2018/2019 WAEC computer science expo questions and answers runz may June

2019 WAEC Data Processing Answers/Runz

2018/2019 WAEC computer science expo2018/2019 WAEC computer science expo

VERIFIED COMPUTER OBJ

1-10 AAAAACBACD

11-20 CCBDCDCAAD

21-30 DAAAACCDDC

31-40 BDBAADCACA

41-50 DAAABADDBA

1ai)

Computer system is a connection of electro-mechanical devices that link together forming a system inorder to perform automatic data processing (EDP)using software

1aii)

Major Component of computer

i)Central processing unit(CPU)

ii)Input unit

iii)Output unit

iv)storage unit

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1bi)

i)Collection

ii)conversion

iii)Manipulation

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

(1bii)

i)EDSAC:

Electronic Delay storage Automatic Calculator

ii)EDVAC:

Electronic discrete Variable Automatic computer

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

(2a)

What is Register?

Register is one of  a small set of data holding places that are part of a computer processor. it hold computer instruction , a storage address , or any kind of data (such as a bit sequence or individual character).

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(2b)

TWO TYPES OF REGISTER

Pick two

(1) – memory address register(Mar)

(2) – program counter

(3) – Accumulator Register(AC)

(4) – Memory data Register(MDR)

(2C)

3 functions of Register

(i) – Register are used to quickly accept , store and transfer data and instructions that are being used immediately by the CPU

(ii) – Register is used for storing the results that are produced by the system

(iii) – MDR is the register of a computer’s control unit that contains the data to be stored in the computer storage or the data after a fetch from the computer storage

(2d)

(i) – Register are storage locations internal to the processor

While memory or Ram is located external to the CPU

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ii)General memory can be addressed on byte boundaries while Registes may not be able to access all the bytes in a register

iii)Register are temporary storage in the CPU that hold the data processor is currently working on

While Main memory(RAM)hold the program instructions and the data the program requires

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(4a)

A logic gate is an elementary building block of a digital circuit. Most logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels.

 (4b)

-AND

-OR

-NOT

-NAND

-NOR

-X NOR e.t.c

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5ai)

booting is the initialization of a computerized system.

5aii)

Cold booting: when the computer is started after having been switched off. While Warm booting: when the operating system alone is restarted (without being switched off) after a system crash or ‘freeze.’

5b)

A peripheral is an ancillary device used to put information into and get information out of the computer.”

5ci.

Keyboard

5cii.

Printer

5ciii.

Flash

5civ.

Processor

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