WAEC 2018 COMPUTER SCIENCE ESSAY AND OBJECTIVE ANSWERS – MAY/JUNE – wakagist.com

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(1ai)
Computer system is the complete computer made up of the CPU, memory and related electronics (main cabinet), all the peripheral devices connected to it and its operating system.

(1aii)
(i) Input Devices eg: keyboard, mouse
(ii) Output Devices eg: monitor, speakers
(iii) Secondary Storage Devices eg: hard disk drive, CD/DVD drive
(iv) Processor eg: CPU
(v) Primary Storage Devices eg: RAM

(1bi)
(i) Collection
(ii) Conversion

(1bii)
(i) EDSAC: Electronic Delay Storage Automatic Calculator
(ii) EDVAC: Electronic Discrete Variable Automatic Computer

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(2a) Register is used to quickly accept, store, and transfer data and instructions that are being used immediately by the CPU.

(2b)
(i) Memory Address Register(MAR)
(ii) Accumulator Register(AC)
(iii) Memory data Register(MDR)

(2c)
(i) Register also provides a means to access counters for profiling system performance.
(ii)Register is used for storing the results that are produced by the system
(iii) MAR holds the memory location of data that needs to be accessed.

(2d)
(i) Registers are temporary storage in the CPU that holds the data the processor is currently working on, while Main memory holds the program instructions and the data the program requires.
(ii) Main memory can be addressed on a byte boundaries, where Registers may not be able to access all the bytes in a register.
(iii) Registers are the fastest memory in a computer while Main memory is the slowest still-fast memory in a computer.
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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.

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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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