0478_s19_qp_11
A paper of Computer Science, 0478
Questions:
8
Year:
2019
Paper:
1
Variant:
1
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2
Rajesh creates a logic circuit. He uses three different logic gates in his circuit. Each logic gate has a maximum of two inputs. He describes the logic of each gate. “The only time the output will be 1 is when both inputs are 1.” State the single logic gate Draw the single logic gate: “The only time the output will be 1 is when both inputs are 0.” State the single logic gate Draw the single logic gate: “The only time the output will be 0 is when both inputs are 1.” State the single logic gate Draw the single logic gate:
10. Boolean logic  →  10. Boolean logic
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3
Five descriptions of different input or output devices are given in the table. Complete the table by stating the name of each input or output device. Description Name of device This is an input device that works by shining a light onto the surface of a document. The light source is automatically moved across the document and the reflected light is captured by mirrors and lenses. This is an input device where a laser or a light source is moved across an object. The width, height and depth of the object are measured to allow a model to be created. This is a large input device that is usually fixed to a wall. A user can calibrate the device to make sure the sensors align with a projected image. The user can use either their finger or a special pen to make selections. This is an output device that uses many small mirrors to reflect light towards a lens. This will display an image. This is an output device that creates an object by building layer upon layer of material.
3. Hardware  →  3.2. Input and output devices
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4
Lola is concerned about the risks to her computer when using the Internet. She wants to use some security methods to help protect her computer from the risks. Identify a security method she could use for each of the following risks. Each security method must be different. Describe how each security method will help protect Lola’s computer. Computer virus Security method Description Hacking Security method Description Spyware Security method Description Lola is also concerned that the data she stores could be subject to accidental damage or accidental loss. State three ways that the data Lola stores could be accidentally damaged or accidentally lost. Give two methods that Lola could use to help keep her data safe from accidental damage or accidental loss.
5. The internet and its uses  →  5.3. Cyber security
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6
A law company holds a lot of sensitive data about its clients. It currently requires employees to enter a username and a password to log-in to an account. Each password must be 8 letters. The company wants to increase the security of the log-in system. Identify two improvements the company could use to make the log-in system more secure. Explain how each improvement increases security. Improvement 1 Explanation Improvement 2 Explanation The law company wants to purchase a new file server. The company can purchase a server with either solid state storage or magnetic storage. After discussion, it decides to purchase a file server with magnetic storage. Explain why the company chose magnetic storage rather than solid state storage. The law company also uses optical storage. Give three different examples of optical storage.
3. Hardware  →  3.3. Data storage
5. The internet and its uses  →  5.3. Cyber security
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7
Annie writes a paragraph of text as an answer to an examination question about programming languages. Using the list given, complete Annie’s answer by inserting the correct six missing terms. Not all terms will be used. • Assembly • Converter • Denary • Hexadecimal • High-level language • Low-level language • Machine Code • Source Code • Syntax • Translator The structure of language statements in a computer program is called the . A programming language that uses natural language statements is called a . When programs are written in this type of language they need a to convert them into . A programming language that is written using mnemonic codes is called a . An example of this type of language is language.
4. Software  →  4.2. Types of programming language, translators and integrated development environments (IDEs)
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8
An art gallery has a website that is used to display and sell art. The gallery uses Secure Socket Layer (SSL) to provide a secure connection when selling art. Describe the process of SSL and how it provides a secure connection. The art gallery also uses a firewall. Six statements are given about firewalls. Tick (3) to show if the statement is True or False. Statement True (3) False (3) Firewalls are only available as hardware devices Firewalls allow a user to set rules for network traffic Firewalls will automatically stop all malicious traffic Firewalls only examine traffic entering a network Firewalls encrypt all data that is transmitted around a network Firewalls can be used to block access to certain websites The art gallery is concerned about computer ethics relating to its website. Explain what is meant by computer ethics and why the art gallery is concerned about computer ethics.
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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