Can there be a physical quantity which has no units and no dimensions.

Explanation

To determine if there can be a physical quantity that has no units and no dimensions, we can analyze the concept of angular displacement, denoted as θ (theta).

### Step-by-Step Solution:

1. **Understanding Angular Displacement**:
- Angular displacement (θ) is defined as the angle through which an object has rotated about a fixed point or axis. It is a measure of the change in the angle of an object.

2. **Formula for Angular Displacement**:
...