**Question:** EEG waves are called -

A. Delta waves
B. Theta waves
C. Alpha waves
D. Beta waves

**Correct Answer:**

EEG waves are called **Electroencephalogram waves** and are a measure of brain activity. EEG stands for Electroencephalogram, which is a non-invasive test used to measure and record the electrical activity of the brain. The correct answer is:

**D. Beta waves:**

Beta waves are a type of EEG wave that represents normal, active, and alert brain activity. They typically occur during wakefulness, mental tasks, and are associated with rapid brain activity. Beta waves are part of the normal range of EEG waves and are crucial for understanding brain function and diagnosing neurological disorders.

Option A, Delta waves, represent very slow brain activity and are typically seen in deep sleep or under certain medical conditions like coma or severe brain injury. Option B, Theta waves, are slower than alpha waves and are mostly associated with light sleep or under certain neurological conditions. Option C, Alpha waves, are associated with relaxed wakefulness, eye closure, or drowsiness.

In summary, EEG waves are a crucial tool for understanding brain function and diagnosing neurological disorders. Beta waves represent normal, active, and alert brain activity, while other options (Delta, Theta, and Alpha waves) represent different stages of sleep or neurological conditions.