Difficult Question Paper Questions and Answers
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Describe what an embedded operating system is. [3]
-A computer system that is built within a larger mechanical system and is designed to perform a dedicated function [1] -Low level operating system [1] -Has simple/ no user interface [1] -Optimised to reduce response times specifically for the task the device was created for [1]
Explain why the hexadecimal number system is used and state an example of its use. [3]
-Hexadecimal is easier to read for humans [1] -Hexadecimal uses fewer digits to represent a number than binary… [1] -…therefore is less likely to have input errors [1] Example of use: -tTo represent MAC addresses [1]
Explain how bitmap images are stored by a computer. [4]
-Image is made up of pixels [1] -Each pixel is given a binary code [1] -…which presents the colour of that pixel [1] -metadata is stored with the image [1]
Describe how an analogue sound wave is converted into digital form.
-(analogue) sound waves is sampled [1] -..amplitude of wave is measured [1] -…at regular time intervals [1] -each sample is stored as a binary number [1]
Compare the advantages and disadvantages of using virtual memory. [4]
-Virtual memory allows the user to run/have more applications open concurrently[1] -Virtual memory allows a device to operate as if it has more RAM than is physically installed[1] -user does not have to buy more RAM[1] -Takes time to swap files from virtual memory back into RAM[1] -It can make applications run more slowly[1]
It is better to install additional RAM to improve the performance of a computer instead of relying on virtual memory. Explain the purpose of virtual memory and justify why this statement is correct. [6]
-Virtual memory uses secondary storage as if it were RAM[1] -…to hold open more programs than physical RAM could hold open when RAM is FULL[1] -instructions / data that is not currently being used is moved to virtual memory to make space in RAM[1] -virtual memory can make the computer slower to respond when switching between applications[1] -more RAM will speed up access to data[1] -…leading to increased performance[1]