NECO 2022 COMPUTER SCIENCE ( Obj & Essay) Question & Answers – Verified EXPO

 

COMPUTER STUDIES
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51-60: ECDEACCEED

1a

NO 1B

(Choose Any Four)

(i) Head: This is also known as the body. It carries the optical parts in the upper part of the microscope.

(ii) Base: It acts as microscopes support. It also carries microscopic illuminators.

(iii) Arms: This is the part connecting the base and to the head and the eyepiece tube to the base of the microscope. It gives support to the head of the microscope and it is also used when carrying the microscope

(iv) Eyepiece also known as the ocular. This is the part used to look through the microscope. Its found at the top of the microscope. Its standard magnification is 10x with an optional eyepiece having magnifications from 5X to 30X.

(v) Eyepiece tube: It’s the eyepiece holder. It carries the eyepiece just above the objective lens. In some microscopes such as the binoculars, the eyepiece tube is flexible and can be rotated for maximum visualization, for variance in distance. For monocular microscopes, they are none flexible.

(vi) Objective lenses: These are the major lenses used for specimen visualization. They have a magnification power of 40x-100X. There are about 1- 4 objective lenses placed on one microscope, in that some are rare facing and others face forward. Each lens has its own magnification power.

(vii) Nose piece: Also known as the revolving turret It holds the objective lenses. It is movable hence it cal revolve the objective lenses depending on the magnification power of the lens.

(viii) The Adjustment knobs: These are knobs that are used to focus the microscope. There are two types of adjustment knobs i.e fine adjustment knobs and coarse adjustment knobs.

(ix) Stage: This is the section in which the specimen is placed for viewing. They have stage clips that hold the specimen slides in place. The most common stage is the mechanical stage, which allows the control of the slides by moving the slides using the mechanical knobs on the stage instead of moving them manually.

(x) Aperture: This is a hole on the microscope stage, through which the transmitted light from the source reaches the stage.

2AI

(2ai)
E mail service is a means of sending message,text and computer files between computers via the internet. Email is the exchange of computer stores messages by telecommunications. Email service provider (ESP) allows users to send email campaigns to a list of subscribers.

2AII

(2aii)
(Pick Any Three)

(i) managing email is easy
(ii) Email is fast
(iii) Email is inexpensive
(iv) Email is easy to filter
(v) Email Transmission is secure and Reliable

(2bi)
Broadcasting is the distribution of audio and video content to a dispersed audience via any audio or visual mass communications medium, but usually one using electromagnetic radiation (radio waves). The receiving parties may include the general public or a relatively large subset thereof. Broadcasting has been used for purposes of private recreation, non commercial exchange of messages,experimentation ,self training and emergency communication.

2BII

(2bii)
(Pick Any Three)

(i) Personal Area Network (PAN)
(ii) Metropolitan Area Network (MAN)
(iii) Local Area Network (LAN)
(iv) Wide Area Network (WAN)

NO 3I

( 3i)
Bandwidth: Bandwidth is the capacity of data that can be transferred between the website, its users and the servers. It is the capacity of the connection between the website user and the server. Bandwidths are either expressed in MB/s (Megabytes per Second) or GB/s (Gigabytes per Second).

3II

(3ii)
Bookmark : Bookmark is a Web browser feature used to save a Uniform Resource Locator(URL) address for future reference. Bookmarks save user and browser time, which is especially useful for Web pages with long Uniform Resource Locator(URLs).Browsers usually provide folder options for related bookmarks

3III

(3iii)
Download: Download means to receive data from a remote system, typically a server such as a web server, an FTP server, an email server, or other similar system. Download can refer to the general transfer of a file from one computer to another over a network,usually from a larger server to a user device.

3IV

(3iv)
HTML: HTML stands for HyperText Markup Language. It is a standard markup language for web page creation. It allows the creation and structure of sections, paragraphs, and links using HTML elements (the building blocks of a web page) such as tags and attributes.

3IV

(3v)
Hyperlink: Hyperlink is an element in an HTML document that links to either another portion of the document or to another document altogether. On webpages, hyperlinks are usually colored purple or blue and are sometimes underlined.

4A

4a)
i)Hotspot: A hotspot is a physical location where people can access the Internet, typically using Wi-Fi, via a wireless local area network (WLAN) with a router connected to an Internet service provider.

