Page 22 - Viva ICSE Computer Studies 3 : E-book

Quick Recall

• A computer is a smart machine which helps us to do several tasks like typing letters, solving
mathematical problems, making drawings and colouring.

• The two basic components of a computer with the help of which a computer system works are
hardware and software.
• A monitor displays everything we do on a computer. There are three types of monitors:
1. Cathode Ray Monitor (CRT Monitor)

2. Liquid Crystal Display Monitor (LCD Monitor)
3. Light Emitting Diode Monitor (LED Monitor)
• Central Processing Unit (CPU) is the main part of a computer. All the processing work of a
computer occurs here. There are three main parts of a CPU: Memory Unit (MU), Control Unit
(CU) and Arithmetic and Logical Unit (ALU).
• We fi nd diff erent types of keys on the keyboard.

• A mouse helps us to point at or select an object on a computer screen. It usually has two
buttons: left button and right button.
• There are two types of software: system software and application software.
• A computer cannot operate on its own without a system software.

• Word processing software (Word 2016), spreadsheet software (Excel 2016), presentation
software (PowerPoint 2016) and Paint are some examples of application software.
• A computer works on the principle of IPO (Input–Processing–Output) cycle.

A. Fill in the blanks.

1. The two basic parts of a computer with the help of which a computer system works are
______________ and ______________.
2. The ______________, ______________ and ______________ parts are the hardware
of the computer system.

3. ______________ and ______________ are entered in an IPO cycle.

4. Monitor is called the ______________ unit.
5. ______________ monitor is rarely in use now.

B. State whether the following statements are true or false.

1. A monitor looks like a television screen and displays everything we do
on a computer. _________
2. The CPU is the brain of the computer. _________

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