0478_w19_qp_11
A paper of Computer Science, 0478
Questions:
9
Year:
2019
Paper:
1
Variant:
1
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1
Andrew wants to produce advertising material for his company. Andrew can use an Inkjet printer or a Laser printer. Draw lines to connect each printer to a correct statement. More than one line may be used to connect to each printer or statement. Printer Statement Uses a charged drum to create the printed item Can print in colour Uses powdered toner Creates output line by line using a print head Inkjet printer Laser printer Andrew wants to print a single page A4 leaflet. He wants to print 10 000 copies. State whether he should use an inkjet or a laser printer. Andrew wants to produce small 3D models of the company logo. Explain how a 3D cutter could be used to produce the models.
3. Hardware  →  3.2. Input and output devices
6. Automated and emerging technologies  →  6.1. Automated systems
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3
A company has several offices. It uses the Internet to transfer data between offices. The company also makes payments to staff and suppliers using online banking. The company are concerned about spyware and other security aspects of using the Internet. Explain what is meant by spyware and how it is used to obtain data. The company uses a web page to log on to the online bank. Identify one method that could be used by the online bank to reduce the impact of spyware when logging on. State how the method prevents the use of spyware. The company has installed a firewall as part of its data security. Describe how a firewall can help protect against unauthorised access to data. State two other methods the company could use to help prevent unauthorised access to data. Method 1 Method 2
5. The internet and its uses  →  5.3. Cyber security
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4
A zoo has an information point. • Visitors use a menu to select information about animals. • The menu includes 500 different animals. • The information is provided only using high definition video with an audio track. State one input device that could be used for the information point. The output is shown on a monitor. State one other output device that could be used for the information point. The video files are stored at the information point. State one secondary storage device that could be used. The zoo decides to introduce Quick Response codes in different places in the zoo. These provide further information about the animals. Describe how customers obtain the information from the Quick Response codes.
3. Hardware  →  3.2. Input and output devices
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5
Sonia shares files with her friends. The method of data transmission she uses is half-duplex serial transmission. Describe how data is transmitted using half-duplex serial data transmission. The system uses parity bits to check for errors during data transmission. The outcome of four bytes after transmission is: Byte 1 Byte 2 Byte 3 Byte 4 One of the bytes has been transmitted incorrectly. Identify the byte that was transmitted incorrectly. Byte Explain how you identified the byte that was transmitted incorrectly.
2. Data transmission  →  2.1. Types and methods of data transmission
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6
Ishan is a member of a software community that develops computer games. He has programmed a new feature for one of the community’s existing games. Ishan compiles the program before he issues it to the community. Explain one benefit of Ishan compiling the program. Explain one drawback of Ishan compiling the program. Ishan shares the program with community members over the Internet, using Secure Socket Layer (SSL). Explain how Ishan will know he is on a secure website. Describe how an SSL connection is established. The community publishes completed games on the Internet as freeware. Describe what is meant by freeware. The program files for the games are compressed before they are published on the Internet. Describe one benefit of compressing the program files. State whether lossy or lossless compression should be used.
1. Data representation  →  1.3. Data storage and compression
8. Programming  →  8.3. File handling
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7
A factory manufactures plastic pipes. It uses logic circuits to control the manufacturing process. Consider the logic gate: Input A Input B Output Complete the truth table for this logic gate. Input A Input B Output Consider the truth table: Input A Input B Output State the single logic gate that produces the given output. Plastic pipes of various sizes are manufactured by heating the plastic and using pressure. The manufacturing system uses sensors to measure the pressure (P), temperature (T) and speed (S) of production. The inputs to the manufacturing system are: Input Binary value Condition P pressure is > 5 bar pressure is 200 degrees Celsius temperature is 1 metre per second speed is 200 degrees Celsius and the pressure is 1 metre per second and Temperature is
10. Boolean logic  →  10. Boolean logic
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9
HTML can be used to create the structure and the presentation of web pages. Describe what is meant by HTML structure. Gloria writes a paragraph as an answer to an examination question about accessing a website. Use the list given to complete Gloria’s answer by inserting the correct four missing terms. Not all terms will be used. • browser • cookies • Hypertext Markup Language (HTML) • hypertext transfer protocol • hypertext transfer protocol secure • Internet Protocol address (IP address) • Media Access Control address (MAC address) • web server The user enters the URL of the website. The uses the DNS server to look up the of the website. The browser sends a request to the to obtain the website files. The website files are sent as that is interpreted by the browser.
5. The internet and its uses  →  5.1. The internet and the world wide web
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