0478_s18_qp_11
A paper of Computer Science, 0478
Questions:
10
Year:
2018
Paper:
1
Variant:
1
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1
Jane answers an examination question about computers and data correctly. Six different words or numbers have been removed from her answer. Complete the sentences in Jane’s answer, using the list given. Not all items in the list need to be used. • • • • analogue • binary • denary • digital • hexadecimal As humans, we process …………………………………… data, but a computer cannot process this type of data. For a computer to be able to process data it needs to be converted to …………………………………… data. As humans, we mostly use a …………………………………… number system; this is a base …………………………………… number system. Computers use a …………………………………… number system; this is a base …………………………………… number system.
1. Data representation  →  1.1. Number systems
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3
The three binary numbers in the registers A, B and C have been transmitted from one computer to another. Parity bit Register A Register B Register C One binary number has been transmitted incorrectly. This is identified through the use of a parity bit. Identify which register contains the binary number that has been transmitted incorrectly. Explain the reason for your choice. The binary number that has been transmitted incorrectly is in Register Explanation
1. Data representation  →  1.1. Number systems
2. Data transmission  →  2.2. Methods of error detection
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5
Six components of the Von Neumann model for a computer system and six descriptions are given. Draw a line to match each component to the most suitable description. Component Immediate access store (IAS) Register Accumulator (ACC) Bus Control unit (CU) Arithmetic logic unit (ALU) Description Holds data and instructions when they are loaded from main memory and are waiting to be processed. Holds data temporarily that is currently being used in a calculation. Manages the flow of data and interaction between the components of the processor. Pathway for transmitting data and instructions. Holds data or instructions temporarily when they are being processed. Carries out the calculations on data.
3. Hardware  →  3.1. Computer architecture
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8
A supermarket uses a barcode scanner to read the barcodes on its products. Describe how the barcode scanner reads the barcode. Explain how the barcode system could help the supermarket manage its stock. An infrared touch screen is used to view and navigate the supermarket stock system. Explain how the infrared touch screen detects a user’s touch. The supermarket uses secondary storage and off-line storage to store data about its stock. Explain what is meant by secondary storage and off-line storage. Secondary storage Off-line storage
3. Hardware  →  3.3. Data storage
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10
RockICT is a music business that has a website to allow customers to view and buy the products it sells. The website consists of web pages. Describe what is meant by HTML structure and presentation for a web page. The URL for the music company’s website is: https://www.rockict.net/index.htm Part 2 Part 1 Identify what Part 1 and Part 2 represent in this URL. Part 1 Part 2 Describe what is meant by https. When a customer enters the website, a message is displayed: “RockICT makes use of cookies. By continuing to browse you are agreeing to our use of cookies.” Explain why the music company uses cookies. The music company is concerned about the security of its website. The company uses a proxy server as part of its security system. Describe the role of a proxy server in the security system.
5. The internet and its uses  →  5.1. The internet and the world wide web
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