Question

Match the LIST-I (EEG Signals) with LIST-II (Frequency): 
\[ \begin{array}{|l|l|} \hline \textbf{LIST I (EEG Signals)} & \textbf{LIST II (Frequency)} \\ \hline A. \ \text{Alpha (} \alpha \text{)} & I. \ \text{0.5 - 4 Hz} \\ B. \ \text{Gamma (} \gamma \text{)} & II. \ \text{4 - 8 Hz} \\ C. \ \text{Delta (} \delta \text{)} & III. \ \text{8 - 13 Hz} \\ D. \ \text{Theta (} \theta \text{)} & IV. \ \text{22 - 30 Hz} \\ \hline \end{array} \]
Choose the correct answer from the options given below: 
 

• A. A - III, B - IV, C - I, D - II
• B. A - I, B - II, C - III, D - IV
• C. A - IV, B - III, C - II, D - I
• D. A - II, B - I, C - IV, D - III

Hint:

EEG waves: Delta = deep sleep, Theta = drowsy, Alpha = relaxed, Gamma = active thought.

Answer 1

The Correct Option is A

Step 1: Recall EEG wave frequency ranges.
- Alpha ($\alpha$) waves: 8–13 Hz, seen in relaxed state with eyes closed.
- Gamma ($\gamma$) waves: 22–30 Hz, associated with higher mental activity and problem solving.
- Delta ($\delta$) waves: 0.5–4 Hz, dominant during deep sleep.
- Theta ($\theta$) waves: 4–8 Hz, associated with drowsiness and meditation.
Step 2: Match correctly.
A → III, B → IV, C → I, D → II.
Step 3: Verify options.
Option (A) matches correctly.
Step 4: Conclusion.
Hence, Alpha = 8–13 Hz, Gamma = 22–30 Hz, Delta = 0.5–4 Hz, Theta = 4–8 Hz.