Waec 2017 Computer Essay and Obj, Theory and Objectives Answers/Expo

COMPUTER STUDIES OBJ ANSWERS NOW POSTED 
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Comp Obj
1-10ACDCBDDCAB
11-20BADDCBBCDB
21-30ABBDABCBCB
31-40BCBAACCCBA
41-50DBDDCBCCDB

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

1a) Input device are devices by which data, information and instructions into the computer system

1b) keyboard
ii) light pen
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.
======================[
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

 (3b)
LAN-local area network
GPS-global postioning Service.
IP-internet protocol

==========================

 (4a)TABULATE
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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