0478_w19_qp_13
A paper of Computer Science, 0478
Questions:
8
Year:
2019
Paper:
1
Variant:
3
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1
A library has a system that allows customers to check out the books that they want to borrow. Each book has a barcode that can be used to identify the book. Identify two input devices that may be used in the library’s system. Input device 1 Input device 2 Identify two storage devices that may be used in the library’s system. Storage device 1 Storage device 2 Identify two output devices that may be used in the library’s system. Output device 1 Output device 2 The data stored by the library is archived at the end of each day. The archive is held on a server in the library office. The data is encrypted with an 8-bit key. As some of the data is confidential, the library wants to make the encryption more secure. State how the library could make the encryption more secure. The term used to describe data before it is encrypted is plain text. State the term used to describe encrypted data. The library’s archive system uses an error detection and correction system that combines a parity check with an automatic repeat request (ARQ). Describe how this system uses the parity check and ARQ. The library has a website that customers can use to search for a book. The website has a background colour with the hexadecimal colour code #F92A10 The colour code is stored in two 12-bit binary registers. Show how the colour code would be stored in the registers. F92 A10 Videos on the library website show customers which books the library will soon have in stock. The library wants the file size of a video to be as small as possible. Identify and describe a method the library could use to reduce the file size of a video as much as possible. The library often holds events that introduce new authors. At the events, the library has a Liquid Crystal Display (LCD) screen that displays data, including an image and information about the author. Describe how an LCD screen operates to display this data.
2. Data transmission  →  2.3. Encryption
1. Data representation  →  1.3. Data storage and compression
Open
2
A programmer uses a high-level language to write a computer program. Four statements are given about high-level programming languages. Tick (3) to show if each statement is True or False. Statement True (3) False (3) High-level languages need to be translated into machine code to run on a computer High-level languages are written using mnemonic codes High-level languages are specific to the computer’s hardware High-level languages are portable languages Tick (3) to show which of the following is an example of a high-level language program. Example program Tick (3) INP STA ONE INP STA TWO ADD ONE a = input() b = input() if a == b: print("Correct") else: print("Incorrect")
4. Software  →  4.2. Types of programming language, translators and integrated development environments (IDEs)
Open
3
Blair writes a paragraph about data transmission in her Computer Science examination. Use the list given to complete Blair’s paragraph by inserting the correct five missing terms. Not all terms will be used. Terms can be used more than once. • duplex • half-duplex • parallel • serial • simplex data transmission is when data is transmitted a single bit at a time. data transmission is when multiple bits of data are sent all at once. If a user wants to transmit data over a long distance, with the highest chance of accuracy, data transmission should be used. If data needs to be transmitted in one direction only, for example from a computer to a printer, data transmission should be used. If a user has a large amount of data to transmit and this needs to be done as quickly as possible data transmission should be used.
2. Data transmission  →  2.1. Types and methods of data transmission
Open
4
A factory that manufactures cleaning products has a system that monitors conditions throughout the manufacturing process. The inputs to the system are: Input Binary value Condition A pH > 7 pH = 35 °C P Pressure > = 80 % Pressure = 80 % and the temperature > = 35 °C or • The temperature 7 Draw a logic circuit to represent the alarm system in the factory. Each logic gate must have a maximum of two inputs. A T X P Complete the truth table for the given logic problem. A T P Working space X A sensor and a microprocessor are used to monitor the pH of the cleaning products. The system records each reading that is taken. If the reading is greater than 7 a warning message is displayed on a monitor. Explain how the sensor and microprocessor are used in the system.
10. Boolean logic  →  10. Boolean logic
Open
6
Jesse is taking his Computer Science examination. He answers five questions about ethics. For the first question, he writes the answer: “This type of software can be copied and shared without the permission of the owner.” State what Jesse is describing. For the second question, he writes the answer: “With this type of software, the owner still retains the copyright for the software, but he gives away copies of it for free.” State what Jesse is describing. For the third question, he writes the answer: “This type of software is often a trial version of the full software. To use the full version the user normally needs to pay a fee.” State what Jesse is describing. For the fourth question, he writes the answer: “This is when a person copies another person’s computer program and tries to claim it as his own.” State what Jesse is describing. For the fifth question, he writes the answer: “This is the legal protection that a person can obtain, to provide protection against his work being stolen.” State what Jesse is describing.
6. Automated and emerging technologies  →  6.3. Artificial intelligence
8. Programming  →  8.3. File handling
5. The internet and its uses  →  5.3. Cyber security
Open
7
The Von Neumann model for a computer system has several components that are used in the fetch-execute cycle. One component is main memory. Describe what is meant by main memory and how it is used in the Von Neumann model for a computer system. State two other components in the Von Neumann model for a computer system. Computer systems often use interrupts. Five statements are given about interrupts. Tick (3) to show if each statement is True or False. Statement True (3) False (3) Interrupts can be hardware based or software based Interrupts are handled by the operating system Interrupts allow a computer to multitask Interrupts work out which program to give priority to Interrupts are vital to a computer and it cannot function without them
4. Software  →  4.1. Types of software and interrupts
3. Hardware  →  3.1. Computer architecture
Open