This will depend upon your OS.
In Win7, the Microsoft key (between Control and Alt) and the + (actually the =, as shift is not required) key magnifies in 100% (or other preset) increments, and Microsoft and - demagnifies.
Which document screen feature is used to set margins and tab
grid or rule
print preview
The Ruler.
The ribbon.
I would say the Quick Access bar
Split screen view allows you to see two parts of the same document at the same time, typically by dividing the screen horizontally or vertically. This feature is useful for comparing or referencing different sections of the document simultaneously.
read mode
Save document screen
An oscilloscope is a device that magnifies changes in electrical signals, displaying them as a graph on a screen. It is commonly used in electronics to visualize and analyze electronic signals.
Document window
touch screen