Ohio Neurodiagnostic Technologist
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Rationales 2025|2026 Q&A | Instant
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1. The primary function of an EEG is to record:
a) Cardiac activity
b) Electrical activity of the brain
c) Muscle activity
d) Eye movements
Rationale: EEG records the brain’s electrical activity through scalp
electrodes to assess cerebral function.
2. The 10–20 system refers to:
a) Electrode impedance testing
b) Electrode placement standardization
, c) Frequency calibration
d) Waveform analysis
Rationale: The 10–20 system ensures consistent electrode placement
based on head measurements.
3. Which electrode is located at the frontal midline?
a) F3
b) Fz
c) Cz
d) Pz
Rationale: Fz is the midline frontal electrode in the 10–20 system.
4. Alpha rhythm is typically seen in which region?
a) Frontal
b) Central
c) Occipital
d) Temporal
Rationale: Alpha rhythm appears in the occipital region when the
eyes are closed and the patient is relaxed.
5. The normal frequency range for alpha rhythm is:
a) 0.5–4 Hz
b) 4–7 Hz
c) 8–13 Hz
d) 14–30 Hz
, Rationale: Alpha rhythm frequency is between 8 and 13 Hz,
characteristic of a relaxed, awake adult.
6. Which of the following best describes artifact?
a) Pathologic brain activity
b) Non-cerebral signal contaminating EEG
c) Normal EEG rhythm
d) Seizure discharge
Rationale: Artifacts are unwanted signals from sources like muscle,
eye, or electrical interference.
7. The typical electrode impedance for EEG should be:
a) Above 10 kΩ
b) Below 100 Ω
c) Between 1–5 kΩ
d) Between 5–10 Ω
Rationale: Impedance between 1–5 kΩ ensures optimal recording
quality with minimal noise.
8. The main purpose of hyperventilation during EEG is to:
a) Relax the patient
b) Activate latent epileptiform discharges
c) Measure oxygen saturation
d) Induce sleep
Rationale: Hyperventilation can provoke epileptiform discharges,
especially in absence seizures.
, 9. The posterior dominant rhythm refers to:
a) Theta waves
b) Beta waves
c) Alpha rhythm in occipital region
d) Delta rhythm
Rationale: Posterior dominant rhythm is the alpha rhythm seen in the
occipital lobes.
10. In an adult EEG, delta activity indicates:
a) Normal awake rhythm
b) Abnormal slowing
c) REM sleep
d) Alpha blocking
Rationale: Delta waves (<4 Hz) are normal in sleep but abnormal
when awake, indicating dysfunction.
11. EMG measures:
a) Electrical activity of skeletal muscles
b) Brain waves
c) Cardiac conduction
d) Reflex latency
Rationale: EMG evaluates muscle electrical activity to detect
neuromuscular disorders.
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. The primary function of an EEG is to record:
a) Cardiac activity
b) Electrical activity of the brain
c) Muscle activity
d) Eye movements
Rationale: EEG records the brain’s electrical activity through scalp
electrodes to assess cerebral function.
2. The 10–20 system refers to:
a) Electrode impedance testing
b) Electrode placement standardization
, c) Frequency calibration
d) Waveform analysis
Rationale: The 10–20 system ensures consistent electrode placement
based on head measurements.
3. Which electrode is located at the frontal midline?
a) F3
b) Fz
c) Cz
d) Pz
Rationale: Fz is the midline frontal electrode in the 10–20 system.
4. Alpha rhythm is typically seen in which region?
a) Frontal
b) Central
c) Occipital
d) Temporal
Rationale: Alpha rhythm appears in the occipital region when the
eyes are closed and the patient is relaxed.
5. The normal frequency range for alpha rhythm is:
a) 0.5–4 Hz
b) 4–7 Hz
c) 8–13 Hz
d) 14–30 Hz
, Rationale: Alpha rhythm frequency is between 8 and 13 Hz,
characteristic of a relaxed, awake adult.
6. Which of the following best describes artifact?
a) Pathologic brain activity
b) Non-cerebral signal contaminating EEG
c) Normal EEG rhythm
d) Seizure discharge
Rationale: Artifacts are unwanted signals from sources like muscle,
eye, or electrical interference.
7. The typical electrode impedance for EEG should be:
a) Above 10 kΩ
b) Below 100 Ω
c) Between 1–5 kΩ
d) Between 5–10 Ω
Rationale: Impedance between 1–5 kΩ ensures optimal recording
quality with minimal noise.
8. The main purpose of hyperventilation during EEG is to:
a) Relax the patient
b) Activate latent epileptiform discharges
c) Measure oxygen saturation
d) Induce sleep
Rationale: Hyperventilation can provoke epileptiform discharges,
especially in absence seizures.
, 9. The posterior dominant rhythm refers to:
a) Theta waves
b) Beta waves
c) Alpha rhythm in occipital region
d) Delta rhythm
Rationale: Posterior dominant rhythm is the alpha rhythm seen in the
occipital lobes.
10. In an adult EEG, delta activity indicates:
a) Normal awake rhythm
b) Abnormal slowing
c) REM sleep
d) Alpha blocking
Rationale: Delta waves (<4 Hz) are normal in sleep but abnormal
when awake, indicating dysfunction.
11. EMG measures:
a) Electrical activity of skeletal muscles
b) Brain waves
c) Cardiac conduction
d) Reflex latency
Rationale: EMG evaluates muscle electrical activity to detect
neuromuscular disorders.