4AII

4aii)
i)Meaningful identifiers:Identifiers are names for entities in a program, such as variables, arrays, functions, data definitions, labels, etc.
ii)Consistent indentation:Correct use of identifiers, white space, and documentation makes your program easier to understand.
iii)File and folder structure:We should avoid writing all of our code in one or two files.
iv)Comments:Comments are invaluable in helping the next person who reads your code figure out what you were thinking when you wrote it, even when that person is yourself a month from now

4B

4b)
ADVANTAGES
i)Selectivity: Radio offers a serious level of selectivity through geographic inclusion by countless stations and different program designs.
ii)Cost-effectiveness: Cost benefits are very huge with radio as a publicizing medium.
iii)Adaptability: Among every one of the media, likely radio is the most adaptable as it has a short shutting period.
DISADVANTAGES
i)Absence of a Visual Element: The most major issue related to radio is the absence of a visual component.
ii)Crowd Fragmentation: A large number of radio broadcasts make crowd fracture.
iii)Clustered: With the expanding force of promoting, the mess has turned into an issue in publicizing media, and radio is no exemption.

NO 5A

5a)
i)A light pen is a light-sensitive computer input device, basically a stylus, that is used to select text, draw pictures and interact with user interface elements on a computer screen or monitor.
ii)A barcode reader (or barcode scanner) is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer.
iii)A plotter is a printer that interprets commands from a computer to make line drawings on paper with one or more automated pens.
iv)Speaker is an output hardware device that connects to a computer to generate sound.

NO 6AI

(6ai)
System software is a type of computer program that is designed to run a computer’s hardware and application programs.

6AII

(6aii)
(i) System software runs when the system is turned on and stop when the system is turned off. WHILE Application Program runs as per the user’s request.
(ii) Example of System software is operating system WHILE That of Application software are Photoshop, VLC player etc.
(iii) System software is meant to administer the system resources. WHILE application Program is meant to enable the user to carry out some specific set of tasks or functions.

6BI

(6bi)
{CHOOSE ANY TWO}
(i) The CPU is responsible for all data processing operations.
(ii) It saves information such as data, intermediate results, and instructions (program).
(iii) It directs the operation of all computer components.
(iv) Controlling all other parts of the machine and sending timing signals.
(v) Transferring data between memory and I/O devices.
(vi) Fetching data and instructions from memory.
(vii) Performing arithmetical and logical operations.
(viii) Executing programs stored in memory.

(6bii)
{CHOOSE ANY TWO}
(i) control unit (CU)
(ii) arithmetic logic unit (ALU)
(iii) registers.
(iv) cache.
(v) buses.

6BII

(6biii)
{CHOOSE ANY FOUR}
(i) HDMI cable
(ii) VGA cable
(iii) DVI cable
(iv) Ethernet Cable
(v) PS/2 Cable
(vi) 5mm Audio Cable

-EXPLANATION-
{CHOOSE ANY TWO AND EXPLAIN}
(i) HDMI cable: HDMI (High definition Media Interface) is a type of computer cable used to transmit high definition video and audio signals. Using the HDMI cables, the audio and video signal can be easily transmitted without compromising the quality of images and can send crystal clear images using this cable.
(ii) VGA cable: VGA (Video Graphics Ray) cable is another type of computer cable which is used for sending video signals and is used to link the monitor and the CPU of a computer. The VGA cable can also be used in HD televisions. All the information displayed on the monitor is coming from the VGA cable. There is a total of 15 pins in the plugin the cable, which have three rows containing 5 pins each. And the cable is easily fitted in the monitor and the other end is fixed in the CPU of a computer system.
(iii) DVI cable: DVI cables are used to connect the LCD monitor and the video card. Using this cable, the user can see high image quality without having any disturbance. The DVI cable is mostly used in CRT monitors, which have a VGA connection. This cable transmits the digital and analog signals to the computer system.
(iv) Ethernet Cable: The Ethernet cable is a type of computer network cable which is used for a wired network. The Ethernet cable is used to connect the switches, monitors, PCs to the LAN (Local Area Network). The length and durability of the Ethernet cable describe the quality of the connection.
(v) PS/2 Cable: The PS/2 cable is a standard cable to connect the mouse and keyboard to the computer system. The length of the PS/2 cable is long enough so that the user can easily connect the mouse and keyboard to the system and use the system. There are a total of 6 pins in PS/2 cables and have a round connector. There are majorly two sizes of PS/2 cable. The smaller size is the most common cable, but some adaptors can be used to convert it into a larger size.
(vi) 5mm Audio Cable: The 3.5mm audio cables are a type of computer cables that are used in computer audio applications. This cable can be used for connecting a mini-stereo audio device, PC sound card or any portable CD player to any multimedia speaker. This cable can also be used to connect earphones and headphones to the system.