ABRET EEG Electroencephalogram
Exam 2026/2027 – Questions and
Answers | 100% Verified | Detailed
Rationales – Pass Guaranteed – A+
Graded| Instant Download Pdf
EEG Instrumentation & Electronics
Q1. The basic unit for measuring current flow is the:
A) Coulomb
B) Volt
C) Ampere
D) Ohm
Correct Answer: C) Ampere
Rationale: Current is measured in amperes (amps). Voltage is
measured in volts, resistance in ohms, and charge in coulombs.
This is a fundamental electrical principle tested on the ABRET
exam .
Q2. The basic unit of resistance is the:
,A) Ampere
B) Volt
C) Ohm
D) Coulomb
Correct Answer: C) Ohm
Rationale: Resistance is the opposition to the flow of direct
current and is measured in ohms (Ω) .
Q3. What is the opposition to the flow of alternating current
known as?
A) Resistance
B) Capacitance
C) Impedance
D) Inductance
Correct Answer: C) Impedance
Rationale: Impedance is the total opposition to the flow of
alternating current, which includes resistance, capacitive
reactance, and inductive reactance. For EEG, impedance is
measured to ensure proper electrode function .
Q4. Impedance differs from resistance because:
,A) Impedance includes capacitance and inductance; resistance
does not
B) Resistance includes capacitance and inductance; impedance
does not
C) They are the same thing
D) Impedance is measured in ohms; resistance is not
Correct Answer: A) Impedance includes capacitance and
inductance; resistance does not
Rationale: Impedance (Z) is the total opposition to AC current,
including resistance (R) and reactance (capacitive + inductive).
EEG uses AC, so impedance is the relevant measurement .
Q5. A common setting for the low-frequency filter (LFF) in
routine EEG is:
A) 0.1 Hz
B) 1 Hz
C) 5 Hz
D) 70 Hz
Correct Answer: B) 1 Hz
Rationale: The low-frequency filter (LFF) attenuates slow activity.
A 1 Hz LFF is typical for routine EEG to reduce slow baseline drift
or sweat artifact while allowing most physiological slow waves
(e.g., delta, theta) to pass .
, Q6. The purpose of a high-pass (low-frequency) filter is to:
A) Attenuate high-frequency noise
B) Allow high frequencies to pass while blocking low frequencies
C) Allow low frequencies to pass while blocking high frequencies
D) Remove 60 Hz interference
Correct Answer: B) Allow high frequencies to pass while
blocking low frequencies
Rationale: A high-pass filter (e.g., 1 Hz) attenuates slow baseline
drift and DC offsets, allowing frequencies above the cutoff to pass.
In EEG terminology, "LF filter" = high-pass filter .
Q7. The purpose of a low-pass (high-frequency) filter is to:
A) Attenuate low-frequency drift
B) Allow low frequencies to pass while blocking high frequencies
C) Allow high frequencies to pass while blocking low frequencies
D) Enhance muscle artifact
Correct Answer: B) Allow low frequencies to pass while
blocking high frequencies
Rationale: A low-pass filter (e.g., 70 Hz) attenuates high-
frequency noise (EMG, 60 Hz harmonics) while preserving EEG
frequencies below the cutoff .
Exam 2026/2027 – Questions and
Answers | 100% Verified | Detailed
Rationales – Pass Guaranteed – A+
Graded| Instant Download Pdf
EEG Instrumentation & Electronics
Q1. The basic unit for measuring current flow is the:
A) Coulomb
B) Volt
C) Ampere
D) Ohm
Correct Answer: C) Ampere
Rationale: Current is measured in amperes (amps). Voltage is
measured in volts, resistance in ohms, and charge in coulombs.
This is a fundamental electrical principle tested on the ABRET
exam .
Q2. The basic unit of resistance is the:
,A) Ampere
B) Volt
C) Ohm
D) Coulomb
Correct Answer: C) Ohm
Rationale: Resistance is the opposition to the flow of direct
current and is measured in ohms (Ω) .
Q3. What is the opposition to the flow of alternating current
known as?
A) Resistance
B) Capacitance
C) Impedance
D) Inductance
Correct Answer: C) Impedance
Rationale: Impedance is the total opposition to the flow of
alternating current, which includes resistance, capacitive
reactance, and inductive reactance. For EEG, impedance is
measured to ensure proper electrode function .
Q4. Impedance differs from resistance because:
,A) Impedance includes capacitance and inductance; resistance
does not
B) Resistance includes capacitance and inductance; impedance
does not
C) They are the same thing
D) Impedance is measured in ohms; resistance is not
Correct Answer: A) Impedance includes capacitance and
inductance; resistance does not
Rationale: Impedance (Z) is the total opposition to AC current,
including resistance (R) and reactance (capacitive + inductive).
EEG uses AC, so impedance is the relevant measurement .
Q5. A common setting for the low-frequency filter (LFF) in
routine EEG is:
A) 0.1 Hz
B) 1 Hz
C) 5 Hz
D) 70 Hz
Correct Answer: B) 1 Hz
Rationale: The low-frequency filter (LFF) attenuates slow activity.
A 1 Hz LFF is typical for routine EEG to reduce slow baseline drift
or sweat artifact while allowing most physiological slow waves
(e.g., delta, theta) to pass .
, Q6. The purpose of a high-pass (low-frequency) filter is to:
A) Attenuate high-frequency noise
B) Allow high frequencies to pass while blocking low frequencies
C) Allow low frequencies to pass while blocking high frequencies
D) Remove 60 Hz interference
Correct Answer: B) Allow high frequencies to pass while
blocking low frequencies
Rationale: A high-pass filter (e.g., 1 Hz) attenuates slow baseline
drift and DC offsets, allowing frequencies above the cutoff to pass.
In EEG terminology, "LF filter" = high-pass filter .
Q7. The purpose of a low-pass (high-frequency) filter is to:
A) Attenuate low-frequency drift
B) Allow low frequencies to pass while blocking high frequencies
C) Allow high frequencies to pass while blocking low frequencies
D) Enhance muscle artifact
Correct Answer: B) Allow low frequencies to pass while
blocking high frequencies
Rationale: A low-pass filter (e.g., 70 Hz) attenuates high-
frequency noise (EMG, 60 Hz harmonics) while preserving EEG
frequencies below the cutoff .
