题目内容

Which of the following is the component of CPU?

ALU
B. hard disk
C. memory
D. mouse

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Which is an input device as follows ?( )

A. speaker
B. printer.
C. scanner
D. monitor

Digital computer uses ( ) number system.

A. binary
B. decimal
C. octal
D. hexadecimal

( (____)) is the heart of a computer system.

A. Memory
B. Hard disk
CPU
D. Keyboard

Some keys on keyboard have two characters. When we want to get the upper character we should hold () and press the key.

A. Ctrl
B. Shift
C. Alt
D. any of the above