WAEC 2017/2018 Computer Science (Obj & Essay) Answers – May/June Expo


Wednesday, 12th April, 2017


ENGLISH ANSWERS WILL NEVER BE POSTED HERE TOMORROW. MARK MY WORDS

5a)
10110112
=1*2^6 + 0*2^5 + 1*2^4 + 1*2^3 + 0*2^2 + 1*2^1 + 1*2^0
=1*64 + 0*32 + 1*16 + 1*8 + 0*4 + 1*2 + 1*1
=64 + 0 + 16 + 8 + 0 + 2 + 1
=91
tabulate
16|91
5 r B
O r 5
10110112=5B16
were B is 11

5b)
HACKER: A hack group getting main owner on an XAT chat without authorization.
SCAMMER: Tricking an internet user into giving you his/her login name and password

5c)
i)HTML: Hypertext Markup Language
ii)HTTP: Hypertext Transfer Protocol
iii)ISP: Internet Service Language
iv)SMTP: Simple Mail Transfer Protocol.
================

4a)
complet the table
1)RAM is volatile i.e. its contents are lost when the ddevice is powered off. ROM is non-volatile i.e. its contents are retained even when the device is powered off.
2)RAM allows the computer to read data quickly to run applications. It allows reading and writing.
ROM stores the program required to initially boot the computer. It only allows reading.

4b)
i)Searching and Organizing
ii)Ease of Access Center
iii)Default Programs
iv)Remote Desktop Connection

4c)
i)antivirus programs
ii)registry cleaners
=============

1a)
An input device is any hardware device that sends data to a computer, allowing you to interact with and control the computer.

1b)
i)key board
ii)The mouse

1c)
i) Logic gates are digital components that typically work two levels of voltage and determine how a component conducts electricity.
ii) Logic gates use Boolean equations and switch tables.

1di)
A,B
OR —-)—- A+B
1dii)
and gate
A—- AB
B—- AND
==============

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