Computer studies analysis of questions and answers

State three characteristics of mainframe computers.

14/1/2021

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State three characteristics of mainframe computers.

Characteristics of mainframe

They have bigger memory capacity.
Have high processing power.
It supports multiprocessing.
Supports large number of users at the same time/ Supports several peripheral devices.
Runs so many applications at the same time.

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State three features of fifth generation computers.

14/1/2021

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State three features of fifth generation computers.

Features of fifth generation computers

Use of expert system .
Support the use of natural language
Support distributed computing
Support artificial intelligence and voice recognition.
Support parallel processing
Small in size? portable
Superior hardware and software
consume less power

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State the hardware technological differences between the second generation and the third generation computers

11/1/2021

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State the hardware technological differences between the second generation and the third generation computers. (2 marks)

Second Generation Computers

Low memory
Less powerful processing speed
Used transistors to process

Third generation computers

Larger memory
More powerful processing speed
Used integrated circuits to process

the honeywell 200 was an example of 2nd generation computer

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State two advantages of using portable computers.

7/1/2021

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State two advantages of using portable computers.

Advantages of portable computers

They have battery that powers the devices hence can be used when where is no power.
They can be used anywhere because they are light.
They require less space.
Technology must be qualifìed.

State two advantages of using portable computers.

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Differentiate between analogue data and digital data as used in computers.

7/1/2021

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Differentiate between analogue data and digital data as used in computers. (2 marks)

Analogue data Uses values that change continuously between to instances while Digital data are values that change from one value to the next in a step by step sequence.

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State two reasons for the increased use of laptop computers in government offices

4/1/2021

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State two reasons for the increased use of laptop computers in government offices. (2 marks)

Reasons for the preference for laptops.

They are small and fit in a small storage space.
They are light weight hence can be carried to areas where their services are required.
The monitor, system unit, keyboard units are attached together hence making its use to be convenient.
Rechargeable / backup battery.

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Describe each of the following types of computers: hybrid; and embedded.

31/12/2020

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Describe each of the following types of computers: hybrid; and embedded.

(a) Hybrid -computer is one that has both analogue and digital features.
(b) Embedded -computer is one that is within some other device such as domestic appliances, petrol pumps etc. A computer attached to another machine.

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What is a computer keyboard?

30/12/2020

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(a) (i) What is a computer keyboard? (1mk)

Input device with keys for keying in data in the form of characters

List four types of keys found on a computer keyboard. Give an example of each. (4mks)

Alphanumeric
Function
Numeric key pad
Special character
Cursor control

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List three differences between a microcomputer and a super computer

30/12/2020

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List three differences between a microcomputer and a super computer (3mks)

Microcomputers

Small in size
Low speed compared to Supercomputers
Intended for use at home or Offices
Low cost compared to supercomputers

Supercomputers

Huge in size
Fast processing capacity
Mainly used in scientific and application engineering application e.g. Like weather forecasting
Very expensive

supercomputer

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Define authenticity as used in software selection

29/12/2020

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Define authenticity as used in software selection

This refers to the gem4ineness/originality/licensed software. Software that is not pirated.
The software is not counterfeit and customers are able to confirm that they have the real thing. Software integrity, authenticity and security together form a sound basis for confidence that software is free from intentional and unintentional vulnerabilities and that the software functions as intended.https://safecode.org

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Explain why smart phones and personal digital assistants (PDAs) may be regarded as personal computers.

20/12/2020

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Explain why smart phones and personal digital assistants (PDAs) may be regarded as personal computers.

PDAs and smart phones are powered by microprocessors, which coordinate all of the functions according to programmed instructions just like all other personal computers.

they are programmable.
they are an electronic devices.
they can process data into information i.e. input, process and output.
they can store information and transmit it.
they have a CPU

State four reasons why a mobile phone is regarded as a computer.

Smartphones are examples of personal digital assistants (PDAs)

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Current shifts in technology indicate a shift from analog to digital, State four advantages of digital technology over analog technology

20/12/2020

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(a) List four devices which though traditionally analog, have evolved to digital systems.

Television sets
Cameras
Watches
Radio
Phonograph
Telephone

Phonograph

(b) State four advantages of digital technology over analog technology.

Digital devices are simpler to develop than analog devices.
Digital devices are more accurate and precise compared to analog devices.
Digital devices are smaller in size as compared to analog devices of the same functionality.
Digital devices use less power than the analog devices.

