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1

Computer memory size is measured in multiples of bytes. Four statements about computer memory sizes are given in the table. Tick (✓) to show if the statement is True or False. Statement True (✓) False (✓) 25 kB is larger than 100 MB 999 MB is larger than 50 GB 3500 kB is smaller than 2 GB 2350 bytes is smaller than 2 kB

3. Hardware  →  3.3. Data storage

1. Data representation  →  1.3. Data storage and compression

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2

The Von Neumann model for a computer system uses several components in the fetch-execute cycle. One component that is used is the Control Unit (CU). Identify four other components that are used in the Von Neumann model for a computer system.

3. Hardware  →  3.1. Computer architecture

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3

The data from a sensor must be converted from analogue to digital to be processed by a computer. State what is meant by analogue data. State what is meant by digital data.

3. Hardware  →  3.2. Input and output devices

2. Data transmission  →  2.1. Types and methods of data transmission

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4

An 8-bit binary register contains the value: Convert the binary value to denary. The contents of the register shifted one place to the right would give the result: The contents of the register shown at the start of question 4 are shifted two places to the left. Show the contents of the register after this shift has taken place. State the effect this shift has on the denary value in part .

1. Data representation  →  1.1. Number systems

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5

Audrey wants to send a sound file to Nico using email. The file is too large to attach to an email so Audrey decides to compress the file. She uses lossy compression to reduce the size of the sound file. Describe how lossy compression reduces the size of the sound file. Nico asks Audrey why she used lossy compression rather than lossless. State one advantage Audrey could give of using lossy rather than lossless to compress the sound file. State one disadvantage Nico could give of using lossy rather than lossless to compress the sound file. Audrey sometimes records MIDI files. Explain what is meant by a MIDI file. MIDI uses serial data transmission. Explain two advantages of using serial transmission rather than parallel transmission. Advantage 1 Advantage 2

1. Data representation  →  1.3. Data storage and compression

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6

Touch screen technologies can be described as resistive or capacitive. Six statements are given about resistive and capacitive technology. Tick (✓) to show if the statement applies to Resistive or Capacitive technology. Statement Resistive (✓) Capacitive (✓) This touch screen has multi-touch capabilities This touch screen cannot be used whilst wearing gloves This touch screen is made up of two layers with a small space in between This touch screen uses the electrical properties of the human body This touch screen is normally cheaper to manufacture This touch screen has a quicker response time

3. Hardware  →  3.2. Input and output devices

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7

Gerald uses a keyboard to enter a website address into the address bar of his browser. Describe how Gerald’s key presses on his keyboard are processed by the computer. State three functions of a browser. The website Gerald visits uses https. Explain what is meant by https.

5. The internet and its uses  →  5.1. The internet and the world wide web

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8

Consider the logic circuit: A B C X Write a logic statement to match the given logic circuit. Complete the truth table for the given logic circuit. A B C Working space X

10. Boolean logic  →  10. Boolean logic

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9

Maisey purchases a new router and attaches it to her computer. The connection she sets up uses duplex data transmission. Five statements are given about duplex data transmission. Tick (✓) to show if the statement is True or False. Statement True (✓) False (✓) Duplex data transmission can be either serial or parallel Duplex data transmission is when data is transmitted both ways, but only one way at a time Duplex data transmission is always used to connect a device to a computer Duplex data transmission is when data is transmitted both ways at the same time Duplex data transmission automatically detects any errors in data Maisey’s computer uses an integrated circuit (IC) for data transmission that sends multiple bits at the same time. State whether the IC uses serial or parallel data transmission. Maisey purchases a new printer and connects it to her computer using the USB port. Explain two benefits of using a USB connection. Benefit 1 Benefit 2

2. Data transmission  →  2.1. Types and methods of data transmission

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10

Data is valuable to a company. Companies use error detection methods to make sure that data is accurate. One error detection method is the use of a check digit. Explain what is meant by a check digit and how it is used to detect errors. Companies can use a range of security methods to keep their data secure. Identify two security methods that a company can use to keep their data secure and explain how each method can keep the data secure. Security method 1 Security method 2

2. Data transmission  →  2.2. Methods of error detection

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

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11

Robert has a mobile device that uses RAM, ROM and an SSD. State what the RAM, ROM and SSD are used for. RAM ROM SSD Give two reasons why an SSD, rather than a HDD, is used in the mobile device. Reason 1 Reason 2

3. Hardware  →  3.3. Data storage

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