is 25 mm/sec,
where each small block represents 0.04 seconds.
2. Which interval represents the time from the start of atrial depolarization to the start of
ventricular depolarization?
A. QT Interval
B. RR Interval
C. ST Segment
D. PR Interval
,Answer: D
Conceptual Explanation: The PR interval measures the time it takes for the impulse to
travel from the SA node through the AV node, typically 0.12 to 0.20 seconds.
3. A PR interval of 0.24 seconds with a 1:1 P to QRS ratio is indicative of:
A. Second-degree AV block Type I
B. First-degree AV block
C. Second-degree AV block Type II
D. Third-degree AV block
Answer: B
Conceptual Explanation: First-degree AV block is characterized by a constant PR interval
greater than 0.20 seconds without any dropped QRS complexes.
4. Which lead is placed at the fourth intercostal space, just to the right of the sternum?
A. V4
B. V2
C. V1
D. V3
Answer: C
, Conceptual Explanation: Lead V1 is the first precordial lead and is positioned in the 4th
intercostal space at the right sternal border.
5. The ‘Sawtooth’ pattern is a classic sign of which arrhythmia?
A. Atrial Fibrillation
B. Ventricular Tachycardia
C. Atrial Flutter
D. Sinus Tachycardia
Answer: C
Conceptual Explanation: Atrial Flutter is characterized by rapid, regular ‘F’ waves that
resemble the teeth of a saw.
6. What is the intrinsic firing rate of the Atrioventricular (AV) node?
A. 60-100 bpm
B. 20-40 bpm
C. 40-60 bpm
D. 80-100 bpm
Answer: C
Conceptual Explanation: The AV node serves as a secondary pacemaker with an intrinsic
rate of 40 to 60 beats per minute.
QUESTIONS WITH VERIFIED
ANSWERS.NEW UPDATE. JUST
RELEASED
1. What is the standard paper speed for a 12-lead EKG?
A. 10 mm/sec
B. 5 mm/sec
C. 50 mm/sec
D. 25 mm/sec
Answer: D
Conceptual Explanation: The standard paper speed for recording an EKG is 25 mm/sec,
where each small block represents 0.04 seconds.
2. Which interval represents the time from the start of atrial depolarization to the start of
ventricular depolarization?
A. QT Interval
B. RR Interval
C. ST Segment
D. PR Interval
,Answer: D
Conceptual Explanation: The PR interval measures the time it takes for the impulse to
travel from the SA node through the AV node, typically 0.12 to 0.20 seconds.
3. A PR interval of 0.24 seconds with a 1:1 P to QRS ratio is indicative of:
A. Second-degree AV block Type I
B. First-degree AV block
C. Second-degree AV block Type II
D. Third-degree AV block
Answer: B
Conceptual Explanation: First-degree AV block is characterized by a constant PR interval
greater than 0.20 seconds without any dropped QRS complexes.
4. Which lead is placed at the fourth intercostal space, just to the right of the sternum?
A. V4
B. V2
C. V1
D. V3
Answer: C
, Conceptual Explanation: Lead V1 is the first precordial lead and is positioned in the 4th
intercostal space at the right sternal border.
5. The ‘Sawtooth’ pattern is a classic sign of which arrhythmia?
A. Atrial Fibrillation
B. Ventricular Tachycardia
C. Atrial Flutter
D. Sinus Tachycardia
Answer: C
Conceptual Explanation: Atrial Flutter is characterized by rapid, regular ‘F’ waves that
resemble the teeth of a saw.
6. What is the intrinsic firing rate of the Atrioventricular (AV) node?
A. 60-100 bpm
B. 20-40 bpm
C. 40-60 bpm
D. 80-100 bpm
Answer: C
Conceptual Explanation: The AV node serves as a secondary pacemaker with an intrinsic
rate of 40 to 60 beats per minute.
