COMPUTER OBJ AND THEORY

WAEC Computer Science Answers 2019.

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COMPUTER OBJECTIVES:
1-10 - DCABBAACCD
11-20 - CBADCCAADA
21-30 - BBDAACABBA
31-40 - DDCBCCADCB

41-50 - ABBDACCAAD

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Computer solutions
WAEC RUNZ DONE
(1a)
firewall is a system designed to prevent
unauthorized access to or from a private network.
In other word You can implement a firewall in
either hardware or software form, or a
combination of both.
(1aii)
(i)If you are using Windows XP, always turn on
the firewall.
(ii)Always run all necessary latest updates &
service packs (all windows! including all your
programs & software!—keep them updated)
(1b)
(i)feasibility study- this extent to which the
required software performs a series of steps to
solve business problems and user requirements.
This feasibility is dependent on human resources
(software development team) and involves
visualizing whether the software will operate after
it is developed and be operative once it is
installed.
(ii) Design – The prerequisite for this phase is the
requirement specification document. In this
phase, the system and software design are
prepared based on the given requirements. The
system design helps in specifying hardware and
software requirements and overall defines the
system architecture.
(iii) Maintenance –Problems arises once the
customers start using the product. These
problems need to be fixed from time to time. This
is what is covered in the maintenance phase. The
service engineers oblige the customers by solving
the issue.
1bii System Design: This third phase describes, in
details, the necessary specifications, features and
operations that will satisfy the functional
requirements of the proposed system which will
be in place
(1a)
A firewall is software used to maintain the
security of a private network. Firewalls block
unauthorized access to or from.
(1b)
1aii.
1) By installing anti-virus on the computer system
2) proper cleaning and positioning should be done
after using the computer system
*3a*
i) A storage device is any computing hardware
that is used for storing, porting and extracting
data files and objects. It can hold and store
information both temporarily and permanently,
and can be internal or external to a computer,
server or any similar computing device.
ii) A virtual memory is a memory that appears to
exist as main storage although most of it is
supported by data held in secondary storage,
transfer between the two being made
automatically as required.
(2a)
(i) Add all basic details to every song (ie tag) :
title, artist, album name, album artist, track
number, year, genre
(ii) Add artwork for every track
(iii) Add lyrics for every track
(iv) Add genre category to each track
(2b)
(i) Copy
(ii) Move
(2c)
(i) file: is a computer resource for recording data
discretely in a computer storage device. In other
words Just as words can be written to paper, so
can information be written to a computer file. Files
can be edited and transferred through the internet
(ii) record: is a collection of fields, possibly of
different data types, typically in fixed number and
sequence.
(3ai)
A storage device is any computing hardware that
is used for storing, porting and extracting data
files and objects. It can hold and store
information both temporarily and permanently,
and can be internal or external to a computer,
server or any similar computing device.
(3aii)
Virtual memory is a memory management
capability of an operating system (OS) that uses
hardware and software to allow a computer to
compensate for physical memory shortages by
temporarily transferring data from random access
memory (RAM) to disk storage.
(3bi)
For 2kb
1 byte = 8 bits.
1 Kilobyte = 8 x 10³ Bits.
1 Kilobyte = 8 x 1000 Bits.
1 KB = 8000 bits.
.:. 2kb = 8000 x 2 = 16,000bits
For 2mb
1mb = 1000kb
.:. 2mb = 2000kb
Where 1kb = 8000 bits,
Then to find 2000kb in bits
= 8000 x 2000
=16,000,000 bits
(3bii)
The total storage of the two devices in bits =
16,000 + 16,000,000
= 16,016,000 bits
.:. Changing to bytes
= 8 bits = 1 byte
.:. 16,016,000 bits = ?
= 2,002,000 bytes
4.bii
Characteristics of Computer
SPEED : In general, no human being can
compete to solving the complex computation,
faster than computer.
ACCURACY : Since Computer is programmed, so
what ever input we give it gives result with
accuratly.
STORAGE : Computer can store mass storage of
data with appropriate formate.
DILIGENCE : Computer can work for hours
without any break and creating error.
VERSATILITY : We can use computer to perform
completely different type of work at the same
time.
POWER OF REMEMBERING : It can remember
data for us.
NO IQ : Computer does not work without
5a)
encryption is the process of encoding a message
or information in such a way that only authorized
parties can access it and those who are not
authorized cannot. Encryption does not itself
prevent interference, but denies the intelligible
content to a would-be interceptor.

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