Neco 2015 Computer Studies Answers now Available Foя free!!!

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Wednesday 24th June Paper III & II: Objective

& Essay –

Computer Studies – 10:00am –







41-50 BBBEDC-D-A



Neco 2015 Computer Theory

1a) program dubugging is a methodical process of finding

and reducing the number of bugs, or defects, in a computer

program or a piece of electronic hardware, thus making it

behave as expected.

1b) i)Portability: Portability refers to the ability of an

application to run on different platforms (operating systems)

with or without minimal changes.

ii)Readability: The program should be written in such a way

that it makes other programmers or users to follow the logic

of the program without much effort.

iii)Efficiency: Every program requires certain processing

time and memory to process the instructions and data.

iv)Structural: To develop a program, the task must be broken

down into a number of subtasks.

1c) i)Syntax errors: errors due to the fact that the syntax of

the language is not respected

ii)Semantic errors: errors due to an improper use of program


iii) Logical errors: errors due to the fact that the specification

is not respected. (


a ) peripheral device : A peripheral device is

defined as a

computer device, such as a keyboard or

printer, that is not

part of the essential computer ( i .e . , the

memory and micro

processor ) .

b ) system software : System software is a

type of computer

programthat is designed to run a computer’s


and application programs

c ) operator system : system operator is one

who runs the

day – to – day operation of a server and the

term suggests a

person who is available when the system is

d ) translator : Atranslatoris a computer

program that

performs the translation of a program written

in a given

programming languageinto a functionally

equivalentprogram in a different computer


without losing the functional or logical

structure of the

original code ( the ” essence” of each

program ) .


3 a )

– sequential organization: this are records

are stored and accessed in a particular

order sorted using a key field.

– serial organisation: records in a file

arestored one after

another. You need to go first file in order to

reach the



3 b )

The logic or Boolean expression given for a

logic NOR gate

is that for Logical Multiplication which it

performs on the

complements of the inputs. The Boolean

expression for a

logic NOR gate is denoted by a plus sign , ( )

with a line or

Overline, ( ‾‾ ) over the expression to signify

the NOT or

logical negation of the NOR gate giving us the


expression of: A B = Q.

3 ci )

Bus topology is a network setup where each


and network

device are connected to a single cable or

backbone . Bus

networks are useful in small networks ( like

those setup in


small offices ) .

3 cii )

Mesh topology a network setup where each


and network device is interconnected

with one another, allowing for most

transmissions to be distributed , even if

one of the connections go down . This

topology is not commonly used for most


networks as it is difficult and

expensive to have redundant connection

to every computer.

3 ciii )

A ring network is a network topology in which

each node

connects to exactly two

other nodes , forming a single continuous

pathway for signals through each node – a

ring . Data travel from node to node , with

each node along the way handling every

packet . Rings can be unidirectional , with all

traffic travelling either clockwise or

anticlockwise around the ring , or

bidirectional ( as in SONET / SDH ) .


4 a )

Ping is a basic Internet program that allows a

user to

verify that a particular IP address exists and

can accept

requests . In Other Words Ping works by

sending an

Internet Control Message Protocol ( ICMP )

Echo Request to

a specified interface on the network and

waiting for a

reply .

4 b ) packet is the unit of data that is routed

between an

origin and a destination on the Internet or

any other

packet – switched network. In Other Words

When any file ( e –

mail message , HTML file , Graphics

Interchange Format file,

Uniform Resource Locator request, and so

forth) is sent

from one place to another on the Internet.

4 c) Website is a related collection of World

Wide Web

( WWW ) files that includes a beginning file

called a home

page . In Other Words From the home page ,

you can get to

all the other pages on their site. For example

, the Web site

for IBM has the home page address of http

:/ /

www . ibm . com . ( The home page address

actually includes

a specific file name like index. html but , as

in IBM’s case ,

when a standard default name is set up ,

users don ‘ t have

to enter the file name . )

IBM’s home page address leads to thousands

of pages .

( But a Web site can also be just a few pages

. )

4 d )

home page or index page is the initial or

main web page of

a website. It is sometimes also called the

front page or

main page ( by analogy with newspapers ) ,

or written as

“homepage . ”

For example , a news website may present

the headlines

and first paragraphs of top stories, with links

to the full

articles , in a dynamic web page that reflects

the popularity

and recentness of stories.

4 e) Gopher is an application- layer protocol

that provides

the ability to extract and view Web

documents stored on

remote Web servers . In Other Words Gopher

was conceived in 1991 as one of the Internet’s

first data / file

access protocols to run on top of a TCP/ IP

network . It

was developed at University of Minnesota

and is named

after the school ‘s mascot.

4f) system administrator, or sysadmin , is a

person who is

responsible for the upkeep , configuration ,

and reliable

operation of computer systems ; especially

multi – user

computers , such as servers.

The system administrator seeks to ensure

that the uptime ,

performance, resources , and security of the

computers he

or she manages meet the needs of the users

, without

exceeding the budget.


Some smart guys refreshed it as many times as possible so that they can see the answers, which they have seen, since yesterday.



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