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Computer Studies KCSE Prediction Questions and Answers

Institution: Secondary

Course: Computer Studies

Content Category: Class Notes

Posted By: stevowab

Document Type: PDF

Number of Pages: 239

Price: KES 80
 
    

Views: 2856     Downloads: 5

Summary

INTRODUCTION TO COMPUTERS
1. (a) Clearly define a computer
- A computer is an electronic device that operates (works) under the control of programs stored in its own memory unit
- An electronic device that accepts data, as input and transforms it under the influence of a set of special instructions called programs, to produce the desired output (referred to as information)

(b) Give one reason why a computer is refered to as an electronic device
- It uses electrical signals to process data
- It is made up of electronic components and uses electric energy to operate

2. Explain the following terms as used in computer science
(i) Data
A collection of raw facts, figures or instructions that do not have much meaning to the user

(ii) Program
A computer program is a set of related instructions which specify how data is to be processed
A set of instructions used to guide a computer through a process


(iii) Data processing
It is the process of collecting all terms of data together & converting them into information

(iv) Information
Data which has been refined summarized & manipulated in the way you want it, or into a more meaningful form for decision- making

3. State any three functions of a computer
- Accepting data
- Processing the data
- Producing information

4. Explain the following input/ output terms as used in computer systems. Give an example for each
(a) Read - To transfer data from an input device to the computer, e.g. the computer
reads data from a disk, a keyboard, etc
- To move or copy data from backing storage to the main
Storage
(b) Write - To transfer information from the computer to an output
Device e.g. the computer writes output on a printer or onto a disk.
- To move or copy data from the main storage to a backing storage

5. State four different parts that make up a computer (2 mks)
- System unit
- Monitor
- Keyboard
- Mouse
- Printer
- Modem
- Scanner
- Speakers
- Graph plotters

6. (a) Explain the term system Unit
This is the casing that houses the internal components of the computer such as the CPU and storage devices
............................


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