1. **Does the object have a square base?**
   - **Answer:** No
   - **Reasoning:** From the images provided, the base of the object is cylindrical, not square. The images show a consistent circular base in all orientations.

2. **Is there a semi-circle attached to the top of the square?**
   - **Answer:** No
   - **Reasoning:** There is no square to which a semi-circle could be attached. The object features a semi-circle, but it is attached to a cylindrical base, not a square one.

3. **Is the flat side of the semi-circle attached to the top of the square?**
   - **Answer:** No
   - **Reasoning:** As established in the previous answers, there is no square component in the object. The semi-circle is attached with its flat side to the top of a cylindrical base.

4. **Is the entire sketch extruded?**
   - **Answer:** Yes
   - **Reasoning:** The object appears to be a 3D extrusion of a 2D sketch. The consistent thickness across the different parts and the uniformity of the shapes in 3D suggest that the entire sketch has been extruded to form the object.