Waec 2019 Computer Studies Theory and Obj Answers – May/June Expo_

Waec 2019  Computer Studies Theory and Obj Answers – May/June Expo_

Waec 2019  Computer Studies Theory and Obj Answers – May/June Expo_




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_Waec 2019  Computer Studies Theory and Obj Answers – May/June Expo_

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COMPUTER OBJ
1-10: ADBBBDBDBB
11-20: CADCBCDCAD
21-30: BBDDACCAAA
31-40: DADAAACDAC
41-50: BACDAACADA

Computer solutions
From 1 to 5

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(1a)
A firewall is software used to maintain the security of a private network. Firewalls block unauthorized access to or from.

(1aii)

(1)Obstacle to the alleged intruder through physical and software means.

(2)Management or influence on the elements of a  system.



 (1aiii)


1aii.

1) By installing anti-virus on the computer system

2) proper cleaning and positioning should be done after using the computer system

*1b*

i) The feasibility study is basically the test of the proposed system in the light of its workability, meeting user's requirements, effective use of resources and of course, the cost effectiveness. These are categorized as technical, operational, economic, schedule and social feasibility.

ii) The design phase comes after a good understanding of customer’s requirements, this phase defines the elements of a system, the components, the security level, modules, architecture and the different interfaces and type of data that goes through the system.
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(2ci)

*File*

A file is an object on a computer that stores data, information, settings, or commands used with a computer program


(2cii)

*Record*

In computer, a record (also called a structure, struct, or compound data) is a database entry that may contain one or more values.
==============
*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.
4ii)
 Portability

Readability

Efficiency

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.



(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

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