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1

The memory of a computer contains data and instructions in binary. The following instruction is stored in a location of the memory. Convert the instruction into hexadecimal. Explain why a programmer might prefer to read the instruction in hexadecimal rather than in binary. Give two other uses of hexadecimal. Use 1 Use 2

1. Data representation  →  1.1. Number systems

3. Hardware  →  3.1. Computer architecture

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2

Programmers can use a high-level language to write a computer program. Explain what is meant by the term ‘high-level language’. A program written in a high-level language is translated into machine code. This is so that it can be processed by a computer. Name one type of translator that can be used. Describe how your answer to part translates this program.

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

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3

Steffi has a number of files of different sizes that contain her work. Tick (3) to show whether each statement is true or false. Statement true (3) false (3) 47KB is larger than 10MB. 250bytes is smaller than 0.5MB. 50GB is larger than 100MB. 1TB is smaller than 4GB.

1. Data representation  →  1.3. Data storage and compression

7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving

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4

Five statements about serial half-duplex data transmission are shown in the table below. Tick (3) to show whether each statement is true or false. Statement true (3) false (3) Data is transmitted in one direction only, one bit at a time. Data is transmitted in both directions, multiple bits at a time. Data is transmitted in one direction only, multiple bits at a time. Data is transmitted in both directions, but only one direction at a time. Data is transmitted one bit at a time. Data is transmitted in both directions, but only one direction at a time. Data is transmitted multiple bits at a time.

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

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5

Parity checks are often used to detect errors that may occur during data transmission. The received bytes in the table below were transmitted using odd parity. Tick (3) to show whether each byte has been corrupted during transmission or not corrupted during transmission. Received byte corrupted during transmission (3) not corrupted during transmission (3) Another method of error detection is Automatic Repeat reQuest (ARQ). Explain how ARQ is used in error detection.

2. Data transmission  →  2.2. Methods of error detection

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6

Signals are sent to and from the components of a processor using buses. Identify and describe the purpose of two different buses. Bus 1 Purpose Bus 2 Purpose

3. Hardware  →  3.1. Computer architecture

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7

Six security terms and six statements are listed below. Draw a line to match the security term with the most appropriate statement. Scrambles data for secure transmission. Provides a secure connection between web browsers and websites allowing secure transmission of private data. Encryption Statement Security term Computer that acts as an intermediary between a web browser and the Internet. Legitimate-looking email is sent in the hope of gathering personal information; it requires the user to click on a link in the email. Uses rules and criteria, set by the user, to help protect a network or system from unauthorised access. Malicious code installed on the hard drive of a user’s computer; this code will redirect the user to a fake website without the user’s knowledge. Secure Socket Layer (SSL) Pharming Phishing Firewall Proxy server

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

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

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8

Complete the paragraph by choosing six correct terms from the list. • Optical • On-line • RAM • HDD • Primary • SSD • Secondary • ROM • Off-line A computer has two different types of memory. memory is not directly accessed by the CPU, but it allows a user to store data that can easily be accessed by applications. Two examples of this type of memory are and . The second type of memory is memory. This memory is directly accessed by the CPU. It allows the processor to access data and instructions that are stored in this memory. Two examples of this memory are and .

3. Hardware  →  3.3. Data storage

3. Hardware  →  3.1. Computer architecture

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9

A supermarket has a system that allows customers to check out their own shopping. Identify and describe the purpose of two input devices and one output device used in this system. Input device 1 Purpose Input device 2 Purpose Output device 1 Purpose

3. Hardware  →  3.2. Input and output devices

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10

Complete the truth table for the NOR gate. A B X A B Output (0 Write a logic statement that corresponds with the following logic circuit. A B C X X =

10. Boolean logic  →  10. Boolean logic

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11

State three functions provided by an operating system. Function 1 Function 2 Function 3

4. Software  →  4.1. Types of software and interrupts

8. Programming  →  8.1. Programming concepts

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12

The processes in a chemical factory are monitored by sensors connected to a microprocessor. Identify two different sensors used in this application. Give an example of how each sensor could be used in the chemical factory. Sensor 1 Use Sensor 2 Use Describe how the sensors and a microprocessor are used to monitor a process.

3. Hardware  →  3.2. Input and output devices

6. Automated and emerging technologies  →  6.1. Automated systems

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13

Gurdeep wants to send a large file to Jennifer over the Internet. State two benefits of compressing the file to send it. Benefit 1 Benefit 2 Two types of compression are lossy and lossless. Choose the most suitable type of compression for the following and explain your choice. Downloading the code for a computer program: Type of compression Explanation Streaming a video file: Type of compression Explanation

1. Data representation  →  1.3. Data storage and compression

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