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1

Greta has a computer that she uses for schoolwork and leisure. The computer has the Media Access Control (MAC) address: 00:A0:C9:14:C8:29 Tick (3) to show whether the MAC address is initially assigned to the computer by the network, the manufacturer or the user. Tick (3) Network Manufacturer User The values in the MAC address are hexadecimal values. Convert the three given hexadecimal values into 8-bit binary. A0 C9 Working space Convert the two given hexadecimal values into denary. C8 Working space Greta stores data on several off-line storage devices, including an external hard disk drive (HDD), a USB flash memory drive and a compact disc (CD). Identify the type of storage for each device. External HDD USB flash memory drive CD Describe the operation of a HDD and how it stores data.

3. Hardware  →  3.3. Data storage

3. Hardware  →  3.4. Network hardware

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2

Jolene displays videos on her website. She uses lossy compression to reduce the file size of the videos. Describe how lossy compression reduces the file size of the videos. State two reasons why Jolene would use lossy rather than lossless compression for the videos. Reason 1 Reason 2

1. Data representation  →  1.3. Data storage and compression

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3

An optical mouse is a type of input device that can be used to input data into a computer system. Complete the paragraph about the operation of an optical mouse, using the most appropriate terms from the given list. Not all terms need to be used. • Ball • Battery • LCD • LED • Lens • Magnifies • Matrix • Microswitch • Photoelectric • Photographic • Reduces • USB An optical mouse shines an from the bottom of the mouse onto a surface. Light bounces straight back from the surface into a cell. This has a that the reflected light to allow detection of smaller movements. When a button on the mouse is clicked, a is pressed. A connection is used to carry the data to the computer. Identify two other input devices that can be used to enter data into a computer.

3. Hardware  →  3.2. Input and output devices

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4

Spencer finds out that his online music account has been accessed by an unauthorised person. He believes his personal details for the account were obtained using phishing. Explain how the personal details could have been obtained using phishing. Give two other Internet security risks that could have been used to obtain the personal details.

5. The internet and its uses  →  5.3. Cyber security

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5

Six statements are given about programming languages. Tick (3) to show whether each statement applies to high-level language, assembly language or machine code. Some statements may apply to more than one type of programming language. Statement High-level language (3) Assembly language (3) Machine code (3) it requires a translator to be processed by a computer it is an example of low-level language it uses mnemonics it uses English-like statements it can be used to directly manipulate hardware in the computer it is portable

4. Software  →  4.2. Types of programming language, translators and integrated development environments (IDEs)

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6

Four 7-bit binary values are transmitted from one computer to another. A parity bit is added to each binary value creating 8-bit binary values. All the binary values are transmitted and received correctly. Identify whether each 8-bit binary value has been sent using odd or even parity by writing odd or even in the type of parity column. 8-bit binary value Type of parity The 8-bit binary value 10110001 is transmitted and received as 10110010 A parity check does not identify any errors in the binary value received. State why the parity check does not identify any errors. The data is sent using serial duplex data transmission. Describe how data is sent using serial duplex data transmission. State one drawback of using serial data transmission, rather than parallel data transmission.

1. Data representation  →  1.1. Number systems

2. Data transmission  →  2.2. Methods of error detection

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7

Marco uses his computer for work. The data he uses on a daily basis is valuable to his business. Marco is concerned about his data being accidentally damaged. Human error, such as incorrectly removing external storage devices, is one way that the data can be accidentally damaged. Identify two other ways that data can be accidentally damaged. Removing storage devices correctly from the computer can help prevent data being accidentally damaged. Give two other ways that accidental damage to data can be prevented.

3. Hardware  →  3.3. Data storage

5. The internet and its uses  →  5.3. Cyber security

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8

Consider the following logic circuit: A B C X Two NOT gates are used in the given logic circuit. Identify three other logic gates that are used in the given logic circuit. Consider the completed truth table for the given logic circuit. Row number A B C Working space X There are four errors in the truth table in the output (column. Identify the four incorrect outputs. Write the row number to identify each incorrect output. Row Row Row Row

10. Boolean logic  →  10. Boolean logic

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9

An underground car park has a system that checks the height of vehicles. A vehicle can be no higher than 1.8 metres to enter the car park. The system also counts the number of vehicles that have entered the car park, so that it can display how many parking spaces are still available. Each parking space has a red and a green light above it. If a car is parked in the parking space only the red light is on, otherwise only the green light is on. Sensors and a microprocessor are used to control the system. Complete the table to identify a suitable sensor for each part of the system. Task Sensor check if a vehicle is too high count the vehicles entering the car park check if a vehicle is parked in a parking space Describe how the sensor and the microprocessor are used to display the red or green light above the parking space.

3. Hardware  →  3.2. Input and output devices

6. Automated and emerging technologies  →  6.1. Automated systems

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10

Several components are involved in processing an instruction in a Von Neumann model for a computer system. Three of these components are the arithmetic logic unit (ALU), control unit (CU) and random access memory (RAM). Six statements are given about the components. Tick (3) to show if each statement applies to the ALU, CU or the RAM. Some statements may apply to more than one component. Statement ALU (3) CU (3) RAM (3) stores data and instructions before they enter the central processing unit (CPU) contains a register called the accumulator manages the transmission of data and instructions to the correct components contained within the CPU uses the data bus to send data into or out of the CPU carries out calculations on data The accumulator is a register that is part of the Von Neumann model. Give two other registers that are part of the Von Neumann model.

3. Hardware  →  3.1. Computer architecture

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