Computer Studies Waec Answers Objective/essay

Computer Studies 2 (Essay) 3:00pm – 4:00pm
Computer Studies 2 (Objective) 4:00pm – 5:00pm



COMPUTER OBJECTIVES

1-10ACDCBDDCAB
11-20BADDCBBCDB
21-30ABBDABCBCB
31-40BCBAACCCBA
41-50DBDDCBCCDB






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1a) An input device is any hardware device that sends data to a computer, allowing you to interact with and control the computer. The picture shows a Logitech trackball mouse, an example of an input device.
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.




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(3a)
information is an analyzed or processed data, which is now more meaningful and decisions can be made based on its data and information is connected. Communication technology is the activity of designing, constructing and maintaining communication systems. In the modern era it is referred to as ICT. This is information and communications technology, and includes any communication device or application such as radio and television.


(3b)
LAN-local area network

GPS-global postioning Service.

IP-internet protocol




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(4a)

TABULATE THIS: RAM: is the memory available for the operating system, programs and processes to use when the computer is running.

ROM: is the memory that comes with your computer that is pre-written to hold the instructions for booting-up the computer.



RAM:requires a flow of electricity to retain data (e.g. the computer powered on).

ROM:will retain data without the flow of electricity (e.g. when computer is powered off)


(4b)
ii.

+Password-protect
+documents encryption
+Secure wireless transmissions


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HTML =Hypertext Markup Language
HTTP =HyperText Transfer ProtocoL
ISP =Internet service provider
SMTP =Simple Mail Transfer Protocol
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5a)
10110112
=1*2^6+0*2^5+1*2^4+1*2^3+0*2^2+1*2
=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)
TABULATE

HACKER


i) A hack group getting main owner on an XAT chat without authorization.

SCAMNER


ii) Tricking an internet user into giving you his/ her login name and password

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