Question

A circular revolving unit that is set into the floor, and which can turn mechanically to bring one set into view as another disappears, is a

1) wagon.

2) treadmill.

3) turntable.

4) trapdoor.

Answer 1

A turntable is a circular revolving unit that can rotate to bring one set into view while another set disappears.

Step-by-step explanation:

The circular revolving unit described in the question is a turntable. A turntable is a device that can rotate to bring one set into view while another set disappears. It is commonly used in various applications, such as record players and rotating platforms in manufacturing processes.