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Distinguish between general and special purpose computers

20/12/2020

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Distinguish between general and special purpose computers

General purpose computers are designed to be able to perform variety of tasks when loaded with appropriate programs, while special purpose computers are designed to accomplish a single task.

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Using illustrations, differentiate between discrete and analog data.

20/12/2020

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Differentiate between discrete and analog data

Discrete data is a type of data that is non-continuous in nature such as data in binary form. Discrete data is usually represented using a square waveform.
Analog data, on the other hand, is data that is continuous in nature such as speed, temperature, volume and weight. Analog data signals are usually represented using a continuous sinusoidal waveform.

waveform of digital data

waveform of analogue data

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Computers can be classified in many ways. List the three common classification modes

20/12/2020

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Computers can be classified in many ways.
a) List the three common classification modes

Physical size
Functionality
Purpose

ATM Machine can be both digital, special purpose computer and microcomputer.

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DIFFERENCES BETWEEN DIGITAL AND ANALOGUE DATA AND COMPUTERS

16/10/2019

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DIFFERENCES BETWEEN DIGITAL AND ANALOGUE DATA AND COMPUTERS

#	ANALOGUE	DIGITAL
1	analogue data is continuous in nature (continuous data is quantitative data that can be measured. • it has an infinite number of possible values within. a selected range e.g. temperature range.)	digital data is discrete in nature (discrete data is quantitative data that can be counted, Discrete data is based on counts. Only a finite number of values is possible, and the values cannot be subdivided meaningfully.)
2	less accurate	more accurate
3	more affected by other factors	less affected by other factors
4	requires complex programs to run	requires simple programs to run
	Famous examples of analog computers are the Planimeter, the nomogram, operational amplifiers, mechanical integrators, slide rules, tide predictors, electric integrators that solve partial differential equations, electronic machines that solve ordinary differential equations, machines to solve algebraic equations, the Norden bomb sight, and neural networks.	All modern computers, laptops, and calculators are all digital computers.

Digital Computer

Analogue Computer

DIFFERENCES BETWEEN MICRO-COMPUTERS AND MAINFRAME COMPUTERS

16/10/2019

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DIFFERENCES BETWEEN MICRO-COMPUTERS AND MAINFRAME COMPUTERS

#	MAINFRAME COMPUTER	MICRO-COMPUTERS
1	large in size	small in size
2	not portable	portable
3	more powerful processing speeds	less powerful processing speeds
4	ability to multi-task, multi-process numerous tasks	can process limited tasks
5	uses a number of processors	uses only one processor

Atika School Provides Computer studies questions and answers for KCSE preparations and Computer Science for CBC.

State three characteristics of mainframe computers.

State three features of fifth generation computers.

​State the hardware technological differences between the second generation and the third generation computers. (2 marks)

Second Generation Computers

Third generation computers

State two advantages of using portable computers.

​Differentiate between analogue data and digital data as used in computers. (2 marks)

​State two reasons for the increased use of laptop computers in government offices. (2 marks)

Describe each of the following types of computers: hybrid; and embedded.

​(a) (i) What is a computer keyboard? (1mk)

​List four types of keys found on a computer keyboard. Give an example of each. (4mks)

​List three differences between a microcomputer and a super computer (3mks)

​Microcomputers

​Supercomputers

Define authenticity as used in software selection

​Explain why smart phones and personal digital assistants (PDAs) may be regarded as personal computers.

State four reasons why a mobile phone is regarded as a computer.

​(a) List four devices which though traditionally analog, have evolved to digital systems.

(b) State four advantages of digital technology over analog technology.

​Distinguish between general and special purpose computers

Differentiate between discrete and analog data

Computers can be classified in many ways. ​a) List the three common classification modes

DIFFERENCES BETWEEN DIGITAL AND ANALOGUE DATA AND COMPUTERS

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DIFFERENCES BETWEEN MICRO-COMPUTERS AND MAINFRAME COMPUTERS

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State the hardware technological differences between the second generation and the third generation computers. (2 marks)

Differentiate between analogue data and digital data as used in computers. (2 marks)

State two reasons for the increased use of laptop computers in government offices. (2 marks)

(a) (i) What is a computer keyboard? (1mk)

List four types of keys found on a computer keyboard. Give an example of each. (4mks)

List three differences between a microcomputer and a super computer (3mks)

Microcomputers

Supercomputers

Explain why smart phones and personal digital assistants (PDAs) may be regarded as personal computers.

(a) List four devices which though traditionally analog, have evolved to digital systems.

Distinguish between general and special purpose computers

Computers can be classified in many ways.
a) List the three common classification modes