EEG Board Exam 2025/2026 – 300
Practice Questions with Verified
Answers | Complete Study
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Instrumentation & Electronics
1. According to ACNS guidelines, what is the recommended
maximum electrode impedance for a clinical EEG recording?
o A) 1,000 ohms
o B) 5,000 ohms (5 kΩ)
o C) 10,000 ohms (10 kΩ)
o D) 20,000 ohms (20 kΩ)
o Answer: B. ACNS guidelines recommend impedances be
below 5 kΩ to ensure high-quality signal and reduce artifact.
2. The filters that create a very narrow band pass and
should rarely be used clinically are:
o A) LFF 1.0 Hz & HFF 70 Hz
o B) LFF 5.0 Hz & HFF 70 Hz
o C) LFF 0.1 Hz & HFF 15 Hz
o D) LFF 5.0 Hz & HFF 15 Hz
o Answer: D. A narrow band pass can severely distort the EEG
and is generally avoided in clinical practice.
3. A spike is printed on paper and measures 16mm peak-to-peak. The
instrument's sensitivity is 7 µV/mm. What is the voltage of the
spike?
o A) 112 µV
o B) 1.2 µV
o C) 12 µV
o D) 224 µV
, o Answer: A. The calculation is 16mm * 7 µV/mm = 112 µV.
Electrode Placement & Montages
4. The distance from Cz to Pz is 6.8cm. What is the total distance from
the nasion to the inion?
o A) 34 cm
o B) 35 cm
o C) 36 cm
o D) 37 cm
o Answer: A. In the 10-20 system, the distance from Cz to Pz is
20% of the total nasion-inion distance. (6.8cm / 0.2 = 34cm).
5. Which electrodes do NOT record directly from the brain?
o A) Depth electrodes
o B) Subdural electrodes
o C) Epidural electrodes
o D) Sub-dermal electrodes
o Answer: D. Sub-dermal (or needle) electrodes are placed just
below the skin and do not record directly from the brain
tissue like the other invasive types.
6. The electrode site located 1 cm above and 1/3 of the distance from
the left external auditory meatus to the left outer canthus is called:
o A) T1
o B) F7
o C) F9
o D) T3
o Answer: A. This is the description for the T1 (or F9 in the
modified system) electrode position in the extended 10-20
system.
Normal Patterns & Artifacts
7. What is the primary purpose of the electrodes Fp1 and Fp2?
o A) To record temporal lobe activity
o B) To monitor vertical eye movements
o C) To monitor mainly horizontal eye movements
o D) To record occipital alpha rhythm
, oAnswer: B. Electrodes in the frontal polar region (Fp1, Fp2)
are very sensitive to electrical potentials generated by vertical
eye movements and blinks.
8. Lambda waves are seen under which conditions?
o A) Eyes closed, relaxed
o B) Eyes open, visual scanning
o C) Stage N2 sleep
o D) REM sleep
o Answer: B. Lambda waves are normal, sharp transients seen
maximally in the occipital region when a patient is awake and
actively scanning a visual scene with their eyes open.
Clinical Correlates & Pathology
9. Thrombosis of the right middle cerebral artery would most likely
cause:
o A) Aphasia
o B) Right-sided paralysis, primarily of the leg
o C) Left-sided paralysis, primarily of the face and arm
o D) Right homonymous hemianopsia
o Answer: C. The middle cerebral artery supplies the lateral
surface of the hemisphere, including the motor cortex for the
face and arm.
10. Which condition is characterized by dementia, myoclonic
jerks, and an EEG showing slowing with diffuse discharges every
0.5-1 second?
o A) Von Recklinghousen's disease
o B) Parkinson's disease
o C) Creutzfeldt-Jakob disease (CJD)
o D) Sturge-Weber syndrome
o Answer: C. CJD is a prion disease with characteristic EEG
findings, including generalized periodic discharges.
11. The basic unit for measuring current flow is the:
• A) Ohm
• B) Volt
, • C) Ampere
• D) Coulomb
• Answer: C. The ampere (A) is the SI base unit for electric current .
12. Which component of an EEG machine stores electrical energy?
• A) Resistor
• B) Inductor
• C) Capacitor
• D) Transformer
• Answer: C. A capacitor stores electrical energy in an electric field .
13. According to ACNS guidelines, what is the recommended
maximum electrode impedance for a clinical EEG recording?
• A) 1,000 ohms
• B) 5,000 ohms (5 kΩ)
• C) 10,000 ohms (10 kΩ)
• D) 20,000 ohms (20 kΩ)
• Answer: B. ACNS guidelines recommend impedances be below 5
kΩ to ensure high-quality signal and reduce artifact .
14. The differential amplifier in an EEG machine is designed to:
• A) Amplify the difference between two input signals
• B) Amplify both input signals equally
• C) Convert AC to DC
• D) Filter out all frequencies above 30 Hz
• Answer: A. A differential amplifier amplifies the voltage difference
between its two inputs while rejecting signals common to both
(common-mode rejection) .
15. What input voltage is necessary to give a calibration deflection
between 5 and 10mm if the sensitivity is 30 µV/mm?
