Q1 : What is the difference between computerised and non-computerised transactions in banking system.
Q2 : State the need for intellectual property laws.
A2 : Intellectual property laws are of need to establish and safeguard the intellectual property which refers to work created by inventors, authors and artists.
Q3 : List of effects of controversial contents on society.
(i) Pornography. (ii) Slander.
A3 :
(i) Pornography.
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(ii) Slander
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* Leads to criminal acts such as exploitation of women and children.
* Leads to sexual addiction or perversion.
* Develops low moral value towards other men, women or even children.
* Could erode good religious, cultural and social beliefs and behaviour.
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* Develops a society that disregards honesty and truth.
* Develops bad habit of spreading untruths and rumors.
* Leads to unnecessary argument.
*Causes people to have negative attitudes towards another person.
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Q4 : Define Computer Security.
A4 : Computer security means protecting our computer systems and the information they contain against unwanted access, damage, destruction, or modification.
Q5 : Define computer systems.
A5 : A computer system is defined as combination of components designed to process data and store files. A computer system consists of four major hardware components; input devices, output devices, processor and storage devices.
Q6 : State the meaning of input, process, output and storage.
A6 :
Input is any data or instructions that we enter into the computer system for processing. There are four types of input: which are text, graphic, audio and video. Example of input devices are keyboard, light pen, joystick, microphone, mouse, video & digital camera.
Process.
The processing unit controls all activities within the system. The CPU is an example of a processor. It has the same importance as the brain to human being.
Storage is a location which data, instruction and information are held for future use. It is the physical material that keeps keeps data, instruction and information. There are two types of storage. They are the primary storage and secondary storage. The example of storage devices are hardisk, Floppy Disk, diskette, RAM, CD ROM and DVD ROM.
Output is data that has been processed into a useful form, called information. There are four types of output, which are texts, graphics, audio and video. Example of output devices are monitor, printer, speaker and plotter.
Q7 : Explain the function of ASCII
A7 : ASCII stands for American Standard Code for Information
Interchange & was proposed by ASA in 1963 & was finalized in 1968.
ASCII is standard of 7-bit code used to represent characters, which include letters, numbers & punctuation marks. ASCII was established to achieve compatibility between various types of data processing equipment making it possible for the components to communicate with each other successfully.
ASCII enables manufacturers to produce component that are assured to operate correctly in a computer.
ASCII makes it possible for humans to interact with a computer. It also enables users to purchase components that are compatible with their computer configurations.
Q8 : State the units of data measurement :
i.) Bit, ii.) Byte, iii.) Kilobyte (KB), iv.) Megabyte (MB), v.) Gigabyte (GB) and vi.) Terabyte (TB).
A8 :
i.) A bit is a binary digit, the smallest increment of data on a computer. A bit can hold only one of two values: 0 or 1, corresponding to the electrical values of off or on, respectively.
ii.) Bits are usually assembled into a group of eight to form a byte. A byte contains enough information to store a single ASCII character, like "h".
iii.) A kilobyte (KB) is 1,024 bytes, not one thousand bytes as might be expected, because computers use binary (base two) math, instead of a decimal (base ten) system.
iv.) 1 MB is 1,024 kilobytes, or 1,048,576 (1024x1024) bytes, not one million bytes.
v.) 1 GB is 1,024 MB, or 1,073,741,824 (1024x1024x1024) bytes.
vi.) A terabyte (TB) is 1,024 GB; 1 TB is about the same amount of information as all of the books in a large library, or roughly 1,610 CDs worth of data.
Q9 : State the units of clock speed measurement: i. Megahertz (MHz), ii. Gigahertz (GHz).
A9 :
(i). Megahertz (MHz) equals to one million cycles of the system clock.
(ii). Gigahertz (GHz) equals to one billion cycles of the system clock.
Q 10 : Identify the output devices used for text, graphic, audio and video.
A 10 : A monitor is an example of an output device that can be used to display text. It can also display graphics and video. It accepts video signals from a computer and displays information on its screen. A printer is another example of an output device that can be used to print text, apart from graphics, on mediums such as paper, transparency film or even cloths. A photo printer is a color printer that produces photo-lab-quality pictures.
An image setter produces high quality output compared to an ordinary laser printer. An image setter is a high resolution output device that can transfer electronic text and graphics directly to film, plates, or photo-sensitive paper.
A pair of speakers is an audio output device that generates sound. The headphone is a pair of small speakers placed over the ears and plugged into a port on the sound card. A woofer or subwoofer is used to boost the low bass sound and is connected to the port on the sound card.
A Liquid Crystal Display (LCD) projector uses its own light source to project what is displayed on the computer on a wall or projection screen. A digital light processing (DLP) projector uses tiny mirrors to reflect light which can be seen clearly in a well-lit room.
Q11 : State the various types of OS used on different platforms.
A11 : PC Platform Operating Systems
The examples of operating systems used on PC platforms or IBM compatible computers are:
· Disk Operating System (DOS)
· Microsoft Windows XP
DOS used a command line interface when Microsoft first developed it. Microsoft Windows XP’s operating environment is a Graphical User Interface (GUI). Both are closed source software.
Apple Platform Operating Systems
The operating systems used on Apple platforms are Mac OS & Mac OS X.
Mac OS was the first commercially successful graphical user interface. It is a closed source software and are targeted for use with home desktops and workstations.
Mac OS X is a multitasking operating system and targeted for use with home desktops, workstations and servers. It also has better security protection compared to Mac OS, for example the integrated firewall utility.
Cross-Platform Operating Systems
Cross-platforms operating systems are:
· UNIX
· LINUX
UNIX is a multitasking operating system. Some versions of UNIX have a command line interface but most versions of UNIX offer a graphical user interface.
Linux is a popular, free, UNIX-like graphical user interface operating system. It is an open source software. Linux provides a great deal of liberty to those that interact with Linux technology. Although Linux runs on many kinds of equipment, it is best known for its support of IBM-Intel PC-based hardware.
Q12: State the function of OS.
A12 : The main functions of OS are
u starting a computer
u providing a user interface
u managing data & program
u managing memory
u configuring devices
