0478_s21_qp_12
A paper of Computer Science, 0478
Questions:
8
Year:
2021
Paper:
1
Variant:
2
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1
A denary value can be converted into hexadecimal and binary. Complete the table to show the hexadecimal and 8-bit binary values of the given denary values. Denary Hexadecimal 8-bit binary Working space Give two benefits, to users, of converting binary values to hexadecimal. Benefit 1 Benefit 2 Hexadecimal is used to represent Hypertext Markup Language (HTML) colour codes in computer science. Identify three other ways that hexadecimal is used in computer science.
1. Data representation  →  1.1. Number systems
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2
Data storage can be magnetic, solid state or optical. Six statements are given about data storage. Tick (3) to show if the statement applies to magnetic, solid state or optical storage. Some statements may apply to more than one type of storage. Statement Magnetic (3) Solid state (3) Optical (3) no moving parts are used to store data pits and lands are used to store data data is stored on platters flash memory is used to store data parts are rotated to store data data can be stored permanently Give one example of magnetic storage. Give one example of optical storage. Identify which type of storage would be the most suitable for use in a web server and justify your choice. Type of storage Justification Describe the operation of USB flash memory and how it stores data.
3. Hardware  →  3.3. Data storage
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3
Consider the logic statement: X = ((((NOT A AND B) OR C) AND B) NOR (B OR C)) Draw a logic circuit to represent the given logic statement. Do not attempt to simplify the statement. All logic gates must have a maximum of two inputs. X B A C Consider the completed truth table for the given logic statement. Row number A B C Working space X There are four errors in the truth table in the output (column. Identify the four incorrect outputs. Write the row number to identify each incorrect output. Row Row Row Row
10. Boolean logic  →  10. Boolean logic
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4
Three types of Internet security risk are virus, spyware and denial of service (DoS) attack. Six statements are given about Internet security risks. Tick (3) to show whether the statement applies to virus, spyware or denial of service. Some statements may apply to more than one Internet security risk. Statement Virus (3) Spyware (3) Denial of service (3) captures all data entered using a keyboard can be installed onto a web server prevents access to a website is malicious code on a computer is self-replicating damages the files on a user’s hard drive Identify three other types of Internet security risks. Some Internet security risks can maliciously damage data. Data can also be damaged accidentally. State three ways that data could be accidentally damaged.
5. The internet and its uses  →  5.3. Cyber security
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5
A security light system is used by a factory. The light only comes on when it is dark and when movement is detected. The light will stay on for 1 minute before switching off. Sensors and a microprocessor are used to control the security light system. Identify two sensors that would be used in the security light system. Sensor 1 Sensor 2 Describe how the sensors and the microprocessor control the security light system.
6. Automated and emerging technologies  →  6.1. Automated systems
3. Hardware  →  3.2. Input and output devices
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8
A keyboard is a type of input device that can be used to enter data into a computer. Complete the paragraph that describes one method of operation for a keyboard, using the most appropriate terms from the given list. Not all terms in the list need to be used. • Binary • Breaks • Calculated • Character • Circuit • Current • Information • Network • Press • Processor • Signal • Switch A keyboard has a key matrix underneath the keys. When a key is pressed, it presses a that completes a . This allows to flow. The location of the key pressed is . The location of the key pressed is compared to a map to find the value for the key that has been pressed.
3. Hardware  →  3.1. Computer architecture
3. Hardware  →  3.2. Input and output devices
9. Databases  →  9. Databases
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