COMPUTER STUDIES QUESTIONS WITH ANSWERS
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.
State four reasons why a mobile phone is regarded as a computer.
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(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
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.
Differentiate between discrete and analog data
Computers can be classified in many ways.
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A computer network is an interconnection of computers that communicate to each other through network media, protocols and communication media devices.
A computer network can be classified as:-
Definition of LAN
A local area network is a computer network that spans a small geographical area such as an office, a building or a compound.
This can be at least a peer-to-peer connection of two computers or a connection of many computers within a restricted small geographical area Components of a Local Area Network
Components of a local area network are requirements that can be used to establish/initiate/build a local area network. These requirements include:-
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Characteristics of Computers That Makes Them Smarter Than Human Beings
1. THEY ARE EFFICIENT
ADVANTAGES OF COMPUTERS
1) Computers process data faster:
2) Computers are more accurate & reliable:
3) Computers are more efficient:
4) Computers can quickly and effectively store & retrieve large amounts of data.
5) They are very economical when saving information, for it can conserve a lot of space.
- First generation computers were very large in size and used thousands of electronic gadgets called vacuum tubes or thermionic valves. They emitted a lot of heat and were difficult to program, use and maintain.
- Second generation computers were smaller in size and used electronic devices called transistors. They produced less heat and were also difficult to program, use and maintain.
- Third generation computers were made of integrated circuits (ICs). They emitted less heat, were smaller in size and easier to program, use and maintain compared to their predecessors.
- Fourth generation computers were made of large scale integrated (LSI) and very large scale integrated (VLSI) circuits. They were characterised by very low emission of heat, were small in size, easy to use and maintain.
- Fifth generation computers are today’s computers that have very high processing power and speeds and are designed to solve complex problems. They are characterized by artificial intelligence, connectivity to the internet, superior hardware and software products and are very small in size.
(a) Name four other such devices.
- Napiers bone .
- Slide rule
- La Pascaline machine
- Weaving loom
(b) Explain how the devices listed in (a) above contributed to the development of modern electronic computers.
![Napier bones](/uploads/6/0/4/0/60406393/published/napier-bones.jpg?1608380512)
Components that may be housed inside the system unit
- Central processing unit (CPU)
- Hard disk
- Drives such as optical and floppy drives
- Main memory
- Power supply unit
- Mother board/ System board
- Internal Speakers
- Cards such as VGA cards, network card or TV cards
- Fans
- Heat Sink
- Data cables such as the ribbon, HDMI, and some other parallel cables
- Power cables
Highlight six peripheral devices that can be connected to a typical computer
- Monitor
A television-like device used for displaying information. - Keyboard
A keying device used to enter data and instructions into a computer. - Mouse
A pointing device that enables the user to execute commands. It is used to control an arrow displayed on the screen. - Speakers
sound output devices used to output sound from the computer. - Printer
An output device used to produce information on a piece of paper (hard copy or print-out) from the computer. - Scanner
An input device used to automatically capture data from source documents or objects.
Using an illustration, explain how a computer operates
- The computer gets input from input devices such as the keyboard.
- The input is then processed in the CPU and is output as information on a device such as the monitor
Differentiate between (a) data and information (b) central processing unit and system unit.
19/12/2020
(a) data and information.
(b) central processing unit (CPU) and system unit.
- A computer can be defined as an electronic device that processes a user’s input (data) to a desired output (information).
- A program refers to a set of instructions that direct a computer on what to do to accomplish a task.
- Peripheral devices are devices that are external to the system unit and are connected to the system through ports.
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