• A) 10 µV
• B) 50 µV
• C) 100 µV
• D) 200 µV
Practice Questions with Verified
Answers | Complete Study
Guide||Guaranteed Pass |Graded A+
Instrumentation & Electronics
1. According to ACNS guidelines, what is the recommended
maximum electrode impedance for a clinical EEG recording?
o A) 1,000 ohms
o B) 5,000 ohms (5 kΩ)
o C) 10,000 ohms (10 kΩ)
o D) 20,000 ohms (20 kΩ)
o Answer: B. ACNS guidelines recommend impedances be
below 5 kΩ to ensure high-quality signal and reduce artifact.
2. The filters that create a very narrow band pass and
should rarely be used clinically are:
o A) LFF 1.0 Hz & HFF 70 Hz
o B) LFF 5.0 Hz & HFF 70 Hz
o C) LFF 0.1 Hz & HFF 15 Hz
o D) LFF 5.0 Hz & HFF 15 Hz
o Answer: D. A narrow band pass can severely distort the EEG
and is generally avoided in clinical practice.
3. A spike is printed on paper and measures 16mm peak-to-peak. The
instrument's sensitivity is 7 µV/mm. What is the voltage of the
spike?
o A) 112 µV
o B) 1.2 µV
o C) 12 µV
o D) 224 µV
, o Answer: A. The calculation is 16mm * 7 µV/mm = 112 µV.
Electrode Placement & Montages
4. The distance from Cz to Pz is 6.8cm. What is the total distance from
the nasion to the inion?
o A) 34 cm
o B) 35 cm
o C) 36 cm
o D) 37 cm
o Answer: A. In the 10-20 system, the distance from Cz to Pz is
20% of the total nasion-inion distance. (6.8cm / 0.2 = 34cm).
5. Which electrodes do NOT record directly from the brain?
o A) Depth electrodes
o B) Subdural electrodes
o C) Epidural electrodes
o D) Sub-dermal electrodes
o Answer: D. Sub-dermal (or needle) electrodes are placed just
below the skin and do not record directly from the brain
tissue like the other invasive types.
6. The electrode site located 1 cm above and 1/3 of the distance from
the left external auditory meatus to the left outer canthus is called:
o A) T1
o B) F7
o C) F9
o D) T3
o Answer: A. This is the description for the T1 (or F9 in the
modified system) electrode position in the extended 10-20
system.
Normal Patterns & Artifacts
7. What is the primary purpose of the electrodes Fp1 and Fp2?
o A) To record temporal lobe activity
o B) To monitor vertical eye movements
o C) To monitor mainly horizontal eye movements
o D) To record occipital alpha rhythm
, oAnswer: B. Electrodes in the frontal polar region (Fp1, Fp2)
are very sensitive to electrical potentials generated by vertical
eye movements and blinks.
8. Lambda waves are seen under which conditions?
o A) Eyes closed, relaxed
o B) Eyes open, visual scanning
o C) Stage N2 sleep
o D) REM sleep
o Answer: B. Lambda waves are normal, sharp transients seen
maximally in the occipital region when a patient is awake and
actively scanning a visual scene with their eyes open.
Clinical Correlates & Pathology
9. Thrombosis of the right middle cerebral artery would most likely
cause:
o A) Aphasia
o B) Right-sided paralysis, primarily of the leg
o C) Left-sided paralysis, primarily of the face and arm
o D) Right homonymous hemianopsia
o Answer: C. The middle cerebral artery supplies the lateral
surface of the hemisphere, including the motor cortex for the
face and arm.
10. Which condition is characterized by dementia, myoclonic
jerks, and an EEG showing slowing with diffuse discharges every
0.5-1 second?
o A) Von Recklinghousen's disease
o B) Parkinson's disease
o C) Creutzfeldt-Jakob disease (CJD)
o D) Sturge-Weber syndrome
o Answer: C. CJD is a prion disease with characteristic EEG
findings, including generalized periodic discharges.
11. The basic unit for measuring current flow is the:
• A) Ohm
• B) Volt
, • C) Ampere
• D) Coulomb
• Answer: C. The ampere (A) is the SI base unit for electric current .
12. Which component of an EEG machine stores electrical energy?
• A) Resistor
• B) Inductor
• C) Capacitor
• D) Transformer
• Answer: C. A capacitor stores electrical energy in an electric field .
13. According to ACNS guidelines, what is the recommended
maximum electrode impedance for a clinical EEG recording?
• A) 1,000 ohms
• B) 5,000 ohms (5 kΩ)
• C) 10,000 ohms (10 kΩ)
• D) 20,000 ohms (20 kΩ)
• Answer: B. ACNS guidelines recommend impedances be below 5
kΩ to ensure high-quality signal and reduce artifact .
14. The differential amplifier in an EEG machine is designed to:
• A) Amplify the difference between two input signals
• B) Amplify both input signals equally
• C) Convert AC to DC
• D) Filter out all frequencies above 30 Hz
• Answer: A. A differential amplifier amplifies the voltage difference
between its two inputs while rejecting signals common to both
(common-mode rejection) .
15. What input voltage is necessary to give a calibration deflection
between 5 and 10mm if the sensitivity is 30 µV/mm?
• A) 10 µV
• B) 50 µV
• C) 100 µV
• D) 200 µV
