2210_w21_qp_12
A paper of Computer Science, 2210
Questions:
11
Year:
2021
Paper:
1
Variant:
2
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1
Denary is a number system that is used by programmers. Tick (✓) one box to show whether denary is a base-2, base-10 or base-16 number system. Tick (✓) Base-2 Base-10 Base-16 Hexadecimal values can be used to represent denary values. Convert these four hexadecimal values into denary values. 1A AB Working space Hexadecimal values can also be converted to binary values. Tick (✓) one box to show the correct 8-bit binary value for each hexadecimal value. Hexadecimal value 25 Tick (✓) Hexadecimal value 1B Tick (✓) Give one way that hexadecimal is used in website development. Give one way that hexadecimal is used in low-level programming.
1. Data representation  →  1.1. Number systems
Open
2
A train company wants to install a self-service ticket machine system for its train stations. When the customer has purchased their tickets, the machine will provide a paper ticket. One output device that is used in the ticket machine is a display screen. Identify one other output device that is used in the ticket machine system. The train company does not want users to use a keyboard or a mouse to enter their data, when buying a ticket. The company is worried that they may be stolen or get too dirty. Identify one other input device that would be suitable for use in the ticket machine system, to allow users to enter their data.
3. Hardware  →  3.2. Input and output devices
Open
3
Six statements are given about methods of data transmission. Tick (✓) to show if each statement applies to serial simplex, parallel simplex, parallel half-duplex or serial duplex data transmission. Some statements may apply to more than one data transmission method. Statement Serial simplex (✓) Parallel simplex (✓) Parallel half-duplex (✓) Serial duplex (✓) bits are transmitted along a single wire data is transmitted in both directions it is only suitable for distances less than 5 metres bits from the same byte are transmitted one after the other data may not arrive in the correct sequence data is transmitted in both directions, but only one direction at a time A Universal Serial Bus (USB) connection can be used to transmit data from a mobile device to a computer. Give three benefits of using a USB connection for this purpose. Benefit 1 Benefit 2 Benefit 3
2. Data transmission  →  2.1. Types and methods of data transmission
Open
4
The paragraph explains the operation of different touch screen technologies. Complete the paragraph using the list of terms. Not all terms in the list need to be used. • capacitive • change • circuit • conductive • coordinates • grid • heat • infra-red • insulating • light • manufacture • pressure • resistive In touch screen technology, an electrostatic field is present on the surface of the touch screen. The properties of a user cause a in the field. The of the user’s touch can be calculated. In touch screen technology, a user pushes the top layer of the screen and makes it connect with the bottom layer to complete a . This type of touch screen is cheaper to .
3. Hardware  →  3.2. Input and output devices
2. Data transmission  →  2.1. Types and methods of data transmission
Open
5
Sammi works for a finance company and has a laptop that he uses for his work. He has confidential data about his customers stored on his laptop. Sammi does not connect the laptop to any networks. Sammi is concerned about his customers’ confidential data being viewed by other people in his office. One method he uses to prevent others viewing the data is encryption. Identify three other methods Sammi could use to prevent his customers’ confidential data being viewed. Sammi creates videos for the finance company website that give customers advice about their finances. He uses lossy compression to reduce the file size of the videos for the website. Give three ways that lossy compression can reduce the file size of the videos. Give one drawback of using lossy compression to reduce the file size of the videos. Sammi could have used lossless compression to compress the videos for the website. Give one reason why he would use lossless compression, rather than lossy compression, for the videos. Give two disadvantages of Sammi using lossless compression, rather than lossy compression, for the videos. Disadvantage 1 Disadvantage 2
1. Data representation  →  1.3. Data storage and compression
Open
7
Five statements are given about devices. Tick (✓) to show if each statement applies to a 3D scanner, barcode reader or a Quick Response (QR) code reader. Some statements may apply to more than one type of device. Statement 3D scanner (✓) Barcode reader (✓) QR code reader (✓) uses position and alignment markers for orientation when scanning scans the shape and appearance of an object uses reflected light from a laser to convert a black-and-white pattern into binary can often be built into an Electronic Point Of Sale (EPOS) terminal, for example, a supermarket checkout it is an example of an input device
3. Hardware  →  3.2. Input and output devices
Open
8
An electronic game has three square mats that are coloured red, green and blue. The player will see a colour displayed on a screen and has 1 second to hit the mat that matches the colour. If the player hits the correct mat, within 1 second, a counter is incremented. When a player hits an incorrect mat, the game ends. The game uses sensors and a microprocessor to determine if the player hits the correct mat within 1 second. Explain how the game uses sensors and a microprocessor to count the number of times a player hits a correct mat within 1 second.
1. Data representation  →  1.2. Text, sound and images
1. Data representation  →  1.1. Number systems
6. Automated and emerging technologies  →  6.3. Artificial intelligence
Open
10
Jermain uses the Secure Socket Layer (SSL) protocol for secure transmission when sending data using the internet. Explain how the SSL protocol secures the data for transmission. Identify an alternative protocol that could be used for secure transmission of data using the internet. Give two ways that a user can identify if a website uses secure data transmission.
5. The internet and its uses  →  5.1. The internet and the world wide web
2. Data transmission  →  2.1. Types and methods of data transmission
Open