1- Which of the below is not output unit?

Scanner

LCD Monitor

Projector

Microphone

Printers

2- The first Personal Computer (PC) was made on the year ____.

A. 1990

B. 1981

C. 1984

D. 1970

3- The User interface used in DOS operating system is _______.

A. Graphical User Interface (GUI)

B. Menu Driven

C. Command Line Interface

4- Data Transfer Rate measurement unit is:

Bit per second

Byte

Hz